On 03/04/2019 02:40, John Stoffel wrote: [...] > I'd probably re-do the RAID using RAID4 (fixed parity disk) since > you're (probably) just doing a bunch of writing of video files, which > are large streaming writes, so you won't pay the penalty of the > Reade/Modify/Write cycle that RAID4/5 has with lots of small files > being writteing. But I'd also be using MD under-neath LVM, with XFS on > top. Something like this: > > 1. partition each disk with a single whole disk partition > 2. mdadm --create /dev/md0 --level=raid4 --raid-devices=8 /dev/sd[a,b,c,e,f,g,k,l]1 > 3. pvcreate /dev/md0 > 4. vgcreate data /dev/md0 > 5. lvcreate -L +12T -n data data > 6. mkfs.xfs /dev/mapper/data-data Why would you explicitly use MD underneath LVM? I have compared the two from a user's level and a best practices perspective. My understanding is that LVM uses MD for its low level operations anyway. What do we gain by using `mdadm --create` instead of using the equivalent LVM commands to set up the RAID array? Andrew _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
