On Wed, Feb 9 at 1:44, Stan Hoeppner wrote:
maurice put forth on 2/8/2011 11:37 AM:
On 2/7/2011 1:07 PM, Roberto Spadim wrote:
hi guys, could md send TRIM command to ssd? using ext4 discart mount option?
if i mix ssd and hd, could this TRIM be rewrite to non TRIM compatible disks?
I have read that using md with SSDs is not a great idea:
Form the Fedora 14 documentation:
Using any RAID level but pure striping with SSDs is a bad idea, for the exact
reason in that documentation: excessive writes.
If I mirror two SSDs, and write 1 unit of data to the mirror, each
element of the mirror should see 1 unit of write. How does this
perform excessive writes, compared to the same workload applied to a
single SSD?
I agree that in aggregate we've now done 2 units worth of writes,
however, in a mirror case, we're protecting against both whole-device
failure and single-sector failure modes, so hardly seems like a bad
idea in all applications.
--
Eric D. Mudama
edmudama@xxxxxxxxxxxxxxxx
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
