Re: device in raidz2 array only partially recognised by the OS

Reply: void : "Re: device in raidz2 array only partially recognised by the OS"
In reply to: void : "device in raidz2 array only partially recognised by the OS"
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From: Alan Somers <asomers_at_freebsd.org>
Date: Thu, 26 Jun 2025 14:15:02 UTC

On Thu, Jun 26, 2025 at 8:10 AM void <void@f-m.fm> wrote:

> (posted to both -current and -fs because am unsure which is more relevant)
>
> On a machine running GENERIC-NODEBUG amd64 1500026 1500026 FreeBSD
> 15.0-CURRENT #0 main-
> n273486-88dd0550920c, a disk in the raidz2 array dropped out and is no
> longer recognised by
> the OS in terms of zfs but *is* recognised by smartctl. I've tried
> onlining the device but
> it says it can't find /dev/da7. The array is connected in HBA mode to a
> HP Smart Array P440 Controller. The disk dropped out of the array after
> an extended power outage.
>
> zpool status:
>
>    NAME                    STATE     READ WRITE CKSUM
>    data                    DEGRADED     0     0     0
>      raidz2-0              DEGRADED     0     0     0
>        da1                 ONLINE       0     0     0
>        da2                 ONLINE       0     0     0
>        da3                 ONLINE       0     0     0
>        da4                 ONLINE       0     0     0
>        da5                 ONLINE       0     0     0
>        da6                 ONLINE       0     0     0
>        114031416858974629  UNAVAIL      0     0     0  was /dev/da7
>
> da0 is the boot disk and is not part of the array. It's not a root-on-zfs.
>
> smartctl:
>
> doas smartctl -x -d cciss,7 /dev/ciss0
>
> smartctl 7.4 2023-08-01 r5530 [FreeBSD 15.0-CURRENT amd64] (local build)
> Copyright (C) 2002-23, Bruce Allen, Christian Franke,
> www.smartmontools.org
>
> === START OF INFORMATION SECTION ===
> Vendor:               SEAGATE
> Product:              ST4000NM0023
> Revision:             A001
> Compliance:           SPC-4
> User Capacity:        4,000,787,030,016 bytes [4.00 TB]
> Logical block size:   512 bytes
> LU is fully provisioned
> Rotation Rate:        7200 rpm
> Form Factor:          3.5 inches
>
> (etc etc)
>
> There are no relevant errors in the iLo. How can I make the zpool see the
> disk again?


Does the /dev/da7 device node exist?  If not, does "camcontrol rescan all"
bring it back?  If it does exist, can it be read from?  Does smartctl
report any errors?  Does "zdb -l /dev/da7" show a ZFS label?