could it be that when start out with an #dmraid with 4 equal drives in #RAID 5 and then add 4 more similar drives at the same time) later that it'll basically RAID0 each of the drives in the RAID5?

(I didn't tell it anything other than lvextend -l 100%FREE, I think. It has been a while. Just wondered why the total capacity is missing two instead of one drive...)

Guess it's time to learn how to tell which topology #LVM choose internally from the lvs/pvs/vgs/... tools output.

#Linux

Oh, this combination of parameters and features causes lvcreate to incorrectly calculate the extents it needs and the command fails. (Needed to calculate them manually to fully use the drives. Probably could just have yolo-ed it with 89%FREE instead or something)

lvcreate --type raid6 --size 100%FREE --config allocation/raid_stripe_all_devices=1 --name raid6Data --raidintegrity y --raidintegritymode journal --raidintegrityblocksize 512 --autobackup y lvm_vg_<<UUID>>

#LVM #Linux #dmraid

@lamp using a #RAID without #dmraid only works well with things like #RAID1 on a boot partition since that's the only way to keeo it sync and be bootable...

I usually choose to make lvm partitions to do dmraid and also choose to keep at least 25% vacant for #WearLeveling and #GarbageCollection as well as #TRIM to work, and round it down so I can mix & match drives

But then again going #ZFS is the smarter route...

@lcruggeri @DosFox consider doing #dmraid?

Or if you're concerned bout writes killing the cheap us flashdrives: #rsync'ing stuff...

Solución “dmraid: Module dm-raid45 does not exist”

https://www.ochobitshacenunbyte.com/2019/02/13/solucion-dmraid-module-dm-raid45-does-not-exist/

#dmraid #dm-raid45 #LMDE #LinuxMint