Hello List,
since yesterday we're experiencing hang ups and low downs on one of our
ocfs2 clusters. Our 5 nodes connected through iSCSI i only able to write
/ read with around 20bytes/s (dd if=/dev/zero of=/mnt/ocfs2/test bs=256
count=2). At the same time the same nodes can write perfectly to another
ocfs2 filesystem (through the same network card and switch). I also
changed the whole fs part. to another backup storage device - but the
same thing happens.
So i'm quite sure it is a problem with the ocfs2 filesystem. A fsck
didn't show any problems.
Right now it is running fine - most probably because of low visits right
now.
FS details:
~# debugfs.ocfs2 -R "stats" /dev/sdb
Revision: 0.90
Mount Count: 0 Max Mount Count: 20
State: 0 Errors: 0
Check Interval: 0 Last Check: Fri Feb 17 21:59:21 2012
Creator OS: 0
Feature Compat: 3 backup-super strict-journal-super
Feature Incompat: 16208 sparse extended-slotmap inline-data
metaecc xattr indexed-dirs refcount discontig-bg
Tunefs Incomplete: 0
Feature RO compat: 1 unwritten
Root Blknum: 5 System Dir Blknum: 6
First Cluster Group Blknum: 3
Block Size Bits: 12 Cluster Size Bits: 12
Max Node Slots: 10
Extended Attributes Inline Size: 256
Label: ocfs2disk
UUID: B029D592BBB04D1ABA25111216009DD2
Hash: 476522312 (0x1c672748)
DX Seed[0]: 0x00000000
DX Seed[1]: 0x00000000
DX Seed[2]: 0x00000000
Cluster stack: classic o2cb
Inode: 2 Mode: 00 Generation: 2428650348 (0x90c2436c)
FS Generation: 2428650348 (0x90c2436c)
CRC32: f68f7e80 ECC: 0078
Type: Unknown Attr: 0x0 Flags: Valid System Superblock
Dynamic Features: (0x0)
User: 0 (root) Group: 0 (root) Size: 0
Links: 0 Clusters: 47456155
ctime: 0x4be7dd41 -- Mon May 10 12:17:37 2010
atime: 0x0 -- Thu Jan 1 01:00:00 1970
mtime: 0x4be7dd41 -- Mon May 10 12:17:37 2010
dtime: 0x0 -- Thu Jan 1 01:00:00 1970
ctime_nsec: 0x00000000 -- 0
atime_nsec: 0x00000000 -- 0
mtime_nsec: 0x00000000 -- 0
Refcount Block: 0
Last Extblk: 0 Orphan Slot: 0
Sub Alloc Slot: Global Sub Alloc Bit: 65535
~# cat /sys/kernel/debug/o2net/stats
1,5,1639450,1887540786,10231206351,220661950679,24433045,144802608142
1,2,1888282,2664740522,13589664854,299324139712,1342649,5540708637
1,3,1585381,2021551046,10894428756,238189878694,829297,3453566877
1,4,1573033,2025456266,10594374194,239043267702,1061860,5666562010
Any ideas? Thanks!
Greets
Stefan
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