Am Di., 14. Jan. 2020 um 10:38 Uhr schrieb vlad f halilov <vfh@xxxxxxxxx>:
Hi there. I'm trying to deploy replicated 2+1 cluster with gluster 5.5.1
(debian 10) as vm image storage for libvirt, but have an issue with
healing disconnected node. Example:
...
4) After node5 has reconnected, healing procedure has begun, but looks
that about to entire file have transferred from synced node to unsynced,
instead just changed blocks. (ifconfig on node5 showed ' RX
packets 269790 bytes 5293724127 (4.9 GiB)) - so little less than 5Gb
file' I tried 'difff' mode (gluster volume set vmpool
cluster.data-self-heal-algorithm diff) but with no effect. Any idea,
whats wrong?
Actually i think diff should be working the way you expect it to, but diff is very cpu-intensive as it needs to calculate and check checksums.
I would advise you to look at the example configuration for volumes with vm-disks, it should be "/var/lib/glusterd/groups/virt". The main thing is sharding is activated ("split big files internally in many small ones") and set heal-algorithm to full.
This way heal is very fast, as it only resyncs the changed shards without the need of checksums. I use it the same way on multiple hosts, each with about 20-30 vms.
And Check the value of "features.shard-block-size", don't know what the default is atm - i use 64MB and it works quite well.
Regards.
Mika
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