On Thu, May 10, 2012 at 1:59 PM, Jay V <jvasaoo at gmail.com>
wrote:> Ever since the file system reached 82% full,?the file system has gone to a
> crawl and stalls of only writing?up to 10?mb/s, even going as slow as a few
> kbytes/sec.?The file system may be fragmented. Is there a defrag tool?
>
> I have tried many options, but nothing seems to work.
"data=writeback" does
> seem to work. We have checked the logs, debugs, traces trying to figure out
> the probelm, but with no success.
>
I meant to say data=writeback does not seem to work.
> Features:
> Compat: backup-super strict-journal-super
> Incompat: sparse inline-data
> RO Compat: unwritten
> debugfs.ocfs2 -R "stats" /dev/drbd2
> ??????? Revision: 0.90
> ??????? Mount Count: 0?? Max Mount Count: 20
> ??????? State: 0?? Errors: 0
> ??????? Check Interval: 0?? Last Check: Sat Mar 17 05:51:42 2012
> ??????? Creator OS: 0
> ??????? Feature Compat: 3 backup-super strict-journal-super
> ??????? Feature Incompat: 80 sparse inline-data
> ??????? 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: 2
> ??????? Extended Attributes Inline Size: 0
> ??????? Label: imepool2
> ??????? UUID: 5AAD4275BEBA4F96B8FEE7274FC4D043
> ??????? Hash: 0 (0x0)
> ??????? DX Seeds: 0 0 0 (0x00000000 0x00000000 0x00000000)
> ??????? Cluster stack: classic o2cb
> ??????? Cluster flags: 0
> ??????? Inode: 2?? Mode: 00?? Generation: 2084865048 (0x7c448418)
> ??????? FS Generation: 2084865048 (0x7c448418)
> ??????? CRC32: 00000000?? ECC: 0000
> ??????? Type: Unknown?? Attr: 0x0?? Flags: Valid System Superblock
> ??????? Dynamic Features: (0x0)
> ??????? User: 0 (root)?? Group: 0 (root)?? Size: 0
> ??????? Links: 0?? Clusters: 3496426618
> ??????? ctime: 0x4aa1e6e7 0x0 -- Fri Sep? 4 21:19:51.0 2009
> ??????? atime: 0x0 0x0 -- Wed Dec 31 16:00:00.0 1969
> ??????? mtime: 0x4aa1e6e7 0x0 -- Fri Sep? 4 21:19:51.0 2009
> ??????? dtime: 0x0 -- Wed Dec 31 16:00:00 1969
> ??????? Refcount Block: 0
> ??????? Last Extblk: 0?? Orphan Slot: 0
> ??????? Sub Alloc Slot: Global?? Sub Alloc Bit: 65535
>
> Version OCFS2 1.8.0:
> filename:
> /lib/modules/2.6.39-100.5.1.el6uek.x86_64/kernel/fs/ocfs2/ocfs2.ko
> license:??????? GPL
> author:???????? Oracle
> version:??????? 1.8.0
> description:??? OCFS2 1.8.0
> srcversion:???? A427F5E2A962D0808C8478F
> depends:??????? jbd2,ocfs2_stackglue,ocfs2_nodemanager
> vermagic:?????? 2.6.39-100.5.1.el6uek.x86_64 SMP mod_unload modversions
> mounted options: rw,_netdev,noatime,nodiratime,heartbeat=local
>
> When deleting files it seems to help temporarily. I like to be able to go
> over 82% without this degradation.
>
> I want to minimize downtime as this filesystem is 15TB. Is there a feature
I
> can enable such as "discontig-bg" that will help??
>
> Thanks so much for your help!
> -Jay