On Tue, Jul 03, 2018 at 04:26:37AM +0000, Paul Jones wrote:
> I don't have any experience with this, but since it's the internet let me
> tell you how I'd do it anyway 😝
That's the spirit :)
> raid5
> dm-crypt
> lvm (using thin provisioning + cache)
> btrfs
>
> The cache mode on lvm requires you to set up all your volumes first, then
> add caching to those volumes last. If you need to modify the volume then
> you have to remove the cache, make your changes, then re-add the cache. It
> sounds like a pain, but having the cache separate from the data is quite
> handy.
I'm ok enough with that.
> Given you are running a backup server I don't think the cache would
> really do much unless you enable writeback mode. If you can split up your
> filesystem a bit to the point that btrfs check doesn't OOM that will
> seriously help performance as well. Rsync might be feasible again.
I'm a bit warry of write caching with the issues I've had. I may do
write-through, but not writeback :)
But caching helps indeed for my older filesystems that are still backed up
via rsync because the source fs is ext4 and not btrfs.
Thanks for the suggestions
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
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