Slow fsck on adaptec SAS/SATA raid

Eric Sandeen sandeen at
Fri Jan 22 20:01:48 UTC 2010

Doug Warner wrote:
> I'm trying to do an fsck on an ext3 partition but I'm seeing abysmally slow
> disk throughput; monitoring with "dstat" (like vmstat) shows ~1200-1500KB/s
> throughput to the disks.  Even with 24hrs of fsck-ing I only get ~3% (still in
> pass1).
> The filesystem is ext3 running "e2fsck -C0 /dev/sda3" and about 3.7TB on an
> x86_64-based system with 4GB RAM.  e2fsprogs is 1.41.9.
> During initial periods of the fsck I see throughput in the 30-70MB/s range
> (ie, <0.4% complete).  Shortly after that throughput tanks and stays there.
> Just a rough extrapolation of the size of my filesystem (3.4TB used; ~95%)
> makes it look like this will take ~28 days to complete.  I'm using approx 12M
> inodes out of my 243M available.

It'd be interesting to use blktrace and/or seekwatcher to see if you are seeking
madly all over the disk, that would certainly clobber perf.

> -Doug

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