Hi Peter, Sorry, I have read you post after posting a reply myself.
Peter Tribble wrote: > No. The number of spindles is constant. The snag is that for random reads, > the performance of a raidz1/2 vdev is essentially that of a single disk. (The > writes are fast because they're always full-stripe; but so are the reads.) Can you elaborate on this? My understanding is that with RAIDZ the writes are always full-stripe for as much data as can be agglomerated into a single contiguous write, but I thought this did not imply that all of the data has to be read at once except with a degraded RAID. What about for instance writing 16MB chunks and reading 8K random? Wouldn't RAIDZ access only the disks containing the 8K bits? Nils _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
