[Ocfs2-users] How long for an fsck?

[Karim Alkhayer]

What is the block size? 

 

-----Original Message-----
From: ocfs2-users-bounces at oss.oracle.com
[mailto:ocfs2-users-bounces at oss.oracle.com] On Behalf Of Josep Guerrero
Sent: Thursday, April 21, 2011 4:43 PM
To: ocfs2-users at oss.oracle.com
Subject: [Ocfs2-users] How long for an fsck?

 

I have a cluster with 8 nodes, all of them running Debian Lenny (plus some
additions so multipath and Infiniband works), which share an array of 48 1TB
disks. Those disks form 22 pairs of hardware RAID1, plus 4 spares). The
first

21 pairs are organized in two striped LVM logical volumes, of 16 and 3 TB,
both formatted with ocfs2. The kernel is the version supplied with the
distribution (2.6.26-2-amd64).

 

I wanted to run an fsck on both volumes because of some errors I was getting
(probably unrelated to the filesystems, but I wanted to check). On the 3TB
volume (around 10% full) the check worked perfectly, and finished in less
than an hour (this was run with the fsck.ocfs2 provided by Lenny
ocfs2-tools, version 1.4.1):

 

==============

root at hidra0:/usr/local/src# fsck.ocfs2 -f /dev/hidrahome/lvol1 Checking
OCFS2 filesystem in /dev/hidrahome/lvol1:

  label:              <NONE>

  uuid:               ab 76 a9 41 fa df 4c ac a3 9f 26 c5 ae 34 1a 3f 

  number of blocks:   959809536

  bytes per block:    4096

  number of clusters: 959809536

  bytes per cluster:  4096

  max slots:          8

 

/dev/hidrahome/lvol1 was run with -f, check forced.

Pass 0a: Checking cluster allocation chains Pass 0b: Checking inode
allocation chains Pass 0c: Checking extent block allocation chains Pass 1:
Checking inodes and blocks.

Pass 2: Checking directory entries.

Pass 3: Checking directory connectivity.

Pass 4a: checking for orphaned inodes

Pass 4b: Checking inodes link counts.

All passes succeeded.

============

 

but the check for the second filesystem (around 40% full) did this:

 

============

hidra0:/usr/local/src# fsck.ocfs2 -f /dev/hidrahome/lvol0 Checking OCFS2
filesystem in /dev/hidrahome/lvol0:

  label:              <NONE>

  uuid:               6a a9 0e aa cf 33 45 4c b4 72 3a b6 7c 3b 8d 57

  number of blocks:   4168098816

  bytes per block:    4096

  number of clusters: 4168098816

  bytes per cluster:  4096

  max slots:          8

 

/dev/hidrahome/lvol0 was run with -f, check forced.

Pass 0a: Checking cluster allocation chains =============

 

and stayed there for 8 hours (all the time keeping one core around 100% CPU
usage and with a light load on the disks; this was consistent with the same
step in the previous run, but of course it didn't take so long). I thought
that maybe I had run into some bug, so I interrupted the process, downloaded
ocfs2-tools 1.4.4 sources, compiled them, and tried with that fsck,
obtaining similar results, since it's been running for almost 7 hours like
this:

 

=============

hidra0:/usr/local/src/ocfs2-tools-1.4.4/fsck.ocfs2# ./fsck.ocfs2 -f

/dev/hidrahome/lvol0

fsck.ocfs2 1.4.4

Checking OCFS2 filesystem in /dev/hidrahome/lvol0:

  Label:              <NONE>

  UUID:               6AA90EAACF33454CB4723AB67C3B8D57

  Number of blocks:   4168098816

  Block size:         4096

  Number of clusters: 4168098816

  Cluster size:       4096

  Number of slots:    8

 

/dev/hidrahome/lvol0 was run with -f, check forced.

Pass 0a: Checking cluster allocation chains

 

=============

 

and with one core CPU at 100%. 

 

Could someone tell me if this is normal? I've been searching the web and
checking manuals for information on how long this checks should take, and
apart from one message in this list mentioning that 3 days in a 8 TB
filesystem with 300 GB was too long, I haven't been able to find anything. 

 

If this is normal, is there any way to estimate, taking into account that
the first filesystem uses exactly the same disks and took less than an hour
to check, how long it should take for this other filesystem?

 

Thanks!

 

Josep Guerrero

 

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