[Ocfs2-users] Did anything substantial change between 1.2.4 and 1.3.9?
mike
mike503 at gmail.com
Mon Apr 21 14:34:18 PDT 2008
Since these are production I can't do much.
But I did get an error (it's not happening as much but it still blips
here and there)
Notice that /dev/sdb (my iscsi target using ocfs2) hits 0.00%
utilization, 3 seconds before my proxy says "hey, timeout" - every
other second there is -always- some utilization going on.
What could be steps to figure out this issue? Using debugfs.ocfs2 or something?
It's mounted as:
/dev/sdb1 on /home type ocfs2
(rw,_netdev,noatime,data=writeback,heartbeat=local)
I know I'm not being much help, but I'm willing to try almost anything
as long as it doesn't cause downtime or require cluster-wide changes
(since those require downtime...) - I want to try to go back to
2.6.24-16 with data=writeback and see if that fixes the crashing
issue, but if I'm having issues already like this perhaps I should
resolve this before moving up.
[root at web03 ~]# cat /root/web03-iostat.txt
Time: 02:11:46 PM
avg-cpu: %user %nice %system %iowait %steal %idle
3.71 0.00 27.23 8.91 0.00 60.15
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz await svctm %util
sda 0.00 54.46 0.00 309.90 0.00 2914.85
9.41 23.08 74.47 0.93 28.71
sdb 12.87 0.00 17.82 0.00 245.54 0.00
13.78 0.33 17.78 18.33 32.67
Time: 02:11:47 PM
avg-cpu: %user %nice %system %iowait %steal %idle
0.25 0.00 26.24 2.23 0.00 71.29
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz 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
sdb 5.94 0.00 22.77 0.99 228.71 0.99
9.67 0.42 17.92 17.08 40.59
Time: 02:11:48 PM <- THIS HAS THE ISSUE
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 25.99 0.00 0.00 74.01
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz await svctm %util
sda 0.00 10.89 0.00 2.97 0.00 110.89
37.33 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
Time: 02:11:49 PM
avg-cpu: %user %nice %system %iowait %steal %idle
0.25 0.00 14.85 0.99 0.00 83.91
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz 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
sdb 0.99 0.00 2.97 0.99 30.69 0.99
8.00 0.07 17.50 17.50 6.93
Time: 02:11:50 PM
avg-cpu: %user %nice %system %iowait %steal %idle
0.74 0.00 1.24 1.73 0.00 96.29
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz 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
sdb 0.99 0.00 5.94 0.00 55.45 0.00
9.33 0.07 11.67 11.67 6.93
Time: 02:11:51 PM
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 1.24 16.34 0.00 82.43
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz await svctm %util
sda 0.00 153.47 0.00 494.06 0.00 5156.44
10.44 55.62 107.23 1.16 57.43
sdb 2.97 0.00 11.88 0.99 117.82 0.99
9.23 0.26 13.08 20.00 25.74
Time: 02:11:52 PM
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.25 3.22 0.00 96.53
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz await svctm %util
sda 0.00 0.00 0.00 16.83 0.00 158.42
9.41 0.13 164.71 1.18 1.98
sdb 1.98 0.00 2.97 0.00 39.60 0.00
13.33 0.13 73.33 43.33 12.87
Time: 02:11:53 PM
avg-cpu: %user %nice %system %iowait %steal %idle
0.50 0.00 0.25 4.70 0.00 94.55
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz 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
sdb 5.94 0.00 11.88 0.99 141.58 0.99
11.08 0.20 15.38 15.38 19.80
Time: 02:11:54 PM
avg-cpu: %user %nice %system %iowait %steal %idle
3.96 0.00 10.15 0.74 0.00 85.15
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz await svctm %util
sda 0.00 20.79 0.00 4.95 0.00 205.94
41.60 0.00 0.00 0.00 0.00
sdb 4.95 0.00 5.94 0.00 87.13 0.00
14.67 0.07 11.67 11.67 6.93
On 4/21/08, Sunil Mushran <Sunil.Mushran at oracle.com> wrote:
> Do you have the panic output... kernel stack trace. We'll need
> that to figure this out. Without that, we can only speculate.
>
> mike wrote:
> >
> > On 4/21/08, Tao Ma <tao.ma at oracle.com> wrote:
> >
> >
> > > mike wrote:
> > >
> > >
> > > > I have changed my kernel back to 2.6.22-14-server, and now I don't get
> > > > the kernel panics. It seems like an issue with 2.6.24-16 and some i/o
> > > > made it crash...
> > > >
> > > >
> > > >
> > > >
> > > OK, so it seems that it is a bug for ocfs2 kernel, not the ocfs2-tools.
> :)
> > > Then could you please describe it in more detail about how the kernel
> panic
> > > happens?
> > >
> > >
> >
> > Yeah, this specific issue seems like a kernel issue.
> >
> > I don't know, these are production systems and I am already getting
> > angry customers. I can't really test anymore. Both are standard Ubuntu
> > kernels.
> >
> > Okay: 2.6.22-14-server (I think still minor file access issues)
> > Breaks under load: 2.6.24-16-server
> >
> >
> >
> >
> > >
> > > > However I am still getting file access timeouts once in a while. I am
> > > > nervous about putting more load on the setup.
> > > >
> > > >
> > > >
> > > >
> > > Also please provide more details about it.
> > >
> > >
> >
> > I am using nginx for a frontend load balancer, and nginx for a
> > webserver as well. This doesn't seem to be related to the webserver at
> > all though, it was happening before this.
> >
> > lvs01 proxies traffic in to web01, web02, and web03 (currently using
> > nginx, before I was using LVS/ipvsadm)
> >
> > Every so often, one of the webservers sends me back
> >
> >
> >
> > >
> > > > [root at raid01 .batch]# cat /etc/default/o2cb
> > > >
> > > > # O2CB_ENABLED: 'true' means to load the driver on boot.
> > > > O2CB_ENABLED=true
> > > >
> > > > # O2CB_BOOTCLUSTER: If not empty, the name of a cluster to start.
> > > > O2CB_BOOTCLUSTER=mycluster
> > > >
> > > > # O2CB_HEARTBEAT_THRESHOLD: Iterations before a node is considered
> dead.
> > > > O2CB_HEARTBEAT_THRESHOLD=7
> > > >
> > > >
> > > >
> > > >
> > > This value is a little smaller, so how did you build up your shared
> > > disk(iSCSI or ...)? The most common value I heard of is 61. It is about
> 120
> > > secs. I don't know the reason and maybe Sunil can tell you. ;)
> > > You can also refer to
> > >
> http://oss.oracle.com/projects/ocfs2/dist/documentation/ocfs2_faq.html#TIMEOUT.
> > >
> > >
> > >
> > > > # O2CB_IDLE_TIMEOUT_MS: Time in ms before a network connection is
> > > > considered dead.
> > > > O2CB_IDLE_TIMEOUT_MS=10000
> > > >
> > > > # O2CB_KEEPALIVE_DELAY_MS: Max time in ms before a keepalive packet is
> > > >
> > > >
> > > sent
> > >
> > >
> > > > O2CB_KEEPALIVE_DELAY_MS=5000
> > > >
> > > > # O2CB_RECONNECT_DELAY_MS: Min time in ms between connection attempts
> > > > O2CB_RECONNECT_DELAY_MS=2000
> > > >
> > > >
> > > > On 4/21/08, Tao Ma <tao.ma at oracle.com> wrote:
> > > >
> > > >
> > > >
> > > >
> > > > > Hi Mike,
> > > > > Are you sure it is caused by the update of ocfs2-tools?
> > > > > AFAIK, the ocfs2-tools only include tools like mkfs, fsck and tunefs
> > > > >
> > > > >
> > > >
> > > etc. So
> > >
> > >
> > > >
> > > > > if you don't make any change to the disk(by using this new tools),
> it
> > > > > shouldn't cause the problem of kernel panic since they are all user
> > > > >
> > > > >
> > > >
> > > space
> > >
> > >
> > > >
> > > > > tools.
> > > > > Then there is only one thing maybe. Have you modify
> > > > >
> > > > >
> > > >
> > > /etc/sysconfig/o2cb(This
> > >
> > >
> > > >
> > > > > is the place for RHEL, not sure the place in ubuntu)? I have checked
> the
> > > > >
> > > > >
> > > >
> > > rpm
> > >
> > >
> > > >
> > > > > package for RHEL, it will update /etc/sysconfig/o2cb and this file
> has
> > > > >
> > > > >
> > > >
> > > some
> > >
> > >
> > > >
> > > > > timeouts defined in it.
> > > > > So do you have some backups for this file? If yes, please restore it
> to
> > > > >
> > > > >
> > > >
> > > see
> > >
> > >
> > > >
> > > > > whether it helps(I can't say it for sure).
> > > > > If not, do you remember the old value of some timeouts you set for
> > > > >
> > > > >
> > > >
> > > ocfs2? If
> > >
> > >
> > > >
> > > > > yes, you can use o2cb configure to set them by yourself.
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > >
> > >
> >
> > _______________________________________________
> > Ocfs2-users mailing list
> > Ocfs2-users at oss.oracle.com
> > http://oss.oracle.com/mailman/listinfo/ocfs2-users
> >
> >
>
>
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