Re: SSD for Centos SWAP /tmp & /var/ partition

[Ray Van Dolson <rayvd@xxxxxxxxxxxx>]

On Mon, May 23, 2011 at 02:29:22PM -0500, Robert Nichols wrote:
> On 05/23/2011 01:44 PM, Jerry Franz wrote:
> >
> > But, for paranoia's sake, I would RAID1 the SSD with a second SSD.
> >
> 
> Quote from 
> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/newmds-ssdtuning.html 
> :
> 
>     Red Hat also warns that software RAID levels 1, 4, 5, and 6 are not
>     recommended for use on SSDs. During the initialization stage of these
>     RAID levels, some RAID management utilities (such as mdadm) write to
>     all of the blocks on the storage device to ensure that checksums
>     operate properly. This will cause the performance of the SSD to degrade
>     quickly.
> 

Huh.  Maybe LVM mirroring would be alright.

Ray
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