[ovirt-users] Fwd: Re: Local and Shared storage in same datacenter
maillist at probie.nl
Sun Oct 30 11:14:32 UTC 2016
Op 30-10-2016 om 11:19 schreef Barak Korren:
>> While I understand that this makes having local storage impossible, I
>> believe there is a use case to have local storage in a shared storage
>> Consider the following:
>> I have a few applications that require 1 milli second latency and at most 2
>> milli second.
>> That is not consistenly achievable with shared storage, to that end I added
>> flash storage to a few hypervisors.
>> About 5% of my servers require this and are not that resource hungry to
>> require a dedicated physical server.
>> That same 5% also has no requirement to be migrated if a host fails.
> I mentioned this in another thread already, please look into the VDSM
> scratchpad hook. It will allow you to attach (files on) the local SSDs
> (as disks) to VMs when those VMs start up. It will perfectly meet your
> use case if you only need to keep the data on the SSD while the VM is
The data should not be lost if we power down the VM.
If the data is lost during a host failure we have options to restore the
data, but do not want to do it on a weekly/monthly basis.
The scratchpad is useful for other options we are exploring, thanks!
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