Many thanks Gary
On 25 March 2012 02:25, Gary Scarborough <virtually...@gmail.com> wrote: > It can. I have seldom had need to worry about it. Most data centers have > battery backups to keep power outages from crashing systems. I am also not > sure if its any more or less of a risk than iscsi, except you may not be > able to tell right away. async works by basically lying to the client > about the read/write. Keep in mind that the read/write may be into a > virtual machine in this case. Even if all packets are accounted for, not > completing the full stream of writing could lead to a corrupt VM filesystem > anyway. In my mind, its worth the risk for the speed. This is also why we > do backups. > > > > On Fri, Mar 23, 2012 at 7:48 AM, Morgan Cox <morganco...@gmail.com> wrote: > >> 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 <virtually...@gmail.com> wrote: >> >>> >>> >>> On Thu, Mar 22, 2012 at 12:59 PM, Morgan Cox <morganco...@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 >>>> >>>> >>>> >>>> _______________________________________________ >>>> Users mailing list >>>> Users@ovirt.org >>>> http://lists.ovirt.org/mailman/listinfo/users >>>> >>>> >>> You could try async instead of sync. You could also try thin >>> provisioning. >>> >>> -- >>> Gary Scarborough >>> IST Lab Manager >>> Rochester Institute of Technology >>> Rochester NY >>> >> >> > > > -- > Gary Scarborough > IST Lab Manager > Rochester Institute of Technology > Rochester NY >
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