On Thu, Jun 16, 2011 at 09:15:44PM -0400, Edward Ned Harvey wrote: > My personal preference, assuming 4 disks, since the OS is mostly reads and > only a little bit of writes, is to create a 4-way mirrored 100G partition > for the OS, and the remaining 900G of each disk (or whatever) becomes either > a stripe of mirrors or raidz, as appropriate in your case, for the > storagepool.
Is it still the case, as it once was, that allocating anything other than whole disks as vdevs forces NCQ / write cache off on the drive (either or both, forget which, guess write cache)? If so, can this be forced back on somehow to regain performance when known to be safe? I think the original assumption was that zfs-in-a-partition likely implied the disk was shared with ufs, rather than another async-safe pool. -- Dan.
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