Date: Thu, 27 May 2021 11:32:27 -0700 From: joe mcguckin <joe@via.net> To: freebsd-fs <freebsd-fs@freebsd.org> Subject: Upsizing a ZFS filesystem - shift question Message-ID: <BF3CEC2C-2DEB-424A-97B8-2D35FDEEFD18@via.net>
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I have an existing 32TB filesystem (2 X 8T vdevs). I want to upgrade each of the drives to 16TB. I pulled one drive and tried a ‘zfs replace’ comand, but zfs replied with some message about new drive optimal ashift doesn’t match the vdev. It suggested Retrying the ‘replace’ command with ‘zfs replace -o ashift=N’ Ok, a little investigation shows the existing filesystem has an ashift of 9. These are older 2T drives with 512 byte sectors. The newer drives are 4kn sectors. Is ashift settable on a drive by drive basis? Can I temporarily set ashift on a drive until all the drives in a vdev have been replaced? Once all drives have been replaced, how do I set ashift=12 for all the drives in the vdev? After replacing all the drives, will the additional space magicially appear or is there an additional command or series of steps? Thanks, Joe Joe McGuckin ViaNet Communications joe@via.net 650-207-0372 cell 650-213-1302 office 650-969-2124 faxhome | help
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