Hum the Crucial m500 is pretty slow. The biggest one doesn’t even reach 300MB/s. Intel DC S3700 100G showed around 200MB/sec for us.
Actually, I don’t know the price difference between the crucial and the intel but the intel looks more suitable for me. Especially after Mark’s comment. –––– Sébastien Han Cloud Engineer "Always give 100%. Unless you're giving blood.” Phone: +33 (0)1 49 70 99 72 Mail: sebastien....@enovance.com Address : 10, rue de la Victoire - 75009 Paris Web : www.enovance.com - Twitter : @enovance On 15 Jan 2014, at 15:28, Mark Nelson <mark.nel...@inktank.com> wrote: > On 01/15/2014 08:03 AM, Robert van Leeuwen wrote: >>> Power-Loss Protection: In the rare event that power fails while the >>> drive is operating, power-loss protection helps ensure that data isn’t >>> corrupted. >> >> Seems that not all power protected SSDs are created equal: >> http://lkcl.net/reports/ssd_analysis.html >> >> The m500 is not tested but the m4 is. >> >> Up to now it seems that only Intel seems to have done his homework. >> In general they *seem* to be the most reliable SSD provider. > > Even at that, there has been some concern on the list (and lkml) that certain > older Intel drives without super-capacitors are ignoring ATA_CMD_FLUSH, > making them very fast (which I like!) but potentially dangerous (boo!). The > 520 in particular is a drive I've used for a lot of Ceph performance testing > but I'm afraid that if it's not properly handling CMD FLUSH requests, it may > not be indicative of the performance folks would see on other drives that do. > > On the third hand, if drives with supercaps like the Intel DC S3700 can > safely ignore CMD_FLUSH and maintain high performance (even when there are a > lot of O_DSYNC calls, ala the journal), that potentially makes them even more > attractive (and that drive already has relatively high sequential write > performance and high write endurance). > >> >> Cheers, >> Robert van Leeuwen >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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