quick question about ZFS disks in a pool?

killmasta93

Member
Aug 13, 2017
537
21
23
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Hi,
I was wondering if someone could explain to me about something different with raid 10 vs raid 1 in a zfs.
when i check the disks lsblk i see this

Code:
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 931.5G  0 disk
|-sda1   8:1    0  1007K  0 part
|-sda2   8:2    0   512M  0 part
`-sda3   8:3    0   931G  0 part
sdb      8:16   0 931.5G  0 disk
|-sdb1   8:17   0  1007K  0 part
|-sdb2   8:18   0   512M  0 part
`-sdb3   8:19   0   931G  0 part
sdc      8:32   0 931.5G  0 disk
|-sdc1   8:33   0 931.5G  0 part
`-sdc9   8:41   0     8M  0 part
sdd      8:48   0 931.5G  0 disk
|-sdd1   8:49   0 931.5G  0 part
`-sdd9   8:57   0     8M  0 part
as for a raid 1 shows 3 partitions on both. but my question is how come sda and sdb are different from the others?
so if sdc gets damaged and i need to replace would i still need to install the grub? and just replicate from sdd
 

Stoiko Ivanov

Proxmox Staff Member
Staff member
May 2, 2018
2,290
237
63
Please post the output of `zpool status` - that usually shows a better picture of what is going on.

My guess is that sda and sdb are the first mirror of your raid 10 - and those contain a partition for efi and a bios-boot partition
the others have 2 disks because this is what zfs does with them if your provide a whole disk.

hope this helps!
 

killmasta93

Member
Aug 13, 2017
537
21
23
26
Thanks for the reply, this is my zpool
Code:
root@prometheus4:~# zpool status -v
  pool: rpool
 state: ONLINE
  scan: scrub repaired 0B in 4h37m with 0 errors on Fri May 31 23:47:39 2019
config:

    NAME        STATE     READ WRITE CKSUM
    rpool       ONLINE       0     0     0
      mirror-0  ONLINE       0     0     0
        sda2    ONLINE       0     0     0
        sdb2    ONLINE       0     0     0
      mirror-1  ONLINE       0     0     0
        sdc     ONLINE       0     0     0
        sdd     ONLINE       0     0     0

errors: No known data errors
So lets say sdc disk dies out and i need to replace the disk i would follow the same procedure to replace the disk including install grub?
 

Stoiko Ivanov

Proxmox Staff Member
Staff member
May 2, 2018
2,290
237
63
How did you create the pool?
just checked setting up a RAID10 with zfs and the pve-5.4-1 iso - the first mirror-vdev contains 'sda3' and 'sdb3' (both being large partitions)
 

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