5:14 a.m.
Hi Guys or Girls,
I have a problem in a productive system. We use three Servers which have
a Raid 5 with four Harddrives SATA 8 TB 7200 rpms. The Systems are
interconnected for Glusterfs with 1 GB/s.
The Network Load between all three servers are between 5 and 8 % of the
network. The Glusterfs has a separate VLAN which complete isolated from
other networks.
Find attached a small drawing.
On that server we rum as HA and there are 8 VMs installed. Most of the
VMs working well but if there is high load on the system some of the VM
can't write the Data in a "good" speed on the disks. The Glusterfs is
configured as Replica on the Raid5 disk which is as Jbob in Glusterfs
defined.
If i take a look on the iostats i can see that the Harddisk have round
50 open connections some of the glusterfs and a lot of the vms. In side
the VMs i can see long iowaiting times from 300 up to 600 ms. With is on
case of a Posgresql database very long.
Should we configure the Raid5 controller out that the controller only
should 4 disks with 8 TB and Glusterfs should connect directly to the
/dev/sd[b-e]?
What do you think? Will SSD HDD will help on performance but the same
config with Raid5 and Jbod could be the bigger problem.
Thanks
Marcel
8:59 p.m.
If you need high performance you should consider:- upgrading to RAID10- Move to SAS
Spinning disks or to SSDs/NVMEs- or a combination of those (NVMEs for LVM cache + SAS
disks in RAID10)
Best Regards,Strahil Nikolov
On Sun, Feb 28, 2021 at 15:17, Marcel d'Heureuse<marcel(a)deheureu.se> wrote:
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{border:0px;}#yiv4732623807 Hi Guys or Girls,
I have a problem in a productive system. We use three Servers which have a Raid 5 with
four Harddrives SATA 8 TB 7200 rpms. The Systems are interconnected for Glusterfs with 1
GB/s. The Network Load between all three servers are between 5 and 8 % of the network. The
Glusterfs has a separate VLAN which complete isolated from other networks.
Find attached a small drawing.
On that server we rum as HA and there are 8 VMs installed. Most of the VMs working well
but if there is high load on the system some of the VM can't write the Data in a
"good" speed on the disks. The Glusterfs is configured as Replica on the Raid5
disk which is as Jbob in Glusterfs defined.
If i take a look on the iostats i can see that the Harddisk have round 50 open connections
some of the glusterfs and a lot of the vms. In side the VMs i can see long iowaiting
times from 300 up to 600 ms. With is on case of a Posgresql database very long.
Should we configure the Raid5 controller out that the controller only should 4 disks with
8 TB and Glusterfs should connect directly to the /dev/sd[b-e]?
What do you think? Will SSD HDD will help on performance but the same config with Raid5
and Jbod could be the bigger problem.
ThanksMarcel
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Marcel d'Heureuse -
Strahil Nikolov