[Users] SLOW I/O performance

[Alex Leonhardt]

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 |
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