You want write cache to disk, no write cache for SSD.
I assume all of your data disk are single drive raid 0?
Tyler Bishop
Chief Executive Officer
513-299-7108 x10
[email protected]
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From: "Mateusz Skała" <[email protected]>
To: [email protected]
Sent: Saturday, June 6, 2015 4:09:59 AM
Subject: [ceph-users] Hardware cache settings recomendation
Hi,
Please help me with hardware cache settings on controllers for ceph rbd best
performance. All Ceph hosts have one SSD drive for journal.
We are using 4 different controllers, all with BBU:
· HP Smart Array P400
· HP Smart Array P410i
· Dell PERC 6/i
· Dell PERC H700
I have to set cache policy, on Dell settings are:
· Read Policy
o Read-Ahead (current)
o No-Read-Ahead
o Adaptive Read-Ahead
· Write Policy
o Write-Back (current)
o Write-Through
· Cache Policy
o Cache I/O
o Direct I/O (current)
· Disk Cache Policy
o Default (current)
o Enabled
o Disabled
On HP controllers:
· Cache Ratio (current: 25% Read / 75% Write)
· Drive Write Cache
o Enabled (current)
o Disabled
And there is one more setting in LogicalDrive option:
· Caching:
o Enabled (current)
o Disabled
Please verify my settings and give me some recomendations.
Best regards,
Mateusz
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