Hi, everyone
I have a question about the OCFS2 when I using it.
I setup a cluster with two nodes vmc-4, and vmc-7.
The host vmc-4's system time is very different with the host vmc-7, about more
than one day time. They all use the iSCSI storage target3.
The time is below:
root@vmc-7:~# date
Sun Jun 24 06:54:20 CST 2012
root@vmc-4:~# date
Mon Jun 25 09:53:35 CST 2012
When I am using vmc-4, and copying more then 200G data file to the directory
/vms/target3 mounted on vmc-4 as ocfs2 with target3.
At the same time, I add the host of vmc-7 into the ocfs2 cluster with command,
joining with vmc-4.
I execute the command on vmc-4:
o2cb_ctl -C -i -n vmc-7 -t node -a number=2 -a ip_address=192.168.0.7 -a
ip_port=7100 -a cluster=iPool
I copy the /etc/ocfs2/cluster.conf file from vmc-4 to vmc-7, and startup the
ocfs2 service using "service o2cb onload" and "service o2cb online".
And I mount the device of ocfs2 with /vms/target3 on the host of vmc-7. mount
-t ocfs2 /dev/sdb /vms/target3
And the result to see the file list on vmc-7 with debugfs.ocfs2 is interesting:
vmc-7:
debugfs: ls
513 16 1 2 .
513 16 2 2 ..
1412353 24 10 2 lost+found
1412354 16 3 1 111
1412355 16 4 1 abbb
1412356 20 7 1 BeiJing
1412357 24 9 2 caibackup
1412486 3764 8 1 caiWinXP
debugfs: slotmap
Slot# Node#
1 2
debugfs: hb
node: node seq generation checksum
1: 1 000000004fe7c52e ea6ac3ff9a179e7d 1b8ea7f3
2: 2 000000004fe64998 43909c20ab5bc319 8a18147e
debugfs: quit
root@vmc-7:~# mounted.ocfs2 -f
Device FS Nodes
/dev/sdb ocfs2 vmc-7
/dev/sdc ocfs2 Not mounted
/dev/sdd ocfs2 Not mounted
root@vmc-7:~#
And at the same time, the result of the file list on vmc-4 with debugfs.ocfs2:
root@vmc-4:~# mount | grep ocfs
ocfs2_dlmfs on /dlm type ocfs2_dlmfs (rw)
/dev/sdc on /vms/target3 type ocfs2 (rw,_netdev,heartbeat=local)
root@vmc-4:~# debugfs.ocfs2 /dev/sdc
debugfs.ocfs2 1.6.3
debugfs: ls
513 16 1 2 .
513 16 2 2 ..
1412353 24 10 2 lost+found
1412354 16 3 1 111
1412355 16 4 1 abbb
1412356 20 7 1 BeiJing
1412357 24 9 2 caibackup
1412486 3764 8 1 caiWinXP
debugfs: quit
root@vmc-4:~# ls -al /vms/target3/
total 64238596
drwxr-xr-x 4 root root 3896 Jun 25 09:50 .
drwxr-xr-x 15 root root 4096 Jun 25 09:39 ..
-rw------- 1 root root 6291968 Jun 25 09:40 111
-rw------- 1 root root 6291968 Jun 25 09:40 abbb
-rw------- 1 root root 12582912 Jun 25 09:40 BeiJing
drwxr-xr-x 8 root root 3896 Jun 25 09:40 caibackup
-rw------- 1 root root 3495952384 Jun 25 09:41 caiWinXP
-rwxr--r-- 1 root root 21550333952 Jun 25 09:45 convirture_ev
-rw-r--r-- 1 root root 17825792000 Jun 25 09:48 convirture_ev-clone0
-rwxr--r-- 1 root root 6744440832 Jun 25 09:49 convirture_ev-clone0-clone0
-rwxr--r-- 1 root root 2153775104 Jun 25 09:49 convirture_ev-clone1
-rw------- 1 root root 1786773504 Jun 25 09:50 DEBIAN_WXS
-rw-r--r-- 1 root root 12195987456 Jun 25 09:52 dvsc.img
drwxr-xr-x 2 root root 3896 Jun 25 09:37 lost+found
root@vmc-4:~#
Why so many files on vmc-4, and so small files on vmc-7 with debugfs.ocfs2
tools at the same time?
After unmounting on vmc-7 and remount the device on vmc-7, the vmc-7 host is
panic for mount time out, the kernel log is below:
Jun 25 06:03:56 vmc-7 kernel: [ 9226.663878] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 25 06:03:56 vmc-7 kernel: [ 9226.675662] mount.ocfs2 D ffffffff81806240
0 1214 1213 0x00000000
Jun 25 06:03:56 vmc-7 kernel: [ 9226.675668] ffff880212529838 0000000000000082
ffff8802125297f8 ffffffffa04f156b
While I reboot the vmc-4, the vmc-4 is also panic.
And I adjust the time on vmc-7 a little time difference with vmc-4, about 10
seconds, and reboot them.
They are OK with OCFS2 cluster. I mean the file list is same with each other,
and mounting operation is OK too.
This scenario can be repeated with two different time (a lot of time) nodes, I
test several times and it always appears..
There are some questions about it as below:
Is it that the time different a lot(more than 24 hours) for vmc-4 and vmc-7?
What is the time different limit between different nodes of OCFS2?
What's the side-effect of the different time between nodes of ocfs2 cluster,
and should all the nodes be set NTP for same time?
Thanks
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