On May 10, 2007, at 01:36, Matthew Hannigan wrote:
> On Thu, May 10, 2007 at 01:27:35AM -0500, Ryan Schmidt wrote:
>>
>> My understanding of SANs is that they are seen by the OS the same way
>> that a local hard disk is seen,
>
> true but ...
>
>> and also that it is perfectly safe
>> for multiple machines to attempt to read from and write to files on
>> the SAN concurrently, because the SAN will manage these requests in a
>> way that prevents problems.
>
> This doesn't apply. SANs are shared but tyipcally not the
> individual disks
> /volumes from a SAN box. Clusters do that, but still not
> simultaneously.
I should further clarify that my understanding of SANs is limited to
Apple's documentation of their Xsan product, which I believe is a
cluster filesystem, so apparently I don't know know where a SAN stops
and a cluster filesystem begins. So wherever I have said "SAN" in
previous postings, please substitute "SAN with cluster filesystem" or
"Apple Xsan."
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Received on Thu May 10 09:13:45 2007