[Gluster-users] Gluster performance on the small files

[Michaël Couren]

> 
> 268435456 bytes (268 MB) copied, 57.3145 s, 4.7 MB/s
> 

Hi, I did the same test on various replicated volumes we have
on 3 KVM virtual machines.

* Gluster 3.6.0 Bricks on same disk as the system (ext4+lvm) : 1.0 MB/S, (1,6 MB/s for the sytem disk)
* Gluster 3.6.2 Bricks on same disk as the system (xfs) : 2,4 MB/S, (2.4 MB/s for the sytem disk)
* Gluster 3.6.2 Bricks on separate SAN LUNs (xfs): 14 MB/S (22MB/s for the system disk)

Remark : same test on various machines without GLuster :
* 5 VMs, writing through VirtIO driver on SAN LUNs : 37 MB/s, 57 MB/s, 49MB/S, 55MB/S, 56MB/S
* 3 baremetal servers (RAID 5 on SAS disks) : 105 MB/s, 128 MB/s, 100MB/s
* 1 baremetal server (SSD drive) : 141 MB/s
* my personnal ubuntu recent laptop (XFS) : 16MB/S on SSD drive ; 1.6 MB/S on encrypted /home  :( 

Conclusions : a 40% decrease is observed in some cases, not all.
Global performances are mainly those of the machines homing glusterfs
(VMs on SAN perf are 50% those of baremetal local disk)
-- 
Cordialement / Best regards, Michaël Couren,
ABES, Montpellier, France.