[ovirt-users] Re: How to make oVirt + GlusterFS bulletproof

A few things to consider, what is your RAID situation per host. If you're using mdadm based soft raid, you need to make sure your drives support power loss data protection. This is mostly only a feature on enterprise drives. Essenstially it ensures the drives reserve enough energy to flush the write cache to disk on power loss. Most modern drives have a non-trivial amount of built in write cache and losing that data on power loss will gladly corrupt files, especially on soft raid setups. If you're using hardware raid, make sure you have disabled drive based write cache, and that you have a battery / capacitor connected for the raid cards cache module. If you're using ZFS, which isn't really supported, you need a good UPS and to have it set up to shut systems down cleanly. ZFS will not take power outages well. Power loss data protection is really important too, but it's not a fixall for ZFS as it also caches writes in systems RAM quite a bit. A dedicated cache device with power loss data protection can help mitigate that, but really the power issues are a more pressing concern in this situation. As far as gluster is concerned, there is not much that can easily corrupt data on power loss. My only thought would be if your switches are not also battery backed, this would be an issue. On 2020-10-08 08:15, Jarosław Prokopowski wrote: > Hi Guys, > > I had a situation 2 times that due to unexpected power outage > something went wrong and VMs on glusterfs where not recoverable. > Gluster heal did not help and I could not start the VMs any more. > Is there a way to make such setup bulletproof? > Does it matter which volume type I choose - raw or qcow2? Or thin > provision versus reallocated? > Any other advise? > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)ovirt.org > Privacy Statement: https://www.ovirt.org/privacy-policy.html > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/MRM6H2YENBP...