Re: Amazon High I/O instances

On Wed, Aug 22, 2012 at 4:12 PM, Alan Hodgson <ahodgson@simkin.ca> wrote:
> On Wednesday, August 22, 2012 04:10:01 PM Andrew Hannon wrote:
>> Just looking into High IO instances for a DB deployment. In order to get
>> past 1TB, we are looking at RAID-0. I have heard
>> (http://hackerne.ws/item?id=4266119) there might be a problem if TRIM isn't
>> supported. Does anyone know if it is and has anyone used RAID-0 on these
>> instances? (Linux of course…)
>
> Just use LVM striping. If it turns out to be an issue; that seems to be mostly
> conjecture.
>
> I note that the SSDs are only instance storage. The data will be gone when the
> instance goes away. I have used instance storage in replicated setups but it
> always feels rather fragile unless your data really is transient or you can
> maintain 2 replicas.
>
> Their other new service, provisioned IOPS for EBS, might be more useful for a
> persistent database. Although not nearly SSD speeds, of course.

Yeah -- I should have mentioned that: you absolutely must run hs/sr or
some other strategy that maintains your data.  I guess you might as
well turn off fsync, right?

merlin