Hi Chris, It sounds like there is some confusion with the recommendation about raidz? vdevs. It is recommended that each raidz? TLD be a "single-digit" number of disks - so up to 9. The total number of these single digit TLDs is not practically limited.
Craig Christopher White wrote: > Cindy -- > > Thanks for the link! > > I see in one of the examples that there are 14 TLDs (all mirrored). Does > that mean there are no performance issues with having more than 9 TLDs? In > the Sun class I attended, the instructor said to not use more than 9 TLDs, > which seems like it could be very limiting, especially in a SAN setting. > Like I said, our storage group presents 15G LUNs to use -- so it'd be > difficult to keep the TLDs under 9 and have a very large filesystem. > > Let me know what you think. Thanks! > > Chris > > > > On Tue, Dec 1, 2009 at 10:47 AM, Cindy Swearingen > <cindy.swearin...@sun.com>wrote: > >> Hi Chris, >> >> If you have 40 or so disks then you would create 5-6 RAIDZ virtual >> devices of 7-8 disks each, or possibly include two disks for the root >> pool, two disks as spares, and then 36 (4 RAIDZ vdevs of 6 disks) disks >> for a non-root pool. >> >> This configuration guide hasn't been updated for RAIDZ-3 yet, but you >> will get some ideas about how to configure a redundant configuration >> of many disks, here: >> >> http://www.solarisinternals.com/wiki/index.php/ZFS_Configuration_Guide >> >> See ZFS Configuration Example (x4500 with raidz2) >> >> Cindy >> >> >> On 12/01/09 09:20, Christopher White wrote: >> >>> All, >>> >>> We're going to start testing ZFS and I had a question about Top Level >>> Devices (TLDs). In Sun's class, they specifically said not to use more >>> than >>> 9 TLDs due to performance concerns. Our storage admins make LUNs roughly >>> 15G in size -- so how would we make a large pool (1TB) if we're limited to >>> only 9 TLDs? >>> >>> The Best Practices guide ( >>> http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#Storage_Pool_Performance_Considerations) >>> suggests not using 40+ disks in a RAIDZ TLD: >>> >>> "Avoid creating a RAIDZ, RAIDZ-2, RAIDZ-3, or a mirrored configuration >>> with one logical device of 40+ devices. See the sections below for examples >>> of redundant configurations." >>> >>> Does that mean we should only have 9 RAIDZ TLDs with 39 LUNs in each >>> RAIDZ? >>> >>> Or is the 9 TLDs an old recommendation that has since been changed? >>> >>> Thanks! >>> >>> Chris >>> >>> >>> ------------------------------------------------------------------------ >>> >>> _______________________________________________ >>> zfs-discuss mailing list >>> zfs-discuss@opensolaris.org >>> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >>> >> > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > -- Craig Cory Senior Instructor :: ExitCertified : Sun Certified System Administrator : Sun Certified Network Administrator : Sun Certified Security Administrator : Veritas Certified Instructor 8950 Cal Center Drive Bldg 1, Suite 110 Sacramento, California 95826 [e] craig.c...@exitcertified.com [p] 916.669.3970 [f] 916.669.3977 [w] WWW.EXITCERTIFIED.COM +---------------------------------------------------------------------+ OTTAWA | SACRAMENTO | MONTREAL | LAS VEGAS | QUEBEC CITY | CALGARY SAN FRANCISCO | VANCOUVER | REGINA | WINNIPEG | TORONTO _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
