Re: [Users] Virtual Disk creation - really slow (config issue?) e.g 20GB disk created in 23 mins - NFS server/Gigabit switch - can anyone suggest why speed is so slow ? (at this rate it would take 1hr 40 mins to create a 100GB disk...)
Thank you Gary.
After re-mounting the NFS share with async it dramatically increased the
speed !
I can now create a 10GB virtual disk in 2 mins (rather than 10 mins)
Is using the async option more likely to cause data corruption though ?
Many thanks
Regards
On 22 March 2012 21:54, Gary Scarborough <virtuallymad(a)gmail.com> wrote:
On Thu, Mar 22, 2012 at 12:59 PM, Morgan Cox <morgancoxuk(a)gmail.com>wrote:
> Hi.
>
> After my many issues with spice I have finally sorted them out.
>
> Now I am having an issue with the speed of virtual disk creation - when I
> go to create a virtual disk it takes a long time (far to long to be usable)
>
> My setup is as following
>
> 3 servers:-
>
> 1 Frontend (ovirt engine) - Fedora 16 - external + local IP
> (91.215.xxx.xx + 10.0.0.10)
> 1 Ovirt node (using the node .iso) - external + local IP (ovirtmgmt
> (eth0) - 91.215.xxx.xxx and LAN (eth1) - 10.0.0.101)
> 1 NFS storage - external + local IP - I attached the storage using the
> Local IP (10.0.0.190)
>
> All servers are connected via a Gigabit switch (so speed should be better)
>
> I can scp between servers far faster - I'm almost sure its due to the
> node ovirtmgmt address being an external (internet ip) and not LAN ip. -
> therefore the traffic is not just going over the gigabit switch but via the
> core router in the DC...
>
> Can anyone suggest how I can 'debug' where the slowness is coming from
>
> On my NFS server I have it setup like (in /etc/exports)
>
> /storage1 *(rw,sync,no_subtree_check)
>
> I had previous tried setting up the node on a LAN IP previously and it
> caused spice to not work - as the node had no internet access / DNS - I
> also tried making the frontend server a gateway (and using - iptables -t
> nat -A POSTROUTING -j MASQUERADE ) - this also cause spice to not work (as
> it always tried to connect to the 10.0.0.x address from my desktop - and
> fail..)
>
> Any hints/help will be welcomed
>
> Cheers
>
>
>
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>
You could try async instead of sync. You could also try thin provisioning.
--
Gary Scarborough
IST Lab Manager
Rochester Institute of Technology
Rochester NY
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