Date: Mon, 22 Sep 2014 09:14:57 -0700 From: Tim Gustafson <tjg@ucsc.edu> To: freebsd-fs@freebsd.org Subject: ZFS Warning Since Upgrade to 10.0 Message-ID: <CAPyBAS4OENwbDuqoRygQJF=RyrJJVXFgpz6qaT8vch=FO2j%2Bkw@mail.gmail.com>
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I recently upgraded a ZFS file server from 9.2 to 10.0 and then started getting this warning when I run zpool status: status: One or more devices are configured to use a non-native block size. Expect reduced performance. action: Replace affected devices with devices that support the configured block size, or migrate data to a properly configured pool. I Googled around a bit, and understand the warning, but I have a problem: that zpool is 135TB and I don't have 135TB of disks laying around, nor the controllers necessary to support an additional 135TB of disks, to migrate this zpool to a properly configured one, nor could I easily have the server off-line for the requisite time that would be required to transfer 100+ TB of data from one set of hard drives to another. So my questions are: How much will this sub-optimal configuration affect performance? Does the upgrade to 10.0 represent a reduction in performance, or was the reduction in performance always there and just not reported? This server is used to store genome data, so performance is pretty important, but the users were happy with the performance when it was a 9.2 server. If I convince the users to go through an upgrade process to fix this issue, how much of a boost in performance can they expect to see? If it's a 2% boost, I don't think I can get them to invest in the upgrade, but it it's a 100% boost, I'm pretty sure I can. -- Tim Gustafson tjg@ucsc.edu 831-459-5354 Baskin Engineering, Room 313A
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