Re: Replacing SW RAID-1 with SSD RAID-1

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Backup!!!!!!!!

Von meinem iPhone gesendet

> Am 23.11.2020 um 17:10 schrieb centos@xxxxxxx:
> 
> On 23/11/2020 16:49, Frank Bures wrote:
>> On 11/23/20 10:46 AM, Simon Matter wrote:
>>>> Hi,
>>>> 
>>>> I want to replace my hard drives based SW RAID-1 with SSD's.
>>>> 
>>>> What would be the recommended procedure?  Can I just remove one drive,
>>>> replace with SSD and rebuild, then repeat with the other drive?
>>> 
>>> I suggest to "mdadm --fail" one drive, then "mdadm --remove" it. After
>>> replacing the drive you can "mdadm --add" it.
>>> 
>>> If you boot from the drives you also have to care for the boot loader. I
>>> guess this depends on how exactly the system is configured.
>> 
> If you can the new disks while the original 2 disks are still available then grow, add, wait, fail, remove, shrink. That way you will never loose redundancy...
> 
> # grow and add new disk
> 
> mdadm --grow -n 3 /dev/mdX -a /dev/...
> 
> # wait for rebuild of the array
> 
> mdadm --wait /dev/mdX
> 
> # fail old disk
> 
> mdadm --fail /dev/sdY
> 
> # remove old disk
> 
> mdadm /dev/mdX  --remove /dev/sdY
> 
> # add second disk
> 
> mdadm /dev/mdX --add /dev/...
> 
> # wait
> 
> mdadm --wait /dev/mdX
> 
> # fail and remove old disk
> 
> mdadm --fail /dev/sdZ
> 
> mdadm /dev/mdX  --remove /dev/sdZ
> 
> # shrink
> 
> mdadm  --grow -n 2 /dev/mdX
> 
> 
> 
> 
> peter
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