[Lustre-discuss] thumper disk write cache patch

Herb Wartens wartens2 at llnl.gov
Thu Nov 1 11:23:10 PDT 2007


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Hi Martin,
Are you using the stock sata_mv driver that uses libata or the proprietary
marvell driver v340?  We have been using both of them, both with their fair share
of problems.  I have seen extremely poor performance from the sata_mv driver,
and the sdparm commands for turning off WCE are not honored.
With the proprietary mv_sata driver the performance is pretty good under RHEL4,
but also does not seem to honor sdparm commands for disabling WCE bit.  After doing
a little work to port this driver to RHEL5 the driver looks to be completely broken.
Currently we do not have a patch for disabling the WCE bit for either driver.
IMHO I think it would be best to try and improve the sata_mv driver in the RHEL kernel
since it seems the proprietary driver has been abandoned.
If anyone else knows of another linux project for the Marvell driver I would
be happy to hear about it.

- -Herb

Martin Gasthuber wrote:
> Hi,
> 
>    we are in the process of configuring a thumper (Sun X4500) running  
> RHEL 4.5 as an OSS/OST - for this we need a patch for the Sun-Marvell  
> driver to disable the disk write cache - did anybody has this patch ???
> 
> best regards,
>    Martin
> 
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at clusterfs.com
> https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
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