Date: Sun, 7 Apr 2019 16:36:40 +0100 From: tech-lists <tech-lists@zyxst.net> To: freebsd-fs@freebsd.org Cc: freebsd-stable@freebsd.org Subject: about zfs and ashift and changing ashift on existing zpool Message-ID: <20190407153639.GA41753@rpi3.zyxst.net>
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Hello,
I have this in sysctl.conf on a desktop machine (12-stable):
vfs.zfs.min_auto_ashift=3D12
this has not always been there. I guess the zpool pre-dates it. I only
noticed it because have recently had to replace a disk in its zfs array
when I saw this:
% zpool status
pool: storage
state: ONLINE
status: One or more devices is currently being resilvered. The pool
will continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
scan: resilver in progress since Sun Apr 7 03:09:42 2019
3.46T scanned at 79.5M/s, 2.73T issued at 62.8M/s, 3.46T total
931G resilvered, 78.94% done, 0 days 03:22:41 to go
config:
NAME STATE READ WRITE CKSUM
storage ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
replacing-0 ONLINE 0 0 1.65K
ada2 ONLINE 0 0 0
ada1 ONLINE 0 0 0 block size: 512B configured, 4=
096B native
ada3 ONLINE 0 0 0
ada4 ONLINE 0 0 0
What I'd like to know is:
1. is the above situation harmful to data
2. given that vfs.zfs.min_auto_ashift=3D12, why does it still say 512B
configured for ada1 which is the new disk, or..
3. does "configured" pertain to the pool, the disk, or both
4. what would be involved in making them all 4096B
5. does a 512B disk wear out faster than 4096B (all other things being
equal)
Given that the machine and disks were new in 2016, I can't understand why z=
fs
didn't default to 4096B on installation
thanks,
--=20
J.
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