> -----Original Message-----
> From: Joel Becker [mailto:joel.bec...@oracle.com]
> Sent: Thursday, May 20, 2010 6:31 PM
> To: Ulf Zimmermann
> Cc: ocfs2-users@oss.oracle.com
> Subject: Re: [Ocfs2-users] fsck.ocfs2 using huge amount of memory?
>
> On Thu, May 20, 2010 at 06:00:19PM -0700, Ulf Zimmermann wrote:
> > We are setting up 2 new EL5 U4 machines to replace our current
> database servers running our demo environment. We use 3Par SANs and
> their snap clone options. The current production system we snap clone
> from is EL4 U5 with ocfs2 1.2.9, the new servers have ocfs2 1.4.3
> installed. Part of the refresh process is to run fsck.ocfs2 on the
> volume to recover, but right now as I am trying to run it on our 700GB
> volume it shows a virtual memory size of 21.9GB, resident of 10GB and
> it is killing the machine with swapping (24GB physical memory).
> >
> > Can anyone enlighten what is going on?
>
> How big are your filesystems? Can we get the output of
> debugfs.ocfs2 -R 'stats' /dev/xxx?
> Recent fsck.ocfs2 knows how to build its own I/O cache for
> significant speed improvements. It only tries to get as much cache as
> the filesystem actually needs, and no more than half of system memory.
> That's why I'm asking for your filesystem size - I'm guessing you have
> more than 12GB of used space on the filesystem, so fsck.ocfs2 is trying
> to grab that much cache.
dbdemo01 root /home/atcit # debugfs.ocfs2 -R 'stats' /dev/mapper/u01
Revision: 0.90
Mount Count: 0 Max Mount Count: 20
State: 0 Errors: 0
Check Interval: 0 Last Check: Sun Feb 17 12:14:33 2008
Creator OS: 0
Feature Compat: 1 backup-super
Feature Incompat: 0
Tunefs Incomplete: 0
Feature RO compat: 0
Root Blknum: 513 System Dir Blknum: 514
First Cluster Group Blknum: 256
Block Size Bits: 12 Cluster Size Bits: 20
Max Node Slots: 10
Extended Attributes Inline Size: 0
Label: /export/u01
UUID: 1543E66DCDC14370B24351676B8E4ABF
Hash: 0 (0x0)
Cluster stack: classic o2cb
Inode: 2 Mode: 00 Generation: 4081245430 (0xf342dcf6)
FS Generation: 4081245430 (0xf342dcf6)
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: 716800
ctime: 0x47b895a9 -- Sun Feb 17 12:14:33 2008
atime: 0x0 -- Wed Dec 31 16:00:00 1969
mtime: 0x47b895a9 -- Sun Feb 17 12:14:33 2008
dtime: 0x0 -- Wed Dec 31 16:00:00 1969
ctime_nsec: 0x00000000 -- 0
atime_nsec: 0x00000000 -- 0
mtime_nsec: 0x00000000 -- 0
Last Extblk: 0 Orphan Slot: 0
Sub Alloc Slot: Global Sub Alloc Bit: 65535
Also adding to bug 1255.
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