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Slow fsck on adaptec SAS/SATA raid



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.

-Doug

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