pdc mirror is not multipath i/o
Heinz Mauelshagen
mauelshagen at redhat.com
Thu May 12 10:02:52 UTC 2005
On Wed, May 11, 2005 at 10:23:10PM +0200, dm at chello.nl wrote:
> Hi all,
>
> My PDC dmraid configuration is running fine using dmraid, but I discovered it
> doesn't do multipath i/o:
>
> # iostat 10
> Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
> hde 100.00 1029.60 104.80 10296 1048
> hdg 2.90 0.00 104.80 0 1048
>
> hdg almost never seems to read from the disk.
>
> Could someone please tell me what I'm doing wrong?
Nothing.
The device-mapper mirror target needs enhacing to do read balancing.
>
> Greetings,
> Dick
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Regards,
Heinz -- The LVM Guy --
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Heinz Mauelshagen Red Hat GmbH
Consulting Development Engineer Am Sonnenhang 11
56242 Marienrachdorf
Germany
Mauelshagen at RedHat.com +49 2626 141200
FAX 924446
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