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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