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gipsy n00b
Joined: 16 Nov 2003 Posts: 3
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Posted: Mon Jan 26, 2004 9:36 pm Post subject: 2.6, promise pdc 20268 and dmsetup |
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I have a Promise 20268 with 2 80G Discs in a Stripe Set and searched the web over and over to find a solution to mount this set with kernel 2.6.1. Finally I stumbled over a post on the LKML which describes how to use dmsetup to create the device mapper device for accessing the Stripe Set. But now I'm stuck; All I can find is people telling, they managed to get it working, but nowhere they describe how they did it.
I've managed to create a device /dev/mapper/ataraid, which I can correctly fdisk:
Code: |
# fdisk /dev/mapper/ataraid
Command (m for help): p
Disk /dev/mapper/ataraid: 160.0 GB, 160052723712 bytes
255 heads, 63 sectors/track, 19458 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/mapper/ataraid1 1 19458 156296353+ 83 Linux
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This is exactly the same output like in 2.4 with the ataraid driver so it should be more or less correct, but now I don't know how to mount or mknod this /dev/mapper/ataraid1 because it's nonexistant.
Perhaps someone in here can help; I think it would also be interesting for a lot of other linux-users ... |
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okapi n00b
Joined: 11 Feb 2003 Posts: 42 Location: Bromont, Canada
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Posted: Wed Feb 04, 2004 9:30 pm Post subject: kernel 2.6 ATARAID |
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Can you post a little howto on the way you manage to get the device mapped. I found the same tread on LKML and I did not manage to map the device. _________________ -----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d++(-) s: a40 C+++>++++$ ULS++++$ P- L+++ E--- W+++ N+ o++ K? w---
!O M- V-- PS+ PE- Y+(++) PGP++>+++ t+ 5 X+++ R tv b+ DI++ D G e++ h--
r++ y+++
------END GEEK CODE BLOCK------ |
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vlad_tepes n00b
Joined: 27 Mar 2004 Posts: 10
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Posted: Sat Mar 27, 2004 10:09 pm Post subject: |
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I just managed to get my PDC20271 (TX2000) to work.
Here's what I have:
* 2.6.3-gentoo-r1
* Promise TX2000
* two 40GB HD's, one partition (NTFS, whole disk)
Here's what I did:
1) install pdc202xx_new kernel module
after modprobe'ing pdc202xx_new I have now
Code: | - /dev/hde (first disk of raid-array)
- /dev/hdg (second disk of raid-array)
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2) install device mapper
Code: | emerge device-mapper |
3) re-compile kernel with device-mapper support
checked options "Device Mapper support" and "ioctl interface v4" in
Device Drivers --> Multi-device support
4) create a device for the raid-array
First we need a mapping file for dmsetup:
Code: | echo 0 $(expr $(blockdev --getsize /dev/hde) '*' 2) striped 2 128 /dev/hde 0 /dev/hdg 0 > devmap.raid |
my RAID consists of two disk's (/dev/hde and /dev/hdg) and is a stripe.
the size of a chunk is 65KB -> 128 sectors. see "man dmsetup" for a description
of the mapping-file.
the file should look something like this:
Code: | 0 156330720 striped 2 128 /dev/hde 0 /dev/hdg 0 |
now create a device for the RAID
Code: | dmsetup create raid0 devmap.raid0 |
the new mapped device will be placed in /dev/mapper/raid0
5) create devices for the partitions
sfdisk gives us the details:
Code: | sfdisk -d /dev/mapper/raid0 |
should print something like this:
Code: | # partition table of /dev/mapper/raid0
unit: sectors
/dev/mapper/raid0p1 : start= 63, size=156328452, Id= 7, bootable
/dev/mapper/raid0p2 : start= 0, size= 0, Id= 0
/dev/mapper/raid0p3 : start= 0, size= 0, Id= 0
/dev/mapper/raid0p4 : start= 0, size= 0, Id= 0
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So create another mapping file for each partition, in my case this is just
one file (I named it devmap.raid0p1)
Code: | # start size type destination start
0 156328452 linear /dev/mapper/raid0 63
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'start' and 'size' should be the values from sfdisk above
...and create a device for this partition:
Code: | dmsetup create raid0p1 devmap.raid0p1 |
...and finally
Code: | mount -t ntfs /dev/mapper/raid0p1 /mnt/RAID0 |
hope that helps
-robert |
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gipsy n00b
Joined: 16 Nov 2003 Posts: 3
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Posted: Sat Mar 27, 2004 10:56 pm Post subject: Perfect !!! |
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this works like a charm ... very good work and thanks a lot.
I think this post should go somewhere into the faq or docs, because I think there are more then one interested in this solution. |
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tychop n00b
Joined: 20 Mar 2004 Posts: 8
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Posted: Sun Mar 28, 2004 12:24 am Post subject: |
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Just a Q:
What needs to be done to retain this info after booting?
Edit the fstab?
Or do I need to do more? |
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dotcom n00b
Joined: 17 Feb 2003 Posts: 20 Location: Sweden
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Posted: Sun Mar 28, 2004 8:46 am Post subject: |
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first - thanx for the info.
would this solution also work when trying to switch from a 2.4 kernel (with working ataraid (promise)) to a 2.6 kernel?
I might not have understood completely how this is can be done , but if anyone suceeded, please let me know.
thx a lot in advance! _________________ Man who walk through airport turnstile sideways going to Bangkok... |
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vlad_tepes n00b
Joined: 27 Mar 2004 Posts: 10
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Posted: Sun Mar 28, 2004 12:30 pm Post subject: |
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tychop wrote: | What needs to be done to retain this info after booting?
Edit the fstab?
Or do I need to do more? |
The first step I did was to add a script to /etc/init.d called ataraid0
which will create the mappings on boot.
Code: | #!/sbin/runscript
depend() {
need modules
}
start() {
ebegin "Initializing software mapped RAID devices"
/etc/stripemaps/stripe-mapper.sh /etc/stripemaps/*.devmap
eend $? "Error initializing software mapped RAID devices"
}
stop() {
ebegin "Removing software mapped RAID devices"
dmsetup remove_all
eend $? "Failed to remove software mapped RAID devices."
}
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this script assumes the mapping-files (*.devmap) and a script called
stripe-mapper.sh in /etc/stripemaps
Here is stripe-mapper.sh (please forgive my poor sh- and awk-knowledge...)
Code: | #!/bin/sh
SELF=`basename $0`
if [[ $# < 1 || $1 == "--help" ]]
then
echo usage: $SELF mapping-file
exit 1;
fi
# setup vars for mapping-file, device-name and devce-path
FNAME=$1
NAME=`basename $FNAME .devmap`
DEV=/dev/mapper/$NAME
# create device using device-mapper
dmsetup create $NAME $FNAME
if [[ ! -b $DEV ]]
then
echo $SELF: could not map device: $DEV
exit 1;
fi
# create a linear mapping for each partition
sfdisk -l -uS $DEV | awk '/^\// {
start = $3;size = $5;
if ( size == 0 ) next;
base = substr($1,0,length($1)-2);
part = substr($1,length($1)-1);
("basename " $1) | getline dev;
print 0, size, "linear", base, start | ("dmsetup create " dev); }'
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the script assumes mapping-files of the form device.devmap and
first creates a mapping for the whole disk: /dev/mapper/device
and a mapping for each partition: /dev/mapper/devicep1, /dev/mapper/devicep2, ...
then add the script to boot runlevel
Code: | rc-update add ataraid0 boot |
and test it:
Code: | /etc/init.d/ataraid0 start |
the devices for the partitions should be now in /dev/mapper
The second step is (as you mentioned) to edit fstab and append
a line for each partition on the disk, for example:
Code: | /dev/mapper/raid0p1 /mnt/RAID0 ntfs noatime,ro 0 0 |
WARNING: i haven't tested the scripts a lot before posting them here, especially with disks having more than one partition !
also putting scripts in /etc is not a good idea, maybe /bin or even /sbin would be better.
-robert |
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vlad_tepes n00b
Joined: 27 Mar 2004 Posts: 10
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Posted: Sun Mar 28, 2004 12:38 pm Post subject: |
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dotcom wrote: | first - thanx for the info.
would this solution also work when trying to switch from a 2.4 kernel (with working ataraid (promise)) to a 2.6 kernel?
I might not have understood completely how this is can be done , but if anyone suceeded, please let me know.
thx a lot in advance! |
I switched from 2.4 (SuSE) which detected my TX2000 without any problems to 2.6.3 gentoo. As i understand the device-mapper does much the same in 2.6 as ataraid did in 2.4 (except that it's now in user-mode I think) so There-Should-Be-No Problem(TM)
If you try to INSTALL gentoo on a IDE-RAID, that would be something different...
-robert |
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dotcom n00b
Joined: 17 Feb 2003 Posts: 20 Location: Sweden
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Posted: Sun Mar 28, 2004 7:36 pm Post subject: |
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Hi Robert,
thx again. I think I am getting closer to understand devicemapping.
Just one more question - how about grub/lilo boot/kernel parameters?
Would it look like...
Code: |
e.g. grub
boot hd(0,x)
kernel hd(0,x) /boot/bzImage.whatever root=/dev/mapper/raid0py
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...for a system booting from ataraid partitions? _________________ Man who walk through airport turnstile sideways going to Bangkok... |
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vlad_tepes n00b
Joined: 27 Mar 2004 Posts: 10
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Posted: Sun Mar 28, 2004 8:09 pm Post subject: |
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dotcom wrote: | Hi Robert,
thx again. I think I am getting closer to understand devicemapping.
Just one more question - how about grub/lilo boot/kernel parameters?
Would it look like...
Code: |
e.g. grub
boot hd(0,x)
kernel hd(0,x) /boot/bzImage.whatever root=/dev/mapper/raid0py
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...for a system booting from ataraid partitions? |
unfortunately not. booting from software-raids would need a little bit more magic (at leats from a raid0, raid1 should work though)
because the /dev/mapper/whatsoever device is created by the devicemapper (which is in or loaded by the kernel) its not accessible to grub.
grub knows something about the physical drives+partitions in the system (from the BIOS) and a few about filesystems but nothing of device-mapping I fear.
maybe using initrd (booting from a ramdisk) would be a solution here,
but I have no expirience with that
-robert |
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linux_on_the_brain Tux's lil' helper
Joined: 24 Feb 2004 Posts: 136
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Posted: Fri Apr 02, 2004 6:05 pm Post subject: |
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Quote: | So create another mapping file for each partition, in my case this is just
one file (I named it devmap.raid0p1)
Code:
# start size type destination start
0 156328452 linear /dev/mapper/raid0 63
'start' and 'size' should be the values from sfdisk above
...and create a device for this partition:
Code:
dmsetup create raid0p1 devmap.raid0p1
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Vlad_tepes, great work, I have one question what command are you using to create devmap.raid0p1. I created 2 partitions but I don't know what needs to passed to the dmsetup command to create the 2 additional devmap files.
here is my config
Code: | # partition table of /dev/mapper/raid0
unit: sectors
/dev/mapper/raid0p1 : start= 63, size=585954747, Id=83
/dev/mapper/raid0p2 : start=585954810, size=390829320, Id=83
/dev/mapper/raid0p3 : start= 0, size= 0, Id= 0
/dev/mapper/raid0p4 : start= 0, size= 0, Id= 0 |
thanks |
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linux_on_the_brain Tux's lil' helper
Joined: 24 Feb 2004 Posts: 136
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Posted: Fri Apr 02, 2004 8:46 pm Post subject: |
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OK, well I'm getting a little farther but I have hit road block, not sure where I went wrong, Would somebody fix me up. Thanks
Here is what I have done
Code: | sfdisk -d /dev/mapper/raid0
# partition table of /dev/mapper/raid0
unit: sectors
/dev/mapper/raid0p1 : start= 63, size=585954747, Id=83
/dev/mapper/raid0p2 : start=585954810, size=390829320, Id=83
/dev/mapper/raid0p3 : start= 0, size= 0, Id= 0
/dev/mapper/raid0p4 : start= 0, size= 0, Id= 0
digital_linux root # echo -ne '0 585954747 linear /dev/mapper/raid0 63' > devmap.raid0p1
digital_linux root # dmsetup create raid0p1 devmap.raid0p1
device-mapper ioctl cmd 3 failed: Device or resource busy
Command failed |
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Kileak n00b
Joined: 12 Jun 2003 Posts: 37 Location: Giessen, Germany
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Posted: Wed Apr 14, 2004 5:05 pm Post subject: |
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Well, at least this helped me a little more in getting my HPT370-Raid working with the 2.6 kernel... But still it doesn't work really
Everything worked and I can mount the raid-Partition. So I was quite happy to see it working, but then I looked into some directories, and besides the files which should be there, there were many trashy files (àla %$??ÄÄÄ"§.??? ), and of course I couldn't access any files...
I thought it might be that I've got a different cluster size (32KB), so I tried to change it in devmap.raid0 from 128 to 64, but then I couldn't even mount the partition...
Any ideas what it could be, or what else I could try? Would be very nice to get the raid working under 2.6, because 160GB of space more or less aren't something I would like to waste
Code: |
kileak raid # cat devmap.raid0
0 312736032 striped 2 128 /dev/hde 0 /dev/hdg 0
kileak raid # cat devmap.raid0p1
0 163846872 linear /dev/mapper/raid0 63
kileak raid # cat devmap.raid0p2
0 148874355 linear /dev/mapper/raid0 163846935
kileak raid # sfdisk -d /dev/mapper/raid0
# partition table of /dev/mapper/raid0
unit: sectors
/dev/mapper/raid0p1 : start= 63, size=163846872, Id= c
/dev/mapper/raid0p2 : start=163846935, size=148874355, Id= c
/dev/mapper/raid0p3 : start= 0, size= 0, Id= 0
/dev/mapper/raid0p4 : start= 0, size= 0, Id= 0
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vlad_tepes n00b
Joined: 27 Mar 2004 Posts: 10
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Posted: Thu Apr 15, 2004 8:48 pm Post subject: |
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Kileak wrote: | Well, at least this helped me a little more in getting my HPT370-Raid working with the 2.6 kernel... But still it doesn't work really
Everything worked and I can mount the raid-Partition. So I was quite happy to see it working, but then I looked into some directories, and besides the files which should be there, there were many trashy files (àla %$??ÄÄÄ"§.??? ), and of course I couldn't access any files...
I thought it might be that I've got a different cluster size (32KB), so I tried to change it in devmap.raid0 from 128 to 64, but then I couldn't even mount the partition...
Any ideas what it could be, or what else I could try? Would be very nice to get the raid working under 2.6, because 160GB of space more or less aren't something I would like to waste
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have you verified the chunk size of your raid? which filesystem do you use on these two partitions?
my first steps with this failed because i configured the wrong chunk-size. i think you could even mount a fat-partition with a incorrect chunk-size as long as the fat (the meta-information for the filesystem itself) fits in one chunk (or so...).
what's the output of fsck on these two partitions? |
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Kileak n00b
Joined: 12 Jun 2003 Posts: 37 Location: Giessen, Germany
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Posted: Sat Apr 17, 2004 8:47 pm Post subject: |
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Well, the chunk-size is 32K and the fs is FAT32...
But I already tried to use 8,16,32,64,128,256 as chunk size (just to be sure ) and nothing worked... If I enter a chunk size less than 128 I can't even mount it, and if I choose >= 128 I can mount the partitions, but the filesystem is just trash...
Could the mistake be somewhere else?
Code: | kileak raid # ls /dev/hde*
/dev/hde /dev/hde1 /dev/hde2
kileak raid # ls /dev/hdg*
/dev/hdg
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if I choose a chunk size of 64 dmesg gives me
Code: | FAT: Did not find valid FSINFO signature.
Found signature1 0x00000000 signature2 0x00000000 (sector = 1)
FAT: invalid first entry of FAT (0xffffff8 != 0x1b01)
VFS: Can't find a valid FAT filesystem on dev dm-1.
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everything less 64 gives
Code: | FAT: bogus number of reserved sectors
VFS: Can't find a valid FAT filesystem on dev dm-3.
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vlad_tepes n00b
Joined: 27 Mar 2004 Posts: 10
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Posted: Sun Apr 18, 2004 9:05 am Post subject: |
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Kileak wrote: | Well, the chunk-size is 32K and the fs is FAT32...
But I already tried to use 8,16,32,64,128,256 as chunk size (just to be sure ) and nothing worked... If I enter a chunk size less than 128 I can't even mount it, and if I choose >= 128 I can mount the partitions, but the filesystem is just trash...
Could the mistake be somewhere else?
Code: | kileak raid # ls /dev/hde*
/dev/hde /dev/hde1 /dev/hde2
kileak raid # ls /dev/hdg*
/dev/hdg
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if I choose a chunk size of 64 dmesg gives me
Code: | FAT: Did not find valid FSINFO signature.
Found signature1 0x00000000 signature2 0x00000000 (sector = 1)
FAT: invalid first entry of FAT (0xffffff8 != 0x1b01)
VFS: Can't find a valid FAT filesystem on dev dm-1.
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everything less 64 gives
Code: | FAT: bogus number of reserved sectors
VFS: Can't find a valid FAT filesystem on dev dm-3.
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sorry, i am at the end of my knowledge...
but a few more questions:
- can you access the filesystem from DOS or Windows without errors?
- Did you make the Filesystem through DOS/Windows or through Linux/mkfs?
- How do you mount the filesystem (which options)?
I think this is not a problem of device-mapping. Maybe the filesystem is damaged. There are also a lot of posts telling about problems with the HPT37x chip.
sorry, can't help...
-robert |
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Kileak n00b
Joined: 12 Jun 2003 Posts: 37 Location: Giessen, Germany
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Posted: Sun Apr 18, 2004 9:35 am Post subject: |
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vlad_tepes wrote: |
but a few more questions:
- can you access the filesystem from DOS or Windows without errors?
- Did you make the Filesystem through DOS/Windows or through Linux/mkfs?
- How do you mount the filesystem (which options)?
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well, no problem in win. but i created the fs with partition magic, since windows couldn't create 80GB FAT32 partitions, maybe this is the problem?
but i had no problems with kernel 2.4.25 and the hpt370 software raid moudle...
to mount the partitions i made the following entry in /etc/fstab
Code: |
/dev/mapper/raid0p1 /mnt/raid/part1 vfat users,exec,rw,noauto,gid=users,umask=0002 0 0
/dev/mapper/raid0p2 /mnt/raid/part2 auto users,exec,rw,noauto,gid=users,umask=0002 0 0
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vlad_tepes wrote: | sorry, can't help...
-robert |
well, thanks anyway |
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defined n00b
Joined: 24 Apr 2004 Posts: 2 Location: Belgium
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Posted: Sat Apr 24, 2004 12:22 am Post subject: |
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Kileak wrote: | vlad_tepes wrote: |
but a few more questions:
- can you access the filesystem from DOS or Windows without errors?
- Did you make the Filesystem through DOS/Windows or through Linux/mkfs?
- How do you mount the filesystem (which options)?
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well, no problem in win. but i created the fs with partition magic, since windows couldn't create 80GB FAT32 partitions, maybe this is the problem?
but i had no problems with kernel 2.4.25 and the hpt370 software raid moudle...
to mount the partitions i made the following entry in /etc/fstab
Code: |
/dev/mapper/raid0p1 /mnt/raid/part1 vfat users,exec,rw,noauto,gid=users,umask=0002 0 0
/dev/mapper/raid0p2 /mnt/raid/part2 auto users,exec,rw,noauto,gid=users,umask=0002 0 0
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vlad_tepes wrote: | sorry, can't help...
-robert |
well, thanks anyway |
i tried to do this on a highpoint 372 setup with 4 (maxtor80gb) disks attached,
tried 16->128 chunks...only 128 produced devices which i could mount..but didnt seem valid filesystems
eventho, when i check in fdisk, all chunksizes produce the correct partitiontable(2partitions, 1 ntfs and 1ext3)
this is what my raid0 looks like:
0 960486912 striped 4 64 /dev/hde 0 /dev/hdf 0 /dev/hdg 0 /dev/hdh 0
# sfdisk -d /dev/mapper/raid0
# partition table of /dev/mapper/raid0
unit: sectors
/dev/mapper/raid0p1 : start=550884915, size=409593240, Id= 7
/dev/mapper/raid0p2 : start= 63, size=550884852, Id=83
/dev/mapper/raid0p3 : start= 0, size= 0, Id= 0
/dev/mapper/raid0p4 : start= 0, size= 0, Id= 0
so my raid0p1 looks like:
0 409593240 linear /dev/mapper/raid0 550884915
and raid0p2 is:
0 550884852 linear /dev/mapper/raid0 63
no success so far.. if anyone gets it working on a highpoint controller, plz let me know |
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WL(inux) n00b
Joined: 15 Jan 2004 Posts: 64 Location: Vienna
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Posted: Sat Apr 24, 2004 10:45 am Post subject: |
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I love linux but what i hate is my raid controller
After spending 2 days surfing through forums and other infos, setting up ataraid and later device-mapper ...
WHY THE HELL is there no solution:
the situation:
2x 120GB WD Stripe Set Promise onboard Raid.
Windows can boot from this.
Bootloaders supportet by linux fail
You always need to load device-mapper or other scripts before accessing the disk array ... why the hell is windows able to do this and linux not ... i'm sure there is a way but its tooo complex or is there no way ?
After 3 days I am no going to give it up and do a normal 2 disk dual boot system. one disk linux and the other is win
If there is a solution out there without using a third disk so please tell me _________________ http://www.ViennaLinux.at - Linux User Group Wien
please look @ http://Forum.ViennaLinux.at |
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zeano n00b
Joined: 27 Jan 2004 Posts: 5
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Posted: Sun Apr 25, 2004 9:16 pm Post subject: |
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I used this method on my Silicon Image Sil 3112 SATA RAID and got it working quite well, i have been getting some strange errors when putting the array under heavy load.
I've tryed both the siimage module and the sata_sil module that uses libata. The siimage module tended to lockup quite a bit so i'm currently using the sata_sil module although it adds the drives as scsi devices which means i can't use some SMART features such as hddtemp or many of hdparm's features. :/
I've edited vlad_tepe's script to create the devmaps so that it works with multiple partitions, but my bash scripting knowledge is very poor so i won't post it unless anyone requests.
Last edited by zeano on Tue Jun 15, 2004 2:11 pm; edited 2 times in total |
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libolt n00b
Joined: 19 Apr 2003 Posts: 25
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Posted: Thu Apr 29, 2004 3:45 am Post subject: |
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Hi I've followed this thread with much interest as I have a Promise pdc20271 controller and 2 200 gigabyte hard drives that are setup in a raid1 mirror with data already on them.
However, I'm having trouble figuring out what are the proper options to set in the table for dmsetup
I have /dev/hde and /dev/hdg which are identical in size.
Any help is greatly appreciated,
Mike |
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cyrillic Watchman
Joined: 19 Feb 2003 Posts: 7313 Location: Groton, Massachusetts USA
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Posted: Fri Jun 11, 2004 2:53 am Post subject: |
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defined wrote: | no success so far.. if anyone gets it working on a highpoint controller, plz let me know |
I got it working on my HPT374 after browsing the source code for the 2.4 kernel's ataraid/hptraid driver. I found this little piece of info.
drivers/ide/raid/hptraid.c wrote: | /* All but the first disk have a 10 sector offset */
if (i>0)
bh->b_rsector+=10; |
So, I adjusted my devmap files accordingly.
Code: | # cat devmap.raid0
0 312602720 striped 2 128 /dev/hde 0 /dev/hdg 10
# cat devmap.raid0p1
0 61432496 linear /dev/mapper/raid0 63 |
I can now mount this NTFS partition without getting errors. |
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ennservogt n00b
Joined: 27 May 2004 Posts: 32
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Posted: Mon Jun 14, 2004 3:53 pm Post subject: Thank you... |
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Thank you...
For the last three month I have tried to get my Promise PDC20271 Controller in RAID mode 0 (stripe) under Linux to work. I even mailed the Promise support, but they sait that it is impossible at the moment.
By the way, your little how-to is one of the best I have ever read. No joke! It's easy to understand and you can follow everything step by step!
THANK YOU
THANK YOU
THANK YOU |
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c_riis n00b
Joined: 22 May 2004 Posts: 9 Location: Denmark, Copenhagen
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Posted: Tue Jun 15, 2004 10:14 am Post subject: modprobe doesn't work |
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hey,
I use a 2.6.6-rc1 kernel,
in proc/pci i have:
RAID bus controller: Promise Technology, Inc. PDC20276 IDE (rev 1).
But following your howto I can't get modprobe pdc202xx_new working, it says
FATAL: module pdc202xx_new not found.
How do i get the module ? is it because of kernel 2.6.6 ?
I'd like a bit of guidance.
- Christian |
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rockthesmurf n00b
Joined: 28 May 2004 Posts: 3 Location: UK
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Posted: Wed Jun 16, 2004 2:15 am Post subject: Stuck on step one :( |
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I have 2x80gig hard drives (hde and hdg) in a raid0 array. This array is then split into 3 seperate paritions, I have been following the instructions, and first ran :
Code: | echo 0 $(expr $(blockdev --getsize /dev/hde) '*' 2) striped 2 128 /dev/hde 0 /dev/hdg 0 > devmap.raid |
This gave me a file 'devmap.raid' containing the following:
0 312711168 striped 2 128 /dev/hde 0 /dev/hdg 0
So far so good, but when I try and activate this I get an error:
dmsetup create raid0 devmap.raid
device-mapper ioctl cmd 9 failed: No such device or address
Command failed
Could anyone suggest what I might be doing wrong? The devices hde and hdg are there, so I'm not sure why it says no such device and so on
Much appreciated,
Steven Craft |
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