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.bis...@beyondhosting.net] Sent: Thursday, June 11, 2015 7:30 PM To: Mateusz Skała Cc: ceph-users@lists.ceph.com Subject: Re: [ceph-users] Hardware cache settings recomendation You want write cache to disk, no write cache for SSD. I assume all of your data disk are single drive raid 0? <http://static.beyondhosting.net/img/bh-small.png> Tyler Bishop Chief Executive Officer 513-299-7108 x10 tyler.bis...@beyondhosting.net <mailto:tyler.bis...@beyondhosting.net> If you are not the intended recipient of this transmission you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited. _____ From: "Mateusz Skała" <mateusz.sk...@budikom.net <mailto:mateusz.sk...@budikom.net> > To: ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> 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 _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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