[zfs-discuss] ZFS on solid state as disk rather than L2ARC...
Has anyone done much testing of just using the solid state devices (F20 or F5100) asdevices for ZFS pools? Are there any concerns with running in this mode versus usingsolid state devices for L2ARC cache?Second, has anyone done this sort of testing with MLC based solid state drives?What has your experience been?Thanks in advance!BradBrad Diggs | Principal Security Sales ConsultantOracleNorth America Technology Organization16000 Dallas Parkway, Dallas, TX 75248Tech Blog:http://TheZoneManager.comLinkedIn:http://www.linkedin.com/in/braddiggs ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] ZFS on solid state as disk rather than L2ARC...
We actually did some pretty serious testing with SATA SLCs from Sun directly hosting zpools (not as L2ARC). We saw some really bad performance - as though there were something wrong, but couldn't find it. If you search my name on this list you'll find the description of the problem. --m m a t tc o w g e r sr. systems engineer | internal services / techops salesforce.com +1 206 262 8078 (office) +1 415 401 5930 (mobile) mattkcowger (aim | yahoo) From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-boun...@opensolaris.org] On Behalf Of Brad Diggs Sent: Wednesday, September 15, 2010 12:27 PM To: zfs-discuss@opensolaris.org Subject: [zfs-discuss] ZFS on solid state as disk rather than L2ARC... Has anyone done much testing of just using the solid state devices (F20 or F5100) as devices for ZFS pools? Are there any concerns with running in this mode versus using solid state devices for L2ARC cache? Second, has anyone done this sort of testing with MLC based solid state drives? What has your experience been? Thanks in advance! Brad [cid:image001.png@01CB54D6.1F2EB3C0] Brad Diggs | Principal Security Sales Consultant Oracle North America Technology Organization 16000 Dallas Parkway, Dallas, TX 75248 Tech Blog: http://TheZoneManager.comhttp://TheZoneManager.com/ LinkedIn: http://www.linkedin.com/in/braddiggs inline: image001.png___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] ZFS on solid state as disk rather than L2ARC...
On Wed, Sep 15, 2010 at 12:27 PM, Brad Diggs brad.di...@oracle.com wrote: Has anyone done much testing of just using the solid state devices (F20 or F5100) as devices for ZFS pools? Are there any concerns with running in this mode versus using solid state devices for L2ARC cache? Depending on the configuration (raidz vs. mirror) you can wind up issuing unaligned writes. Current SSDs work best when writes are aligned on a 4k boundary, which raidz won't always do. -B -- Brandon High : bh...@freaks.com ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] ZFS on solid state as disk rather than L2ARC...
14x 256gb MLC SSDs in a raidz2 array have worked fine for us. Performace seems to be mostly limited by the raid controller in operating in JBOD mode. Raidz2 allows sufficient redundancy to replace any MLC drives that develop issues and when you have that many consumer level SSDs, some will develop issues until you get all the weak ones weeded out. If I had more space in the box or didn't need quite as much space I would have split the array into 2 or more striped raidz2 arrays. Your mileage may vary. -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
