Re: Need help increasing raid scan efficiency.

[Reindl Harald <h.reindl@thelounge.net>]

Am 03.06.25 um 22:04 schrieb David Niklas:
> On Tue, 3 Jun 2025 17:46:01 +0100
> Wol <antlists@youngman.org.uk> wrote:
>> On 03/06/2025 02:05, David Niklas wrote:
>>> So I setup the array into read-only mode and started the array with
>>> only two of the drives. Drives 0 and 1. Then I proceeded to try and
>>> start a second pair, drives 2 and 3, so that I could scan them
>>> simultaneously. With the intent of then switching it over to 0 and 2
>>> and 1 and 3, then 0 and 3 and 1 and 2.
>>
>> BACKUP! BACKUP!! BACKUP!!!
> 
> It's when I was trying to make my yearly backup

jesus - that's by far not enough

> When I backup, I erase the previous year

so the first you do is delete the last known good state

> as I don't have enough room otherwise

seriously?

an external 10 TB disk costs around 200 EUR
an external 20 TB disk costs around 400 EUR

with rsnapshot you can make daily, weekly and montly backups
until the doctor comes because anything unchanged are only hard links

> then backup the new year. As a system, it worked up until now.

no, it did not as you found out the first time you needed it

> It assembles fine with all the disks, the problem is the data corruption
> that has occurred across the members

and what makes you think you can fix that manually