[ovirt-users] Performance Issue
Tony Brian Albers
tba at kb.dk
Wed Apr 18 12:25:59 UTC 2018
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
> Raid )"
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 at ovirt.org <users-bounces at ovirt.org> *On Behalf Of
> *Thomas Fecke
> *Sent:* Dienstag, 17. April 2018 16:18
> *To:* Roy Golan <rgolan at redhat.com>
> *Cc:* users at 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 at redhat.com>
> *Sent:* Dienstag, 17. April 2018 12:58
> *To:* Thomas Fecke <thomas.fecke at eset.de>
> *Cc:* users at ovirt.org
> *Subject:* Re: [ovirt-users] Performance Issue
>
> On Tue, 17 Apr 2018 at 12:58 Thomas Fecke <thomas.fecke at eset.de
> <mailto:thomas.fecke at 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 at redhat.com <mailto:rgolan at redhat.com>>
> *Sent:* Dienstag, 17. April 2018 11:52
> *To:* Thomas Fecke <thomas.fecke at eset.de <mailto:thomas.fecke at eset.de>>
> *Cc:* users at ovirt.org <mailto:users at ovirt.org>
> *Subject:* Re: [ovirt-users] Performance Issue
>
> On Tue, 17 Apr 2018 at 12:45 Thomas Fecke <thomas.fecke at eset.de
> <mailto:thomas.fecke at 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 at ovirt.org <mailto:users-bounces at ovirt.org>
> <users-bounces at ovirt.org <mailto:users-bounces at ovirt.org>> *On
> Behalf Of *Thomas Fecke
> *Sent:* Dienstag, 17. April 2018 10:58
> *To:* users at ovirt.org <mailto:users at 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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>
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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
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