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Old 12-17-2006, 04:26 PM   #1
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Registered: Dec 2006
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Unhappy Extremely slow disk read access software raid 5


I've just installed a box with Fedora Core 6, using the install program
to setup raid 5 over 3 disks, cele...@1.7ghz.

Now, the read access is descent unbuffered (apx 95mb/s with hdparm). It
feels fairly fast in most operations, but some are dreadfully slow.

For example:
* Copying a directory containig 100 files with cp to the same partition
only takes a whiff.
* Doing the same thing with MC and it only seems to copy one file per
* FTP Uploading a file to the box - about 10MB/s, Downloading from it
about 3kB/s.

It's the actual disk read that takes forever using some programs. It's
as if some progs use a special way of reading files that doesn't at all
go well with my disk setup.

It only seems to be when reading, but I havn't tested this that much.

Anyone have any ideas?

Running hdparm gives me this:

Timing cached reads: 3032 MB in 2.00 seconds = 1515.26 MB/sec
Timing buffered disk reads: 124 MB in 1.79 seconds = 69.41 MB/sec

It's the same for sdb1 and sdc1 aswell. Looks pretty good, doesn't it?

So I'm confused.

Last edited by Magsimoe; 12-17-2006 at 05:11 PM.
Old 12-18-2006, 10:49 AM   #2
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Registered: Jul 2004
Location: Phoenix, Arizona
Distribution: Gentoo, LFS, Debian,Ubuntu
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Do your partitions span physical disks? Like are you using local volumes. If so maybe its something with the raid driver instead of something with the disks.
Old 12-18-2006, 04:59 PM   #3
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Registered: Dec 2006
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Finally found out what was wrong. It had nothing to do with the disks, what so ever.. It was because of the NIC - Attansic L1.

All I had to do was to disable TSO and it works like a charm.


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