Date: Fri, 21 Oct 2011 13:37:14 +0200 From: Peter Maloney <peter.maloney@brockmann-consult.de> To: Steven Hartland <steven@multiplay.co.uk> Cc: freebsd-stable@freebsd.org Subject: Re: zfs parition probing causing long delay at BTX loader Message-ID: <4EA1596A.7070707@brockmann-consult.de> In-Reply-To: <4EA1583E.5000703@brockmann-consult.de> References: <441A588158B143D28A1B062A61FCDA43@multiplay.co.uk> <4EA146D2.8070809@brockmann-consult.de> <11B873BE453E4B78854D1FF051495B95@multiplay.co.uk> <4EA1583E.5000703@brockmann-consult.de>
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On 10/21/2011 01:32 PM, Peter Maloney wrote:
> On 10/21/2011 01:04 PM, Steven Hartland wrote:
>> ----- Original Message ----- From: "Peter Maloney"
>> <peter.maloney@brockmann-consult.de>
>> To: <freebsd-stable@freebsd.org>
>> Sent: Friday, October 21, 2011 11:17 AM
>> Subject: Re: zfs parition probing causing long delay at BTX loader
>>
>>
>>> On 10/20/2011 07:23 PM, Steven Hartland wrote:
>>>> Installing a new machine here which has 10+ disks
>>>> we're seeing BTX loader take 50+ seconds to enumerate
>>>> the disks.
>>> I am running 8-STABLE. On my system with 22 disks, it took much longer
>>> than a minute (maybe 5 minutes... not sure, but overall boot was
>>> about 7
>>> minutes). While this time is passing, I can watch the leds on the disks
>>> blink in order, many times in a loop.
>>>
>>> My IO card is a LSI SATA/SAS 9211-8i 6Gb/s.
>>
>> We are indeed using that 3 x 9211-8i's per chassis.
>>> After I upgraded the firmware to version 11, it seems to take much less
>>> time, but I didn't time it. And watching the LEDs last time I rebooted,
>>> I don't notice them all blinking the same way. Instead, all were solid
>>> for a second or two after the long wait, and then only the root disks.
>>
>> We are already running fw v11.00.00.00 but thanks for the heads up.
>>
> Are you running the IT or IR firmware version? I am running the IR one.
>
> And by the way, here is my uname -a:
> # uname -a
> FreeBSD bcnas1.bc.local 8.2-STABLE FreeBSD 8.2-STABLE #0: Thu Sep 29
> 15:06:03 CEST 2011
> root@bcnas1.bc.local:/usr/obj/usr/src/sys/GENERIC amd64
>
> And I installed 8-STABLE using cvsup using this date filter in my
> cvsup file:
> *default date=2011.09.27.00.00.00
>
> And I remember one other thing I did since the firmware upgrade. I
> booted off a Linux hard disk which I had to put in the first hard disk
> bay, or it wouldn't boot from it. So I moved the root disk somewhere
> else. FreeBSD still boots, so I left it where I moved it. I don't know
> if that changed the boot time.
>
>>> So if you have the same card, I suggest you update the firmware. (I
>>> updated for stability rather than boot speed, and it seemed stable
>>> until
>>> it froze today, after 2 weeks)
>>
>> Do you have any information about the hang?
> I decided to rename some of my replication snapshots to fill in gaps
> from daily snapshots (since I wasn't always doing them daily)... just
> so I could delete old replication snapshots.
>
> So I wrote a bash script to take the first replication snapshot per
> day and rename it
> (need to get bash from ports or hope it runs in sh):
>
> for day in {4..16}; do
> if [ "$day" -lt 10 ]; then
> day="0$day"
> fi
>
> firstSnapshotOfDay=$(zfs list -o name -t snapshot -r tank | grep
> -E "^tank@replication-201110${day}" | head -n1)
>
> if [ "$firstSnapshotOfDay" = "" ]; then
> continue
> fi
>
> time=$(echo ${firstSnapshotOfDay} | cut -d'-' -f2)
> hour=${time:8:2}
> minute=${time:10:2}
> second=${time:12:2}
>
> echo "============="
> echo $day $firstSnapshotOfDay $time $hour $minute $second
> echo zfs rename -r "${firstSnapshotOfDay}"
> tank@daily-2011-10-${day}T${hour}:${minute}:${second}
> done
>
> And then I took the output from it, and started running it.
> For example:
>
> zfs rename -r tank@replication-20111004111436
> tank@daily-2011-10-04T11:14:36
>
> I ran 8 of the commands like the above, which took about 1 second
> each. Then the 9th command froze.
>
> root@bcnas1:~/bin/zfs/snapshots# zfs rename -r
> tank@replication-20111013000000 tank@daily-2011-10-13T00:00:00
> ^C
> load: 0.13 cmd: zfs 70731 [tx->tx_sync_done_cv)] 489.40r 0.00u 0.07s
> 0% 1760k
> load: 0.01 cmd: zfs 70731 [tx->tx_sync_done_cv)] 638.13r 0.00u 0.07s
> 0% 1328k
>
> I then tried other things in other windows (using screen). Anything
> involving zpool or zfs would hang like this:
>
> root@bcnas1:~/bin/rsync# zpool status
> ^C^C
> load: 0.12 cmd: zpool 87352 [spa_namespace_lock] 479.77r 0.00u 0.00s
> 0% 1628k
> load: 0.01 cmd: zpool 87352 [spa_namespace_lock] 616.65r 0.00u 0.00s
> 0% 1288k
>
> Other attempts to read from the tank zpool worked fine. But maybe it
> was only reading from arc and l2arc. The system has 48 GB of memory.
> And my NFS mounts stopped working. NFS requests would just timeout.
>
> top, gstat, etc. all show an idle system. I had a "zpool iostat 5"
> running in another window, which was not frozen, but also just looked
> normal and idle.
>
> It reminds me of when I was using 8.2-RELEASE, and zfs destroy on a
> snapshot caused a kernel panic.
>
> I also tried kill -9 on the above "zfs rename" process, which didn't
> work (normal for processes waiting for kernel calls).
>
> Then I did "shutdown -r now" which got me to a screen (attached a
> photo... unfortunately I don't know how the serial console or KVM over
> IP works so can't get a proper log) saying that shutdown terminated
> abnormally, going to single user mode (never got a prompt though), and
> "some processes would not die; ps axl advised". I don't know which
> processes hung (58465 I guess) . If ctrl+t is showing the process id,
> then it wasn't one of the commands above. I think it might have been
> nfsd. (I have also found that "/etc/rc.d/nfsd restart" causes nfs to
> stop and never come back, and use lots of cpu; here is my post about
> it: http://forums.freebsd.org/showthread.php?t=26727)
>
> I looked through the logs, but don't see anything interesting. Here
> is the log from my reboot until not including the next boot:
>
> Oct 21 11:39:59 bcnas1 shutdown: reboot by peter:
> Oct 21 11:40:01 bcnas1 nmbd[64827]: [2011/10/21 11:40:01.422014, 0]
> nmbd/nmbd_browsesync.c:585(collect_all_workgroup_names_from_wins_server)
> Oct 21 11:40:01 bcnas1 nmbd[64827]:
> collect_all_workgroup_names_from_wins_server:
> Oct 21 11:40:01 bcnas1 nmbd[64827]: Cannot find my workgroup
> ARBEITSGRUPPE on subnet UNICAST_SUBNET.
> Oct 21 11:40:01 bcnas1 nmbd[64827]: [2011/10/21 11:40:01.522809, 0]
> nmbd/nmbd_browsesync.c:585(collect_all_workgroup_names_from_wins_server)
> Oct 21 11:40:01 bcnas1 nmbd[64827]:
> collect_all_workgroup_names_from_wins_server:
> Oct 21 11:40:01 bcnas1 nmbd[64827]: Cannot find my workgroup
> ARBEITSGRUPPE on subnet UNICAST_SUBNET.
> Oct 21 11:40:01 bcnas1 ntpd[75976]: ntpd exiting on signal 15
> Oct 21 11:40:01 bcnas1 nmbd[64827]: [2011/10/21 11:40:01.857859, 0]
> nmbd/nmbd.c:71(terminate)
> Oct 21 11:40:01 bcnas1 nmbd[64827]: Got SIGTERM: going down...
> Oct 21 11:40:31 bcnas1 rc.shutdown: 30 second watchdog timeout
> expired. Shutdown terminated.
> Oct 21 11:40:31 bcnas1 init: /bin/sh on /etc/rc.shutdown terminated
> abnormally, going to single user mode
> Oct 21 11:40:31 bcnas1 syslogd: exiting on signal 15
> Oct 21 11:47:39 bcnas1 syslogd: kernel boot file is /boot/kernel/kernel
>
> Looking at the screenshot, maybe 58465 is the process id that wouldn't
> die. I could not find that number in /var/log/messages.
>
>
> Any suggestions on where I can find useful information?
>
> I plan to keep searching for something that shows error messages. On
> every other panic, I would find SCSI errors, mps driver messages, etc.
>
>>
>> Regards
>> Steve
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>
>
> --
>
> --------------------------------------------
> Peter Maloney
> Brockmann Consult
> Max-Planck-Str. 2
> 21502 Geesthacht
> Germany
> Tel: +49 4152 889 300
> Fax: +49 4152 889 333
> E-mail: peter.maloney@brockmann-consult.de
> Internet: http://www.brockmann-consult.de
> --------------------------------------------
--
--------------------------------------------
Peter Maloney
Brockmann Consult
Max-Planck-Str. 2
21502 Geesthacht
Germany
Tel: +49 4152 889 300
Fax: +49 4152 889 333
E-mail: peter.maloney@brockmann-consult.de
Internet: http://www.brockmann-consult.de
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