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Re: [linux-lvm] Frozen root volume



What does your storage stack look like? Something in the stack froze
up. It could be your SAN storage device, if you're using one, the switch
connecting to the SAN, if you're using one, the RAID card, if you're
using one, the software RAID, if you're using software RAID ...

A reasonable next step if there is nothing in the logs because are on
the root device might be to use rsyslog to send the log data to a
neighboring machine. That would you can see the messages in the log no
matter which local storage has a problem. 
-- 
Ray Morris
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On Wed, 04 Apr 2012 19:38:25 -0500
Larkin Lowrey <llowrey nuclearwinter com> wrote:

> I've been chasing problem where my root volume freezes up and will not
> process any more i/o (at least no more writes).
> 
> The iostat output below shows what is going on when it gets in this
> state. The dm-1 device is stuck with avgrq-sz of 50 but zeros for all
> other values. All disks and raid devices hosting this volume show
> zeros across the board.
> 
> I am unable to cleanly shut down as all writes to the root fs are
> blocked so I have to do a hard reset.
> 
> I've attached the output of 'echo t > /proc/sysrq-trigger'.
> 
> This phenomenon did not occur prior to updating from F15 -> F16 so I
> doubt it's a hardware issue.
> 
> Any ideas or suggestions?
> 
> --Larkin
> 
> 
> Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s
> avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
> sda               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdb               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdc               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdd               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sde               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdf               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdg               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdh               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdi               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdj               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdk               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdl               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> md0               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> md1               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> md2               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> md10              0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdm               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdn               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdo               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdq               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdp               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdr               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sds               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdt               0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> dm-0              0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> dm-1              0.00     0.00    0.00    0.00     0.00     0.00
> 0.00    50.00    0.00    0.00    0.00   0.00 100.00
> dm-2              0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> dm-3              0.00     0.00    0.00    0.00     0.00     0.00
> 0.00     0.00    0.00    0.00    0.00   0.00   0.00
> 
> 


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