Re: unusual ZFS issue

From: Lexi Winter <lexi_at_le-fay.org>
Date: Thu, 14 Dec 2023 22:46:14 UTC
On 14 Dec 2023, at 22:35, Xin LI <delphij@gmail.com> wrote:
> This is strange, I'd expect some non-zero values above; did you 'zpool clear' before this?

i did not.  i was also surprised at encountering this error with no device or vdev errors.

> You can delete these files or datasets and restore them from backup. 

unfortunately, i cannot:

# zfs destroy -r data/vm/media/disk1
cannot iterate filesystems: I/O error

# zfs list -rt all data/vm/media/disk1
cannot iterate filesystems: I/O error
NAME                                                       USED  AVAIL  REFER  MOUNTPOINT
data/vm/media/disk1                                       9.32G  27.6T  6.47G  -
data/vm/media/disk1@autosnap_2023-12-13_12:00:00_hourly      0B      -  6.42G  -
data/vm/media/disk1@autosnap_2023-12-14_10:16:00_hourly      0B      -  6.46G  -
data/vm/media/disk1@autosnap_2023-12-14_11:17:00_hourly      0B      -  6.46G  -
data/vm/media/disk1@autosnap_2023-12-14_12:04:00_monthly     0B      -  6.46G  -
data/vm/media/disk1@autosnap_2023-12-14_12:15:00_hourly      0B      -  6.46G  -
data/vm/media/disk1@autosnap_2023-12-14_13:14:00_hourly      0B      -  6.46G  -
data/vm/media/disk1@autosnap_2023-12-14_14:38:00_hourly      0B      -  6.46G  -
data/vm/media/disk1@autosnap_2023-12-14_15:11:00_hourly      0B      -  6.46G  -
data/vm/media/disk1@autosnap_2023-12-14_17:12:00_hourly    316K      -  6.47G  -
data/vm/media/disk1@autosnap_2023-12-14_17:29:00_daily    2.70M      -  6.47G  -

> If you are not using ECC memory, they may occasionally cause damage like this one if you are really unlucky, by the way.

this system does have ECC memory, but it’s on an AM4 platform, which has limited support for ECC.

	thanks, liss.