[GLLUG] Replacement disk in RAID

[Peter Grant]

I'd say not to replace A yet, but expect to soon. The theory I've heard
(and like, based on one experience) is that having disks of different ages
(even different manufacturers) tends to increase the likelihood of failures
at different times.

For HDD/SSD, if this is as bulk storage, is speed a particular concern? HDD
still gives best value for space if you're more interested in space than
speed.

On Sun, 30 Apr 2023 at 08:07, Dr. Axel Stammler via GLLUG <
gllug at mailman.lug.org.uk> wrote:

> Good morning,
>
> one of four hds in my LVM2 raid has stopped reacting to SMART commands or
> anything else. The 16 TB raid system contains four 8 TB hds in a RAID 1 set
> of two RAID 4 pairs:
>
> RAID 1 ┌ RAID 4 ┌ A
>         │        └ B ← needs to be replaced
>         │ RAID 4 ┌ C
>         └        └ D
>
> So I need to replace hard disk B, buy a new disk and integrate it.
>
> Should I replace disk A, too, as it is of the same age? If not, should the
> replacement B be larger so that in the future I can grow the array? Should
> I get an HDD or an SSD?
>
> Any tips on the choice of hard disk (size, parameters, maker) as well as
> on the procedure would be much appreciated.
>
> Axel
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