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knirirr
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PostPosted: Tue Jan 29, 2013 12:07 pm    Post subject: Megaraid hassle Reply with quote

The recent update to udev-197 required that I rebuild the kernel on various machines (taking the opportunity to upgrade to the newest gentoo-sources, 3.6.11), one of which is no longer bootable afterwards. It has the following hardware:

Code:

           *-pci:1
                description: PCI bridge
                product: 80332 [Dobson] I/O processor (B-Segment Bridge)
                vendor: Intel Corporation
                physical id: 0.2
                bus info: pci@0000:01:00.2
                version: 06
                width: 32 bits
                clock: 33MHz
                capabilities: pci pciexpress msi pm pcix normal_decode bus_master cap_list
              *-storage
                   description: RAID bus controller
                   product: MegaRAID
                   vendor: LSI Logic / Symbios Logic
                   physical id: b
                   bus info: pci@0000:03:0b.0
                   logical name: scsi2
                   version: 01
                   width: 32 bits
                   clock: 66MHz
                   capabilities: storage pm bus_master cap_list
                   configuration: latency=32
                   resources: iomemory:d8ff0000-d8ffffff irq:37
                 *-processor:0 UNCLAIMED
                      description: SCSI Processor
                      product: 1x2 SCSI BP
                      vendor: PE/PV
                      physical id: 0.6.0
                      bus info: scsi@2:0.6.0
                      version: 1.0
                      serial: 1
                      configuration: ansiversion=2
                 *-processor:1 UNCLAIMED
                      description: SCSI Processor
                      product: PV22XS
                      vendor: DELL
                      physical id: 1.6.0
                      bus info: scsi@2:1.6.0
                      version: E.17
                      configuration: ansiversion=3
                 *-disk:0
                      description: SCSI Disk
                      product: LD0 RAID1 69880R
                      vendor: MegaRAID
                      physical id: 2.0.0
                      bus info: scsi@2:2.0.0
                      logical name: /dev/sda
                      version: 350O
                      size: 68GiB (73GB)
                      capabilities: partitioned partitioned:dos
                      configuration: ansiversion=2 sectorsize=512 signature=0009fdd2
                    *-volume:0
                         description: EXT3 volume
                         vendor: Linux
                         physical id: 1
                         bus info: scsi@2:2.0.0,1
                         logical name: /dev/sda1
                         logical name: /
                         version: 1.0
                         serial: 722c866e-0b8f-465b-9fb6-ed72734fe558
                         size: 60GiB
                         capacity: 60GiB
                         capabilities: primary bootable journaled extended_attributes large_files recover ext3 ext2 initialized
                         configuration: created=2011-03-31 16:50:47 filesystem=ext3 label=/ modified=2013-01-29 11:49:40 mount.fstype=ext3 mount.options=rw,relatime,errors=continue,barrier=1,data=writeback mounted=2013-01-29 11:49:40 state=mounted
                    *-volume:1
                         description: Linux swap volume
                         physical id: 2
                         bus info: scsi@2:2.0.0,2
                         logical name: /dev/sda2
                         version: 1
                         serial: dcd8f6f1-edb9-420e-9aca-822b82ec425f
                         size: 8424MiB
                         capacity: 8424MiB
                         capabilities: primary nofs swap initialized
                         configuration: filesystem=swap pagesize=4096
                 *-disk:1
                      description: SCSI Disk
                      product: LD1 RAID5 38900R
                      vendor: MegaRAID
                      physical id: 2.1.0
                      bus info: scsi@2:2.1.0
                      logical name: /dev/sdb
                      version: 350O
                      size: 1502GiB (1613GB)
                      capabilities: partitioned partitioned:dos
                      configuration: ansiversion=2 sectorsize=512 signature=000a16a1
                    *-volume:0
                         description: EXT3 volume
                         vendor: Linux
                         physical id: 1
                         bus info: scsi@2:2.1.0,1
                         logical name: /dev/sdb1
                         version: 1.0
                         serial: a7b5286d-178b-481b-b8b3-734dac778c8c
                         size: 1502GiB
                         capacity: 1578GiB
                         capabilities: primary journaled extended_attributes large_files ext3 ext2 initialized
                         configuration: created=2011-04-01 09:39:14 filesystem=ext3 label=/home modified=2013-01-28 12:27:51 mounted=2013-01-28 11:59:50 state=clean
                    *-volume:1
                         description: Linux filesystem partition
                         physical id: 2
                         bus info: scsi@2:2.1.0,2
                         logical name: /dev/sdb2
                         capacity: 299GiB
                         capabilities: primary
                    *-volume:2
                         description: Empty partition
                         physical id: 3
                         bus info: scsi@2:2.1.0,3
                         logical name: /dev/sdb3
                         capacity: 1007GiB
                         capabilities: primary nofs



If Megaraid support is not added then, unsurprisingly, the machine won't recognise the root device /dev/sda1. If it's compiled as a module then the system hangs on boot at around this point:

Code:

....
:: Scanning for megaraid...megaraid loaded.
:: Scanning for megaraid_mbox...megaraid_mm, megaraid_mbox loaded.


If I compile these various megaraid modules into the kernel instead then the result is a hang at "Switching to clocksource tsc".

The system boots perfectly to the install cd so I am currently using Genkernel to build a kernel to the same configuration in the hope that it might boot with that. Other than that I don't have any ideas, so if anyone else can see anything I may have missed then please let me know.

Edit: The install CD kernel did not work. I'm a bit stuck here, for clearly I need the megaraid driver but can't boot with it!
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nanoczar
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PostPosted: Tue Jan 29, 2013 5:19 pm    Post subject: Reply with quote

Just for clarification, do you have a RAID setup? The fact that it's looking for sda1 is strange if you do...at least it's not that way on my RAID system.
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knirirr
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PostPosted: Tue Jan 29, 2013 6:32 pm    Post subject: Reply with quote

nanoczar wrote:
Just for clarification, do you have a RAID setup? The fact that it's looking for sda1 is strange if you do...at least it's not that way on my RAID system.


Yes. IIRC the system has one external RAID array which has been configured to present a small sda and large sdb; the former is used for the OS and the latter for data.

I've managed to get it booting using the boot CD configuration and the additional command line of clocksource=acpi_pm, although I didn't have any luck with my previous kernel configuration. So, it's sort of working, but I am not really sure what the problem is.
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NeddySeagoon
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PostPosted: Tue Jan 29, 2013 6:51 pm    Post subject: Reply with quote

knirirr,

Code:
                   description: RAID bus controller
                   product: MegaRAID
                   vendor: LSI Logic / Symbios Logic


Its not a real raid controller. Do you use dmraid to use the software raid functionality ?
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knirirr
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PostPosted: Tue Jan 29, 2013 8:19 pm    Post subject: Reply with quote

NeddySeagoon wrote:

Its not a real raid controller. Do you use dmraid to use the software raid functionality ?


In what way is it not a real controller? I'm not using software RAID on this device, and megactl reports the following:

Code:

a0       PERC 4/DC                chan:2 ldrv:2  batt:good
a0d0       68GiB RAID 1   1x2  optimal
a0d1        1TiB RAID 5   1x12 optimal
hot spares   :  a0c1t8 
a0c0t0      68GiB  a0d0  online 
a0c0t1      68GiB  a0d0  online 
a0c1t1     136GiB  a0d1  online 
a0c1t2     136GiB  a0d1  online 
a0c1t3     136GiB  a0d1  online 
a0c1t4     136GiB  a0d1  online 
a0c1t5     136GiB  a0d1  online 
a0c1t8     136GiB        hotspare
a0c1t9     136GiB  a0d1  online 
a0c1t10    136GiB  a0d1  online 
a0c1t11    136GiB  a0d1  online 
a0c1t12    136GiB  a0d1  online 
a0c1t13    136GiB  a0d1  online 
a0c1t14    136GiB  a0d1  online 
a0c1t15    136GiB  a0d1  online 
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NeddySeagoon
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PostPosted: Tue Jan 29, 2013 10:04 pm    Post subject: Reply with quote

knirirr,

I take that back - that looks real raid to me.

Do you have
Code:
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
in your kernel. Genkernel will set those options.

I don't expect genkernel to work for you without a lot of help as it will probably leave out the megaraid drivers you need.

Can you put your kernel .config file on a pastebin and post the output of lspci and lspci -n please.
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knirirr
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PostPosted: Wed Jan 30, 2013 9:08 am    Post subject: Reply with quote

NeddySeagoon wrote:

Do you have
Code:
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
in your kernel. Genkernel will set those options.


Yes, these are both enabled.

NeddySeagoon wrote:

Can you put your kernel .config file on a pastebin and post the output of lspci and lspci -n please.


Here's the config for the old kernel:

http://pastebin.com/CkC0Qxy4

I couldn't get this config. to boot when I used it to compile 3.6.11; I'd get a hang when loading the megaraid drivers, or that clocksource error (see earlier post) if they were compiled into the kernel.

Here's one I generated with Genkernel using the boot CD's config:

http://pastebin.com/pPZ22SyF

This one I got to boot by specifying clocksource on boot:

Code:

# cat /proc/cmdline
root=/dev/ram0 real_root=/dev/sda1 clocksource=acpi_pm


However, I'm not sure why that works.
I've had to rebuild again overnight as I realised that I'd forgotten to build the iptables module, so I hope it will come up again after doing that...
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Wallsandfences
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PostPosted: Wed Jan 30, 2013 11:44 am    Post subject: Reply with quote

There's not much I can add, but did you give the clocksource boot hang some time (minutes)? I had that hangup during the first reboot after a fresh kernel a few weeks ago, and all I did was waiting a few minutes, and then it booted, and does so ever since.


Rüdiger
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knirirr
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PostPosted: Wed Jan 30, 2013 11:50 am    Post subject: Reply with quote

Wallsandfences wrote:
There's not much I can add, but did you give the clocksource boot hang some time (minutes)? I had that hangup during the first reboot after a fresh kernel a few weeks ago, and all I did was waiting a few minutes, and then it booted, and does so ever since.


I left it overnight after one hang and the machine stopped at not being able to read /dev/sda1. So, I presume that it tried for some time to load the modules and moved on after failing, only to find that the RAID array was inaccessible due to the lack of modules.
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