no,

ZFS itself is not on top of lvm. only ssd was spitted by lvm for slog(10G) and cache (the rest)

but in any-case the ssd does not help much on glusterfs/ovirt  load it has almost 100% cache misses....:( (terrible performance compare with nfs)

On Thu, Mar 2, 2017 at 1:47 PM, FERNANDO FREDIANI <fernando.frediani@upx.com> wrote:

Am I understanding correctly, but you have Gluster on the top of ZFS which is on the top of LVM ? If so, why the usage of LVM was necessary ? I have ZFS with any need of LVM.

Fernando

On 02/03/2017 06:19, Arman Khalatyan wrote:

Hi,

I use 3 nodes with zfs and glusterfs.

Are there any suggestions to optimize it?

host zfs config 4TB-HDD+250GB-SSD:
[root@clei22 ~]# zpool status
  pool: zclei22
 state: ONLINE
  scan: scrub repaired 0 in 0h0m with 0 errors on Tue Feb 28 14:16:07 2017
config:

    NAME                                    STATE     READ WRITE CKSUM
    zclei22                                 ONLINE       0     0     0
      HGST_HUS724040ALA640_PN2334PBJ4SV6T1  ONLINE       0     0     0
    logs
      lv_slog                               ONLINE       0     0     0
    cache
      lv_cache                              ONLINE       0     0     0

errors: No known data errors

Name:
GluReplica
Volume ID:
ee686dfe-203a-4caa-a691-26353460cc48
Volume Type:
Replicate (Arbiter)
Replica Count:
2 + 1
Number of Bricks:
3
Transport Types:
TCP, RDMA
Maximum no of snapshots:
256
Capacity:
3.51 TiB total, 190.56 GiB used, 3.33 TiB free

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