You need a lot faster disks to keep up with all that random I/O.
"Storage IO is average on 75 M/s Read Disk and 25 Write Disk. ( SSD
Ehm, are you running VM's on a DD box? Why on earth would you do that?
/tony
On 2018-04-18 14:09, Thomas Fecke wrote:
Atleast we found the Bottle neck. Our Data Domain is the Problem
IOStat:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0,00 615,67 78,00 962,33 2125,33 37065,33
75,34 5,68 5,42 1,10 5,77 0,96 99,40
avg-cpu: %user %nice %system %iowait %steal %idle
0,00 0,00 1,44 22,63 0,00 75,93
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0,67 655,33 92,00 1033,67 2446,67 38390,67
72,56 5,66 5,06 1,83 5,35 0,88 99,50
Any Idea why we got so much write Requests? Its getting up to 2000.
I guess the IO is from our Windows VM´s
*From:*users-bounces@ovirt.org <users-bounces(a)ovirt.org> *On Behalf Of
*Thomas Fecke
*Sent:* Dienstag, 17. April 2018 16:18
*To:* Roy Golan <rgolan(a)redhat.com>
*Cc:* users(a)ovirt.org
*Subject:* Re: [ovirt-users] Performance Issue
Guest: Win 10 and 2016
Disk: VirtISCSI – Thin provision
Domain: Single Data Domain – NFS 4
*From:*Roy Golan <rgolan(a)redhat.com>
*Sent:* Dienstag, 17. April 2018 12:58
*To:* Thomas Fecke <thomas.fecke(a)eset.de>
*Cc:* users(a)ovirt.org
*Subject:* Re: [ovirt-users] Performance Issue
On Tue, 17 Apr 2018 at 12:58 Thomas Fecke <thomas.fecke(a)eset.de
<mailto:thomas.fecke@eset.de>> wrote:
Hey Thank you,
If been monitoring vor about an Hour now. The Templates VM´s are
really slow – copy a new Template is slow. Non Template VM´s are fast
Storage IO is average on 75 M/s Read Disk and 25 Write Disk. ( SSD
Raid )
Network is on 500 Mbits/s internal ( 10 Gbit Stroage connection )
And about 25Mbit/s external ( 400.000 k Internet )
I realy cant find that bottle neck
what type is the disks, the domain, how many domains ?
*From:*Roy Golan <rgolan(a)redhat.com <mailto:rgolan@redhat.com>>
*Sent:* Dienstag, 17. April 2018 11:52
*To:* Thomas Fecke <thomas.fecke(a)eset.de <mailto:thomas.fecke@eset.de>>
*Cc:* users(a)ovirt.org <mailto:users@ovirt.org>
*Subject:* Re: [ovirt-users] Performance Issue
On Tue, 17 Apr 2018 at 12:45 Thomas Fecke <thomas.fecke(a)eset.de
<mailto:thomas.fecke@eset.de>> wrote:
Okay,
it seems to be that the Storage IO is the Problem – every Write
and Read Process takes a lot of time
Sometimes the copy Job stops with 0/Byte and the traffic goes up
and down like a mountain.
But the Storage Read and Write M/s looking fine… I don’t get it
Any toughts?
Keep monitoring you storage backend interface and see what's going
on there if you don't see anything special on the host. It could be
the network that leads to slow IO as well, who knows.
If the initial VM creation is taking long you might want to create a
pool from your template with Pre-Started VMs, and that would at
least save you from the wait when you actually need the VM.
*From:* users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>
<users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>> *On
Behalf Of *Thomas Fecke
*Sent:* Dienstag, 17. April 2018 10:58
*To:* users(a)ovirt.org <mailto:users@ovirt.org>
*Subject:* [ovirt-users] Performance Issue
Hey Guys,
We Deploy a lot of Templates. We got our Training Environment
build in Ovirt.
Our Problem – when we Deploy the Same Template. The VM´s getting
slower every Time we deply a new VM from that Template.
And I really don’t know why. RAM locking good – CPU and Network
looking good.
But it take about 15 Minute to create a new Template based VM –
normaly it takes about 30 Seconds.
I checked nload and the Interface traffic – but its not really high.
Can someone explain why its getting so slow and how to troubleshoot?
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Tony Albers
Systems administrator, IT-development
Royal Danish Library, Victor Albecks Vej 1, 8000 Aarhus C, Denmark.
Tel: +45 2566 2383 / +45 8946 2316