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
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