Re: [Gluster-devel] Hello... stripping and fault tolerant systems...

[Anand Avati]

> > AFR ( STRIPE (server1, server2), server3)
>> >
>> > Let afr serve over the stripe for high performance by default, and
>> server3
>> > be a backup. This works well for read-heavy workloads.
>>
>> How will afr over stripe help for read-heavy work loads?
>>
> Kris, this is because, you can say 'read-subvolume' as stripe volume,
> through which you can read faster (because read calls can be sent parallally
> to two nodes, and hence faster).
>
>
>>
>> I suggested stripe over afrs keeping in mind AFR's currently bad selfheal
>> logic
>> for big files. Selfheal will be very optimal in stripe over afrs.
>>
> For the very reason AFR over STRIPE makes sense. because in this case, afr
> doesn't see any files with holes, where as in stripe over afr, you see files
> with holes below afr.
>

Also because, unstriped copy of a file is safer as a backup (though slower,
which can be worked around for read-heavy ops) than copied striped chunks.

avati