WYT said: Hi all,
My company will be acquiring the Sun SE6920 for our storage virtualization project and we intend to use quite a bit of ZFS as well. The 2 technologies seems somewhat at odds since the 6920 means layers of hardware abstraction but ZFS seems to prefer more direct access to disk. I tried to search around but couldn't find any performance numbers of ZFS on SE6920 nor any recommendations where to start or what the considerations could be. Will appreciate any hints in this area. Thanks. -- Just me, Wire ... _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss My general principles are: If you can, to improve you 'Availability' metrics, let ZFS handle one level of redundancy; For Random Read performance prefer mirrors over raid-z. If you use raid-z, group together a smallish number of volumes. setup volumes that correspond to small number of drives (smallest you can bear) with a volume interlace that is in the [1M-4M] range. And next, a very very important thing that we will have to pursue with Storage Manufacturers including ourself: In cases where the storage cache is to be considered "stable storage" in the face of power failure, we have to be able to configure the storage to ignore the "flush write cache" commands that ZFS issues. Some Storage do ignore the flush out of the box, others don't. It should be easy to verify the latency of a small O_DSYNC write. On a quiet system, I expect sub millisec response. 5ms to a battery protected cache should be red-flagged. This was just filed to track the issue: 6460889 zil shouldn't send write-cache-flush command to <some> devices Note also that S10U2 has already been greatly improved performance wise, tracking releases is very important. -r ____________________________________________________________________________________ Performance, Availability & Architecture Engineering Roch Bourbonnais Sun Microsystems, Icnc-Grenoble Senior Performance Analyst 180, Avenue De L'Europe, 38330, Montbonnot Saint Martin, France http://icncweb.france/~rbourbon http://blogs.sun.com/roller/page/roch [EMAIL PROTECTED] (+33).4.76.18.83.20 _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
