[Users] SLOW I/O performance

[Alex Leonhardt]

I'm still not convinced that that was the actual issue here, but
performance certainly has improved well enough to run and build these VMs.
Could it have something to do of "where" a storage domain runs ?

Alex



On 21 January 2013 14:15, Alex Leonhardt <alex.tuxx at gmail.com> wrote:

> Looks like a version issue - v4 is dead slow, v3 seems to do a "OK" job
> (at the moment) .. is there a way to change the mount options once a
> storage domain has been added to the DC ?
>
> Alex
>
>
>
> On 21 January 2013 12:41, Alex Leonhardt <alex.tuxx at gmail.com> wrote:
>
>>
>> Additionally, I've just seen this on the console ovirt engine web console
>> :
>>
>> Storage domain storage_domain_2 experienced a high latency of
>> 6.76029706001 seconds from host HV2. This may cause performance and
>> functional issues. Please consult your Storage Administrator
>>
>>
>> Alex
>>
>>
>>
>> On 21 January 2013 12:38, Alex Leonhardt <alex.tuxx at gmail.com> wrote:
>>
>>> Hi All,
>>>
>>> This is my current setup:
>>>
>>>
>>> HV1 has :
>>>  storage_domain_1
>>>  is SPM master
>>>
>>> HV2 has :
>>>  storage_domain_2
>>>  is normal (not master)
>>>
>>>
>>> HV1 has storage_domain_1 mounted via 127.0.0.1 (network name, but hosts
>>> entry sends it to loopback)
>>>
>>> HV2 has storage_domain_2 mounted via 127.0.0.1 (network name, but hosts
>>> entry sends it to loopback)
>>>
>>>
>>> All VMs on HV1 have its storage set to storage_domain_1 and all VMs on
>>> HV2 have their storage set to storage_domain_2
>>>
>>>
>>> My problem now is that after I finally created all the disks on HV2 over
>>> a super slow mgmt network (ovirtmgmt), it's a 100 Mbit only, I'm now trying
>>> to kickstart all the VMs I created, however, formatting the disk is taking
>>> for ever ~ 20-30mins for 12 GB, that is roughly how long it took to create
>>> the disks over the 100Mbit link.
>>>
>>> The weirdness really starts with HV2, as all VMs on HV1 with disks on
>>> storage_domain_1 have "good" I/O throughput, all VMs on HV2 are awfully
>>> slow in reading/writing to disk.
>>>
>>> I've tried some network settings to increase throughput, but those didnt
>>> help / had no effect at all.
>>>
>>> Anyone come across this issue ? Is it something to do with the ovirtmgmt
>>> interface only being 100Mbit ?
>>>
>>> Alex
>>>
>>>
>>>
>>>
>>> --
>>>
>>> | RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com|
>>>
>>
>>
>>
>> --
>>
>> | RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com |
>>
>
>
>
> --
>
> | RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com |
>



-- 

| RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com |
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