Re: Setup Recommendation on UEFI/GRUB/RAID1/LVM

[Wols Lists <antlists@youngman.org.uk>]

On 16/04/20 02:50, David C. Rankin wrote:
> On 04/14/2020 09:20 AM, Wols Lists wrote:
>> That's true, but is it worth it? RAM is cheap, max out your motherboard,
>> and try and avoid falling into swap at all. I have one swap partition
>> per disk, but simply set them up as equal priority so the kernel does
>> its own raid-0 stripe across them. Yes a disk failure would kill any
>> apps swapped on to that disk, but my system rarely swaps...
> 
> That's a neat approach, I do it just the opposite and care RAID1 partitions
> for swap (though I rarely swap as well). I've never had an issue restarting
> after a failure (or me doing something dumb like hitting the wrong button on
> the UPS)
> 
> So that I'm understanding, you simply create a swap partition on each disk not
> part of an array, swapon both and let the kernel decide?
> 
Don't forget the mount option "pri=1" ... the following is the relevant
lines from my fstab ...

# /dev/sda2             none            swap            sw,pri=1        0 0
UUID=184b6322-eb42-405e-b958-e55014ce3691       none    swap    sw,pri=1
       0 0
# /dev/sdb2             none            swap            sw,pri=1        0 0
UUID=48913c8d-e4c4-482d-9733-e44be3889f07       none    swap    sw,pri=1
       0 0
# /dev/sdc2             none            swap            sw,pri=1        0 0

If you don't use the priority option, each partition is allocated a
different priority and it fills them up one after the other (raid
linear). Make them all equal priority, and it'll stripe them.

Cheers,
Wol