On Wed, Mar 24, 2021 at 11:26 PM Chris Murphy <li...@colorremedies.com> wrote:
> On Wed, Mar 24, 2021 at 3:47 PM Richard Shaw <hobbes1...@gmail.com> wrote: > > > > I've been running MythTV for about 10 years now and I've finally > outgrown my media storage, currently a single 4TB disk drive. I have > purchased 3 additional drives of the same model and plan to put them into a > BTRFS RAID1 array. > > > > Setting nodatacow on the media directories is a no-brainer, but what > other optimizations can I do? > > nodatacow means nodatasum and no compression. If the file becomes > corrupt, it can't be detected or corrected. > Ok, so that may be a problem. I'm not worried about compression since it's all MPEG2/H264 files anyway but the nodatasum would defeat the purpose... > > Due to all the firmware bugs, I tend to mix make/model drives rather > than get the same ones that are all going to have the same bug at the > time time if something goes wrong like a power fail or crash right > after going a bunch of writes. Whereas separate bugs, btrfs can always > do fix ups from the good drive whenever the bad one misbehaves. > So how long do you wait until you consider the drive "good"? :) I'm not in a hurry so I could setup two of the drives in a RAID1 mirror and copy my media over and just let it run for a while before I add disks 3 & 4. > If they've proven their reliability in case of crash or power fail, as > in start doing a big file(s) copy, and yank power on all the drives at > once: Reboot. Reattach the drives. Remount. Any errors? Does it > mount? If you can do this 10x without errors, it might be OK. > Regardless of which computer it is in the house, critical stuff is backed up on a BackupPC server and the super critical stuff also backed up on multiple cloud services (Google Drive, SpiderOak, Dropbox, etc), although it has been a while since I burned a disc and put it in the fire safe :) I would hate to lose all the media but it wouldn't be the end of the world for me so I think 10x is good enough :) Still, I'd probably opt to set a udev rule for all the drives and > disable the write cache. It isn't worth the trouble. > I know you mentioned this on another thread but google is failing me as to how to do it. Do you have a useful link? Thanks, Richard
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