2:09 a.m.
I did this in the past and didn’t have any trouble with gluster/ZFS, but 4.2.x probably
does more validation.
I recommend these settings on your zfs volumes, I set mine at the root(v0 here) and let
them inherit:
required:
v0 xattr sa local
v0 acltype posixacl local
optional but I recommend them:
v0 relatime on local
v0 compression lz4 local
For gluster, I think it checks that it’s been “optimized for virt storage”. Either apply
the virt group or set the options you’ll find in /var/lib/glusterd/groups/virt.
Note that I don’t recommend the default settings for cluster.shd-max-threads &
cluster.shd-wait-qlength. They can swamp your machines during heals unless you have a lot
of cores and ram. You get a slightly faster heal, but often have VMs pausing for storage
or other odd ball storage related errors. I prefer max-threads = 1 or maybe 2, and
wait-qlength=1024 or 2048. These are per volume, so they hit harder than you think they
will if you have a lot of volumes running.
Also make sure the gluster volumes themselves got set to 36.36 for owner.group, doesn’t
matter for the bricks. Can do it with volume settings or mount the volume and set it
manually.
Hope it helps!
-Darrell
On Nov 15, 2018, at 6:28 AM, Thomas Simmons <twsnnva(a)gmail.com>
wrote:
Hello All,
I recently took a new job in a RedHat shop and I'd like to move all of my homelab
systems to RedHat upstream products to better align with what I manage at work. I had a
"custom" (aka - hacked together) 3-node Hyperconverged XenServer cluster and
would like to get this moved over to Ovirt (I'm currently testing with 4.2.7).
Unfortunately, my storage is limited to software RAID with a 128GB SSD for cache. If at
all possible, I would prefer to use ZFS (RAIDZ+ZIL+L2ARC) instead of MD RAID + lvmcache,
however I'm not able to get this working and I'm not sure why. My ZFS and Gluster
configuration is working - at least where I can manually mount all of my gluster volumes
from all of my nodes, however, hosted-engine --deploy fails. I understand this isn't
an out of the box configuration for Ovirt, however I see no reason why this shouldn't
work. I would think this would be no different than using any other Gluster volume for the
engine datastore, Am I missing something that would prevent this from working?
[ INFO ] TASK [Add glusterfs storage domain]
[ ERROR ] Error: Fault reason is "Operation Failed". Fault detail is
"[Storage Domain target is unsupported]". HTTP response code is 400.
[ ERROR ] fatal: [localhost]: FAILED! => {"changed": false,
"deprecations": [{"msg": "The 'ovirt_storage_domains'
module is being renamed 'ovirt_storage_domain'", "version": 2.8}],
"msg": "Fault reason is \"Operation Failed\". Fault detail is
\"[Storage Domain target is unsupported]\". HTTP response code is 400."}
Even though it fails, it appears to have mounted and written __DIRECT_IO_TEST__ to my
Gluster volume:
[root@vmh1 ~]# mount -t glusterfs localhost:/engine /mnt/engine/
[root@vmh1 ~]# ls /mnt/engine/
__DIRECT_IO_TEST__
If I cancel and try to run the deploy again, I get a different failure:
[ ERROR ] Error: Fault reason is "Operation Failed". Fault detail is
"[Error creating a storage domain]". HTTP response code is 400.
[ ERROR ] fatal: [localhost]: FAILED! => {"changed": false,
"deprecations": [{"msg": "The 'ovirt_storage_domains'
module is being renamed 'ovirt_storage_domain'", "version": 2.8}],
"msg": "Fault reason is \"Operation Failed\". Fault detail is
\"[Error creating a storage domain]\". HTTP response code is 400."}
Gluster seems ok...
[root@vmh1 /]# gluster volume info engine
Volume Name: engine
Type: Replicate
Volume ID: 2e34f8f5-0129-4ba5-983f-1eb5178deadc
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 3 = 3
Transport-type: tcp
Bricks:
Brick1: vmh1-ib:/zpool1/engine
Brick2: vmh2-ib:/zpool1/engine
Brick3: vmh3-ib:/zpool1/engine
Options Reconfigured:
transport.address-family: inet
nfs.disable: on
performance.client-io-threads: off
ZFS looks good too...
[root@vmh1 ~]# ansible ovirthosts -m shell -a 'zpool status' -b
vmh1 | CHANGED | rc=0 >>
pool: zpool1
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
zpool1 ONLINE 0 0 0
sdc ONLINE 0 0 0
sdd ONLINE 0 0 0
sde ONLINE 0 0 0
logs
sdb2 ONLINE 0 0 0
cache
sdb1 ONLINE 0 0 0
errors: No known data errors
vmh3 | CHANGED | rc=0 >>
pool: zpool1
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
zpool1 ONLINE 0 0 0
sdc ONLINE 0 0 0
sdd ONLINE 0 0 0
sde ONLINE 0 0 0
logs
sdb2 ONLINE 0 0 0
cache
sdb1 ONLINE 0 0 0
errors: No known data errors
vmh2 | CHANGED | rc=0 >>
pool: zpool1
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
zpool1 ONLINE 0 0 0
sdc ONLINE 0 0 0
sdd ONLINE 0 0 0
sde ONLINE 0 0 0
logs
sdb2 ONLINE 0 0 0
cache
sdb1 ONLINE 0 0 0
errors: No known data errors
Permissions seem ok
[root@vmh1 ~]# ansible ovirthosts -m shell -a 'ls -n /zpool1' -b
vmh3 | CHANGED | rc=0 >>
total 2
drwxr-xr-x. 3 36 36 3 Nov 15 04:56 data
drwxr-xr-x. 3 36 36 4 Nov 15 06:31 engine
drwxr-xr-x. 3 36 36 3 Nov 15 04:56 iso
vmh1 | CHANGED | rc=0 >>
total 2
drwxr-xr-x. 3 36 36 3 Nov 15 04:56 data
drwxr-xr-x. 3 36 36 4 Nov 15 06:31 engine
drwxr-xr-x. 3 36 36 3 Nov 15 04:56 iso
vmh2 | CHANGED | rc=0 >>
total 2
drwxr-xr-x. 3 36 36 3 Nov 15 04:56 data
drwxr-xr-x. 3 36 36 4 Nov 15 06:31 engine
drwxr-xr-x. 3 36 36 3 Nov 15 04:56 iso
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