I have UrBackup server for internet backups only.
It has 70 clients.
The problem is very high iowait 25-65%. Write speed around 8-15 Mb/sec!!! Because of this, backups do not have time to be created.
Time of mounts btrfs 5 minutes!
Even If I stop urbackup service iowait still 25-30%. And linear write speed still around 8-15Mb/sec.
I read that when btrfs has a large number of snapshots, the file system starts to slow down a lot. But it is snapshots that are used to create backups.
I have about 80 snapshots for each client, i.e. more than 1000 snapshots in total.
I tried everything I could, but I couldn’t find a solution. Please help!
Someone had a similar problem. And how did you solve it. I will be happy to any suggestions.
Backups creates everyday. For each client:
Minimal number of incremental file backups: 40 max 100
Minimal number of incremental image backups: 20 max 40
The size - 25Tb.
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vgurbackup-lvurbackup1 25T 20T 5.5T 78% /media/BACKUP/urbackup