MDB for backup

robyt

Hi, in the NFS configuration i see:

Store backup as multiple data blocks instead of a whole VHD file. (creates 500-1000 files per backed up TB but allows faster merge)

but in the info popup i see:

Your remote must be able to handle parallel access (up to 16 write processes per backup) and the number of files (500 files per GB of backed up data)

It's a little different
in my test the real number is near the 500/gb, not 1000/tb.. is correct ?

olivierlambert

Indeed, the "data blocks" are splitting a VHD to many 2MiB files. If it's enabled, it means that for a 10GiB VHD on XCP-ng (in terms of used blocks), it will create 5120 files of 2MiB.

So yes, it's 500 per GiB, not per TiB. We'll fix the sentence. Pinging @florent

florent

@robyt nice catch

We use compression when selecting block based backup (by default brotli), that brings a 20-50% storage reduction depending on the data
PR is here https://github.com/vatesfr/xen-orchestra/pull/6865 and will be merged before may release

fbeauchamp opened this pull request in vatesfr/xen-orchestra

MDB for backup

closed fix(xo-web): VHD directory tooltip #6865