[SOLVED] Detach Disk from RaidZ1

[adminkc]

Hi,

does somebody have experience with detaching the disk from an rpool with RaidZ1?

Best

 

[AKA]

As far as i know a detach is only possible in a mirrored zpool.

You can take the disk offline with "zpool offline"

 

[adminkc]

I found this already with zpool offline but can i put the disk now out and replace it with a new disk.
Can I after that put the new disk in and set it online again?

 

[AKA]

You need to take the disk offline, replace it with a new disk and then run:
zpool replace OLDDISK NEWDISK POOL

As seen here: https://docs.oracle.com/cd/E19253-01/819-5461/gazgd/index.html

 

[adminkc]

but how the system check the hdd name.
if the broken disk is sdb for example how the system check when i put the new disk in, that the new disk is again sdb or does he give the hdd a new name?

 

[AKA]

You can check the newly attached disk with "dmesg".

It should show you the old disk disconnecting and the new one connecting and show you the new device name.

But you shouldn't use /dev/sd* names. Better is to go with the disks uuid.
Another methode is to execute:
ls -l /dev/disk/by-uuid/

after removing the disk. Then inserting the new one, run the command again and see which entry is new.

Then run zpool replace OLDDISK /dev/disk/by-uuid/NEWDISKUUID POOLNAME

But be careful not to replace it with another active disk or you will actively destroy your ZPOOL

 

[adminkc]

Perfect!!

Thank you for your help, I will try this.

 

[adminkc]

After i put the new disk in do I need to format it to get the blkid of the new disk?

 

[AKA]

Hi, no, you should see it right away. zpool will warn you if theres another filesystem on the disk.

 

[adminkc]

But I can't get the blkid of the new disk?
if i write blkid /dev/sdd they show me nothing

 

[AKA]

Maybe it is not /dev/sdd.

Like i said, please check dmesg.

 

[adminkc]

Here is the dmesg but I also see here nothing

 

[AKA]

Just do:

ls -l /dev/disk/by-uuid/ | grep sdd

and you will see the UUID of the disk.

then run

zpool replace OLDDISK /dev/disk/by-uuid/NEWDISKUUID POOLNAME

like i said.

 

[adminkc]

nothing is happening

 

[AKA]

Whoops sorry, i meant

ls -l /dev/disk/by-id/ | grep sdd

My mistake.

 

[adminkc]

Now I get this

 

[AKA]

Can you give me the output of "zpool status"?

 

[adminkc]

sdd is offline because I changend the disks

 

[AKA]

Then just execute

zpool replace rpool sdd /dev/disk/by-id/scsi-35000c500d34f804f

 

[adminkc]

what is the old disk (ssd?)