Re: Performance problems with Seagate Barracuda ES.2 harddisks

[Matthias Scheler <tron%zhadum.org.uk@localhost>]

On Tue, Jul 08, 2008 at 05:21:54AM +0000, Michael van Elst wrote:
> >> I've recently added two Seagate Barracuda ES.2 SATA harddisk. They work
> >> fine but the filesystem performance is very poor.
> 
> Wouldn't that suggest that the filesystem is the problem?

Maybe. But why? I tried to avoid that by creating small filesystems
on the new harddisks.

> You may want to retry the dd read and write tests with a much
> smaller block size.

Here are the results:

tron@lyssa:~#dd if=/dev/zero of=/dev/rwd1d bs=512 count=4194304
4194304+0 records in
4194304+0 records out
2147483648 bytes transferred in 416.896 secs (5151125 bytes/sec)
tron@lyssa:~#dd of=/dev/null if=/dev/rwd1d bs=512 count=4194304
4194304+0 records in
4194304+0 records out
2147483648 bytes transferred in 255.728 secs (8397530 bytes/sec)

tron@lyssa:~#dd of=/dev/null if=/dev/rwd0d bs=512 count=4194304
4194304+0 records in
4194304+0 records out
2147483648 bytes transferred in 330.759 secs (6492593 bytes/sec)

This again suggests that the new harddisks are faster than the old one.

        Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/