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■ 10月21日の日記以来、だましだまし使ってきたSeagate Desktop HDD ST-4000DM000だけど、ついに

This message was generated by the smartd daemon running on:
  host name:  on-o.com
  DNS domain: on-o.com
The following warning/error was logged by the smartd daemon:
Device: /dev/sdc [SAT], 16 Offline uncorrectable sectors
Device info:
ST4000DM000-1F2168, S/N:Z3123535Z, WWN:5-000c50-026c09fdb, FW:CC54, 4.00 TB
For details see host's SYSLOG.
You can also use the smartctl utility for further investigation.
The original message about this issue was sent at Sat Jan  9 19:44:02 2021 JS
Another message will be sent in 24 hours if the problem persists.

なんてメールが来るようになって、ZFS scrubでも

ZFS has finished a scrub:
  eid: 33
class: scrub_finish
 host: on-o.com
 time: 2021-01-11 12:44:03+0900
 pool: tank
state: DEGRADED
status: One or more devices has experienced an unrecoverable error.  An
	attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
	using 'zpool clear' or replace the device with 'zpool replace'.
  see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-9P
 scan: scrub repaired 248K in 08:16:54 with 0 errors on Mon Jan 11 12:44:03 2021
config:
	NAME        STATE     READ WRITE CKSUM
	tank        DEGRADED     0     0     0
	  mirror-0  DEGRADED     0     0     0
	    sdc1    DEGRADED     7     0    14  too many errors
	    sdb1    ONLINE       0     0     0
	cache
	  sda3      ONLINE       0     0     0
errors: No known data errors

となっていて復旧不可能。HDD自体は生きているけど、不良セクターが多すぎているらしい。もう、三年半以上使っているので寿命かな。

そこで、今回こわれたHDDを入れた20017年5月31日の日記や、今回生きている、2018年11月の日記、さらにそれの前の2013年12月28日の日記でもやっている定例業務だから、手慣れたもので、HDDを新しいSeagate Barracuda ST8000DM004に換装して

# zpool replace -o ashift=12 tank 9428551599581464311 /dev/sdc1
# zpool status -v
 pool: tank
state: DEGRADED
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 Mon Jan 11 17:24:14 2021
	197G scanned at 2.95G/s, 392K issued at 5.85K/s, 2.42T total
	0B resilvered, 0.00% done, no estimated completion time
config:
	NAME                       STATE     READ WRITE CKSUM
	tank                       DEGRADED     0     0     0
	  mirror-0                 DEGRADED     0     0     0
	    replacing-0            DEGRADED     0     0     0
	      9428551599581464311  UNAVAIL      0     0     0  was /dev/sdc1/old
	      sdc1                 ONLINE       0     0     0
	    sdb1                   ONLINE       0     0     0
	cache
	  sda3                     ONLINE       0     0     0
errors: No known data errors

という感じでreplace中。

ashift=12 で4KBを明示したのは雰囲気

# zdb|grep ashift
           ashift: 12

そもそも、tankは4KBセクターだった。