Yes, all disk are in single drive raid 0. Now cache is enabled for all drives, should I disable cache for SSD drives? Regards, Mateusz From: Tyler Bishop [mailto:tyler.bishop@xxxxxxxxxxxxxxxxx] You want write cache to disk, no write cache for SSD. I assume all of your data disk are single drive raid 0?
From: "Mateusz Skała" <mateusz.skala@xxxxxxxxxxx> 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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