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Boczkowski_D
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Joined: 06 Aug 2007
Posts: 160
Location: Poland
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 Posted: Thu Jun 02, 2011 6:05 am Post subject: Disable Swap partition |
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I would like to disable swap partition. I have finally 2GB of RAM and would like to try how my box would work without disk access for memory demands. Is it so simple to remove it only from fstab or something else should be done? The other question is whether it is possible to reuse swap space if disabled. My fstab file looks this way:
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/dev/sda1 /mnt/win/c ntfs defaults,noatime 0 0
/dev/sda2 / ext3 noatime 1 2
/dev/sda5 /home ext3 noatime 0 1
/dev/sda6 none swap sw 0 0
/dev/sda7 /mnt/win/d vfat defaults,noatime,user,umask=000 0 0
/dev/sda8 /mnt/win/e vfat defaults,noatime,user 0 0
/dev/sda9 /mnt/win/f vfat defaults,noatime,user 0 0
/dev/sr0 /mnt/cdrom0 auto noauto,user 0 0
shm /dev/shm tmpfs nodev,nosuid,noexec 0 0
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The best way would be to enlarge /home partition with swap space. Is it doable without loosing data? |
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mbar
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Joined: 19 Jan 2005
Posts: 1990
Location: Poland
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| Posted: Thu Jun 02, 2011 6:54 am Post subject: |
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Yeah, commenting out swap from fstab is sufficient, but requires reboot.
If you do not want to reboot now, use:
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wcg
Guru
Joined: 06 Jan 2009
Posts: 588
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| Posted: Thu Jun 02, 2011 2:50 pm Post subject: |
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Reusing it as a file system requires reformatting it. A swap partition has
a different disk format than a filesystem intended for normal files.
(mkswap vs mke2fs, etc).
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Hu
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Joined: 06 Mar 2007
Posts: 21635
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| Posted: Thu Jun 02, 2011 10:39 pm Post subject: Re: Disable Swap partition |
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| Boczkowski_D wrote: | | The best way would be to enlarge /home partition with swap space. Is it doable without loosing data? |
Assuming that the partitions are physically adjacent, then yes, you can grow sda5 after you delete sda6. However, you would then need to rewrite all references sda7 and above. |
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Boczkowski_D
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Joined: 06 Aug 2007
Posts: 160
Location: Poland
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| Posted: Fri Jun 03, 2011 4:24 pm Post subject: |
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Well, I am not sure if sda5 and sda6 are aligned. Is it possible to check that?
I can use cfdisk to delete /home/sda6 partition and then make sda5 bigger. Will it format sda5 at once? How shall I do that safely? Some guide is desirable... |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Fri Jun 03, 2011 6:19 pm Post subject: |
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Boczkowski_D,
will tell you where the partitions are on the disk
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Boczkowski_D
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Joined: 06 Aug 2007
Posts: 160
Location: Poland
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| Posted: Fri Jun 03, 2011 8:53 pm Post subject: |
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It seems sda5 and sda6 are next to each other:
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panda darek # fdisk -l /dev/sda
Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x48784877
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1305 10482381 7 HPFS/NTFS
/dev/sda2 1306 2550 10000462+ 83 Linux
/dev/sda3 2551 19457 135805477+ f W95 Ext'd (LBA)
/dev/sda5 2551 3172 4996183+ 83 Linux
/dev/sda6 3173 3264 738958+ 82 Linux swap / Solaris
/dev/sda7 3265 7181 31463271 b W95 FAT32
/dev/sda8 7182 11098 31463271 b W95 FAT32
/dev/sda9 11099 19457 67143636 b W95 FAT32
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Neddy, what should be next steps then to recover the swap space? |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Fri Jun 03, 2011 9:12 pm Post subject: |
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Boczkowski_D,
| Code: | /dev/sda5 2551 3172 4996183+ 83 Linux
/dev/sda6 3173 3264 738958+ 82 Linux swap / Solaris |
That looks good.
Delete both partitions 5 and 6. That will cause partitions 7, 8 and 9 to become 5,6 and 7.
Your data is till there but meanwhile you have destroyed to pointers to it.
Make a new partition, it will be partition 8, filling the space. As partition 8 now starts where partition 5 was, your Linux is available again.
However, the filesystem size is as yet, unchanged so you now have the same filesystem which is smaller than the partition that holds it.
The last step is to grow the filesystem into the empty space. How you do that is filesystem dependent.
This a dangerous operation to do without validated backups. So start out by making and validating two copies of your valuable data.
Its very important that /dev/sda8 and /dev/sda5 both start in *identical* places. When you write the new partition table for /dev/sda8 it must overwrite the old disused /dev/sda5 entry exactly or it will destroy the start of your filesystem
Parted can do this for you but thats what it does behind your pack.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Boczkowski_D
Apprentice
Joined: 06 Aug 2007
Posts: 160
Location: Poland
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| Posted: Sat Jun 04, 2011 5:26 am Post subject: |
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Neddy,
I am a bit confused. From your description it seems I need to take 3 steps, but step:
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Make a new partition, it will be partition 8, filling the space.
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and step:
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The last step is to grow the filesystem into the empty space.
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are actually the same ones, right?
The other thing is when resize is done and data is missing will I get the running box again? I thought about just copying /home partition content to the windows partition and bring them back after operation is completed. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54244
Location: 56N 3W
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| Posted: Sat Jun 04, 2011 9:07 am Post subject: |
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Boczkowski_D,
No data is ever missing - unless you mess up making the new partition. The pointers to the data are missing but the data is completely untouched.
| Quote: | | Make a new partition, it will be partition 8, filling the space. |
and | Quote: | | The last step is to grow the filesystem into the empty space. |
are not the same thing.
Normally, when you make a partition then make a filesystem on it, the filesystem fills the partition. When you resize the partition, thats all that happens. You are making a bigger partition under your existing filesystem. The filesystem will not grow to fill the new space. You will need to use a filesystem utility to do the grow. The exact command depends on your filesystem type
As Hu has said, you will need to fix /etc/fstab and grub.conf to point to the new partition and if your /boot is there, you will need to chroot into the /dev/sda8 install and reinstall grub to the MBR, or it will look for grub.con on /dev/sda5 still, so your system won't boot.
parted (or gparted?) can hide most of this from you.
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Boczkowski_D
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Joined: 06 Aug 2007
Posts: 160
Location: Poland
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| Posted: Sun Feb 05, 2012 8:52 pm Post subject: |
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It's been a while from last post, but since then I haven't gone anywhere. I believe I need your close assistance, Neddy.
Print option under parted shows:
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(parted) print
Model: ATA WDC WD1600JB-00G (scsi)
Disk /dev/sda: 160GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 32.3kB 10.7GB 10.7GB primary ntfs boot
2 10.7GB 21.0GB 10.2GB primary ext3
3 21.0GB 160GB 139GB extended lba
5 21.0GB 26.1GB 5116MB logical ext3
6 26.1GB 26.8GB 757MB logical linux-swap(v1)
7 26.8GB 59.1GB 32.2GB logical fat32
8 59.1GB 91.3GB 32.2GB logical fat32
9 91.3GB 160GB 68.8GB logical fat32
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From what you wrote I need to do following:
1) Delete partitions 5 and 6 with parted:
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(parted) rm 6
(parted) rm 5
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2) Create new partition ( 8 ) in released space
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(parted) mkpart logical ext3 2551 3264
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3) Grow filesystem for empty space
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(parted) mkfs 8 ext3
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or
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# mkfs.ext3 /dev/sda8
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Please check if these steps are correct. The only thing that I am worried about is man for parted doesn't show ext3 support. Maybe in this case it will be better to use cfdisk? |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54244
Location: 56N 3W
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| Posted: Sun Feb 05, 2012 9:27 pm Post subject: |
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Boczkowski_D,
You must not make a new filesystem in sda8 that *WILL DESTROY* your data.
Everything except the mkfs commands looks ok.
You can use any partition tool you like as you will not use any partitioning tool to adjust your filesystems.
Once sda8 exists, your old filesystem will be there but it will not fill the new partition.
As we know your filesystem is ext3, you need resize2fs to grow the filesystem to fit the new partition size.
Read to find out what to do
Be sure ti fix /etc/fstab and grub.conf as required before you reboot.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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