From Single disk RAID-0 ZFS to RAID-1

[emanuelebruno]

Hi,
according to my post, this italian translation is for you:

Having the need to purchase a second 8-TB disk and put it in RAID-1 on a already working system consisting of only one RAID 0 disk, I wanted to write this step-by-step guide hoping to be of help to someone. First, let's repeat the steps written in the previous guide:

sgdisk --replicate=/dev/sdb /dev/sda
sgdisk --randomize-guids /dev/sdb
grub-install /dev/sdb

To add the second disk to the existing pool and to have a RAID-1perfectly working, I had to type the following command:

zpool attach rpool pci-0000:00:10.0-scsi-0:0:0:0-part2 /dev/sdb

At the end of the operation and after a reboot, the system will be fully functional:



Best regards,
Emanuele Bruno

 

[Alessandro 123]

You don't need to reboot
Additionally, you have to install grub even on the newly added disk or in case of first disk failure, your system won't boot anymore

 

[udo]

Hi,
...

sgdisk --replicate=/dev/sdb /dev/sda
sgdisk --randomize-guids /dev/sdb
grub-install /dev/sdb

To add the second disk to the existing pool and to have a RAID-1perfectly working, I had to type the following command:

zpool attach rpool pci-0000:00:10.0-scsi-0:0:0:0-part2 /dev/sdb

...

Hi,
why you copy the partitiontable first, but then add the whole disk and not part2 also (sdb2)?
Is this correct?

Udo

 

[emanuelebruno]

[...]you have to install grub even on the newly added disk[...]

Hi Alessandro,
if you take a better look to my post, you'll see that I have written this code:

[...]
grub-install /dev/sdb

 

[emanuelebruno]

[...]
why you copy the partitiontable first[...]?
Is this correct?

Udo

Hi Udo,
you can find your answer in this link.

 

[Alessandro 123]

Hi Alessandro,
if you take a better look to my post, you'll see that I have written this code:

[...]
grub-install /dev/sdb

Yes, sorry ,my mistake

 

[guletz]

Hi,
why you copy the partitiontable first, but then add the whole disk and not part2 also (sdb2)?
Is this correct?

Hi,

Udo you are wright. It is a non-sense to copy the partion layout, and then to add the new disk to the pool(and not a partition, sdb2) !

I also read your tutorial(I can undestand some words .... not all). As a observation, the best test for the new HDD that will be add to a pool, would be(my opinion):

FOR J=1,N

smartctl -t long /dev/sdX

badblocks -c 10240 -s -w -t random -v /dev/sdaX

NEXT J

- badblock will write random data to the disk, and then it will read the same data , in case of write data != read data, this is a bad disk(very probably)

- adjust N as you wish(I use 5 in most of the cases)

 

[enoch85]

Here's another explanation: https://www.reddit.com/r/Proxmox/co...?utm_source=reddit&utm_medium=web2x&context=3