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Zpool drive replacement help (self.zfs)

submitted 1 year ago by mrtoast72 to c/zfs

8 comments fedilink hide all child comments

Good day everyone, I need some help with my zpool I created a long time ago. I have 8 Drives in a Z1 raid, each are 3Tb Seagate 7200rpm SAS drives. A couple of weeks ago I had a drive start trowing some errors after going strong for almost 4 years so I quickly replaced it with a spare I had just ordered in. I wasn't totally sure what commands to run so I looked around on a few forums and on the zfs wiki as well and found it would be a simple few commands:

sudo zpool offline TheMass 9173635512214770897

sudo zpool labelclear /dev/sdc

sudo zpool replace TheMass 9173635512214770897 /dev/sdc

As Context here is my lsblk output:

sda 8:0 0 2.7T 0 disk
└─md124 9:124 0 2.7T 0 raid0 ├─md124p1 259:11 0 2G 0 part
└─md124p2 259:12 0 2.7T 0 part
sdb 8:16 0 2.7T 0 disk
└─md121 9:121 0 2.7T 0 raid0 ├─md121p1 259:17 0 2G 0 part
│ └─md116 9:116 0 2G 0 raid1 └─md121p2 259:18 0 2.7T 0 part
sdc 8:32 0 2.7T 0 disk
├─sdc1 8:33 0 2.7T 0 part
└─sdc9 8:41 0 8M 0 part
sdd 8:48 0 2.7T 0 disk
└─md125 9:125 0 2.7T 0 raid0 ├─md125p1 259:9 0 2G 0 part
└─md125p2 259:10 0 2.7T 0 part
sde 8:64 0 2.7T 0 disk
└─md120 9:120 0 2.7T 0 raid0 ├─md120p1 259:19 0 2G 0 part
└─md120p2 259:20 0 2.7T 0 part
sdf 8:80 0 2.7T 0 disk
└─md123 9:123 0 2.7T 0 raid0 ├─md123p1 259:13 0 2G 0 part
│ └─md117 9:117 0 2G 0 raid1 └─md123p2 259:14 0 2.7T 0 part
sdg 8:96 0 2.7T 0 disk
└─md122 9:122 0 2.7T 0 raid0 ├─md122p1 259:15 0 2G 0 part
│ └─md116 9:116 0 2G 0 raid1 └─md122p2 259:16 0 2.7T 0 part
sdh 8:112 0 2.7T 0 disk
└─md119 9:119 0 2.7T 0 raid0 ├─md119p1 259:21 0 2G 0 part
│ └─md117 9:117 0 2G 0 raid1 └─md119p2 259:22 0 2.7T 0 part

I removed the old sdc drive, and replaced it with a new one and then ran those commands, The pool began to re-silver and I thought everything was alright until I noticed the new sdc drive didn't have all the other formatting on it like the other drives, and my performance isn't what it use to be. My pool is up and running given zpool status:

`pool: TheMass state: ONLINE scan: scrub repaired 0B in 03:47:04 with 0 errors on Fri Oct 6 20:24:26 2023 checkpoint: created Fri Oct 6 22:14:02 2023, consumes 1.41M config:

NAME                        STATE     READ WRITE CKSUM
TheMass                     ONLINE       0     0     0
  raidz1-0                  ONLINE       0     0     0
    md124p2                 ONLINE       0     0     0
    scsi-35000c500562bfc4b  ONLINE       0     0     0
    md119p2                 ONLINE       0     0     0
    md121p2                 ONLINE       0     0     0
    md122p2                 ONLINE       0     0     0
    md123p2                 ONLINE       0     0     0
    md125p2                 ONLINE       0     0     0
    md120p2                 ONLINE       0     0     0`

So my question is, did I do this correctly? if not, what and where did I go wrong so I can fix this? Also, if you could give me the commands that I would need, that would be amazing!

If theres any other commands you need me to run for information just let me know!

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[–] calamityjanitor 1 points 1 year ago (1 children)

Huh annoying. You can run zdb -C TheMass To get more info about the pool and the disks in it. Might list enough disk detail to give you confidence it's using the layout you want.

For me identifying disks usually ends up being unplugging them one by one and checking which shows OFFLINE. Could be worth the trouble to know for sure its specifying and using the disks.

In any case a good time to setup a backup for anything you can't replace.

[–] mrtoast72 2 points 1 year ago

Yeah that’s what I’m thinking of doing now, backup everything important just in case and continue to work on it.

Thankfully I can identify any disk rather easily with the command you mentioned (used it before to grab a drives serial number which is printed on the drive its self).