I would suggest splitting OSDs across two or more SSD journals (depending on OSD write speed and SSD sustained speed limits)
e.g 2x Intel S3700 400GB for 8-10 OSDs or 4x Intel S3500 300GB for 8-10 OSDs (it may vary depending on the setup)
If you RAID-1 SSD journals they will potentially "wear out" in the same time due to writes happening on both of them.
You only going to get journal write performance penalty with RAID-1.
Dominik
On Wed, Aug 5, 2015 at 3:37 PM, Dominik Zalewski <dzalewski@xxxxxxxxxxxxx> wrote:
I would suggest splitting OSDs across two or more SSD journals (depending on OSD write speed and SSD sustained speed limits)e.g 2x Intel S3700 400GB for 8-10 OSDs or 4x Intel S3500 300GB for 8-10 OSDs (it may vary depending on the setup)If you RAID-1 SSD journals they will potentially "wear out" in the same time due to writes happening on both of them.You only going to get journal write performance penalty with RAID-1.DominikOn Tue, Aug 4, 2015 at 10:54 PM, SUNDAY A. OLUTAYO <olutayo@xxxxxxxxxx> wrote:I am thinking of having ceph journal on a RAID1 SSD.Kindly advise me on this, does the RAID1 SSD for journal make sense?
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