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<quote who="Graeme Fowler">
> On Wed 22 Jun 2005 08:36:37 BST , Gavin Henry
> <ghenry@xxxxxxxxxxxxxxxxxx> wrote:
>> What do people recommend for shared storage for the realservers and
>> directors?
>
> Why would you want shared storage for the directors? [this isn't a
> "what a dumb idea" question, I just don't understand why you'd need
> it...]
Sorry, this was a mistake. I missread the docs ;-)
>
> If you were to link the directors together in some way, assuming that
> you run them in a MASTER/BACKUP system, having something gluing the two
> together would (in my mind) quite effectively negate the redundancy
> capability and turn the two of them into a SPOF. Unless I misunderstand
> you :)
>
>> Someone recommended drbd for the directors, but what about the real
>> servers?
It was drbd for the realservers, oops.
>>
>> NAS/SAN?
>>
>> The configuration we are planning to implement is a dual director setup
>> with 3 realservers for apache.
>
> Assuming this is Apache on Linux (or other UNIX) then cost is your
> biggest hurdle, followed by performance. For a toe-in-the-water test,
> use vmstat or sar on a current server and collect a few days' data
> regarding disk IO. You can then work out how many concurrent read/write
> ops you utilise, and work out the relevant peaks & averages - but note
> that compared to disks in servers it would differ slightly for NAS or
> SAN operations due to the way they're built. It would give you an idea,
> at least.
>
> Then you can look at what's on the market.
>
> Probably the most mature shared storage platform for Linux would be a
> NAS doing NFS; the most experience I have of this is a Network
> Appliance filer but they aren't cheap.
>
> I've no experience of NAS usage under Linux, so can't comment on that
> directly.
>
> Perhaps you could use a shared DAS instead, like the HP storage arrays?
Thanks for the advice.
>
> HTH
>
> Graeme
>
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