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Re: Running slower after raid0

On Tue, 2005-11-01 at 11:05 -0200, Bruno Diniz wrote:
> Hi all,
> I have a system with two S-ATA hard disks and I configured raid0 with
> them using mdadm. Each HD has 200GB of capacity. What is weird is that
> after configuring the raid, the newly created device (/dev/md0) is
> slower than each of the disks individually. Look at the numbers:
> cat /etc/mdadm/mdadm.conf
> DEVICE partitions
> ARRAY /dev/md1 level=raid0 num-devices=2
> UUID=b659b438:39b787dc:02f341ed:480bddf3
>    devices=/dev/sdc3,/dev/sdd2
> ARRAY /dev/md0 level=raid0 num-devices=2
> UUID=4d999bad:c9c3cf0e:91fd35b1:57f5529c
>    devices=/dev/sda1,/dev/sdb1
> The /dev/md1 array is working correctly, and its bandwidth is twice as
> much as each individual disk bw. The only difference between md0 and
> md1 is their capacity and that md0 is formatted with XFS, while md1
> uses Reiserfs.
> What could be the problem? Could it be XFS?

I'd make the partitions as exactly alike as possible, including
the filesystems.

Ron Johnson, Jr.
Jefferson, LA USA
PGP Key ID 8834C06B I prefer encrypted mail.

"It's springtime for Hitler, and Germany..."

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