[Dovecot] Howto add another disk storage

Stan Hoeppner stan at hardwarefreak.com
Sat Jul 7 09:37:31 EEST 2012

On 7/6/2012 2:16 AM, Wojciech Puchar wrote:
>> You wouldn't partition the large LUN.  You'd simply directly format it
>> with XFS.  Laying a partition table on it would introduce the real
> Fine. i understand that. What i am suggesting is not making large LUNs.
> you get the best performance with directly attaching disks to your machine.

That's simply not true.  99% of block latency is rotational.  iSCSI
packet latency is an order of magnitude less than rotational latency,
and fiber channel packet latency is a couple orders of magnitude lower
still, even with a couple switches between the server and storage array.

Thus it doesn't matter how you attach your mechanical disks to a server,
as the latency is in the drives, not the data path.


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