11:23 p.m.
Hello,
I'm running oVirt with several data centers, some with NFS storage and
some with local storage.
I had problems in the past with a large pool and local storage. The
problem was nodectl showed the pool being too full (I think >80%), but
it was only the images that made the pool "full" -- and this storage was
carefully setup such that there was no chance it would actually fill.
The LVs for oVirt itself were all under 20%, yet nodectl still reported
the pool was too full.
My solution so far has been to use our RAID card tools, so that sda is
the oVirt node install, and sdb is for images. There are probably other
good reasons for me to handle it this way, for example being able to use
different RAID levels, but I'm hoping someone can confirm my
partitioning below doesn't have some risk I'm now yet aware of.
I setup a new volume group for images, as below:
[root@node4-g8-h4 multipath]# pvs
PV VG Fmt Attr PSize
PFree
/dev/mapper/3600508b1001c7e172160824d7b204c3b2 onn_node4-g8-h4 lvm2
a-- <119.00g <22.85g
/dev/sdb1 data lvm2 a--
1.13t <361.30g
[root@node4-g8-h4 multipath]# vgs
VG #PV #LV #SN Attr VSize VFree
data 1 1 0 wz--n- 1.13t <361.30g
onn_node4-g8-h4 1 13 0 wz--n- <119.00g <22.85g
[root@node4-g8-h4 multipath]# lvs
LV VG Attr LSize
Pool Origin Data% Meta% Move Log Cpy%Sync
Convert
images_main data -wi-ao---- 800.00g
home onn_node4-g8-h4 Vwi-aotz--
1.00g pool00 4.79
ovirt-node-ng-4.2.5.1-0.20180816.0 onn_node4-g8-h4 Vwi---tz-k
64.10g pool00 root
ovirt-node-ng-4.2.5.1-0.20180816.0+1 onn_node4-g8-h4 Vwi---tz--
64.10g pool00 ovirt-node-ng-4.2.5.1-0.20180816.0
ovirt-node-ng-4.2.6-0.20180903.0 onn_node4-g8-h4 Vri---tz-k
64.10g pool00
ovirt-node-ng-4.2.6-0.20180903.0+1 onn_node4-g8-h4 Vwi-aotz--
64.10g pool00 ovirt-node-ng-4.2.6-0.20180903.0 4.83
pool00 onn_node4-g8-h4 twi-aotz--
91.10g 8.94 0.49
root onn_node4-g8-h4 Vwi---tz--
64.10g pool00
swap onn_node4-g8-h4 -wi-ao---- 4.00g
tmp onn_node4-g8-h4 Vwi-aotz--
1.00g pool00 4.87
var onn_node4-g8-h4 Vwi-aotz--
15.00g pool00 3.31
var_crash onn_node4-g8-h4 Vwi-aotz--
10.00g pool00 2.86
var_log onn_node4-g8-h4 Vwi-aotz--
8.00g pool00 3.57
var_log_audit onn_node4-g8-h4 Vwi-aotz--
2.00g pool00 4.89
The images_main is setup as "Block device for filesystems" with ext4. Is
there any reason I should consider pool for thinly provisioned volumes?
I don't need to over-allocate storage and it seems to me like a fixed
partition is ideal. Please confirm or let me know if there's anything
else I should consider.
Thanks
Matt