[CentOS] 3ware performance in CentOS

Joshua Baker-LePain jlb17 at duke.edu
Fri Jun 20 17:05:18 UTC 2008

On Fri, 20 Jun 2008 at 9:55am, Florin Andrei wrote

> Florin Andrei wrote:
>> Anyway, I did a test with the 2.6.18-93.el5.bz444759 kernel and there's no 
>> difference: 65 minutes, 27 MB/s. Looks like it doesn't matter which kernel 
>> I use, at least for this simple test with dd.
>> I wonder if a test closer to real life, such as reading/writing stuff 
>> from/to MySQL, would produce different results. I guess there's only one 
>> way to find out. ;-)
> As a side note, the artificial benchmark reveals a huge difference between 
> Ext3 and XFS - the latter is much faster when writing. Might be an artifact 
> of some setting (after all, I do use a hardware RAID card). But the 
> difference is very real.
> I was planning to use XFS anyway, so I'm not sure if I'll spend too much time 
> troubleshooting Ext3.
> I don't think this is some kind of hidden effect of the MWI bug.

XFS has *always* been faster on 3ware than ext3.  RH has never been 
interested in looking at why.  *shrug*

Joshua Baker-LePain
QB3 Shared Cluster Sysadmin

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