chaining JBOD chassic to server ... why am I scared ? (ZFS)

[Rich]

*waves with his 360 disks attached to single head node*

c.f. http://www.senecadata.com/products/vendor-partners/LSI/PDFs/Seneca-PSC-LSI.pdf
(which is not me, but is relevant)

- Rich

On Tue, Jul 10, 2012 at 9:19 PM, Bob Friesenhahn
<bfriesen at simple.dallas.tx.us> wrote:
> On Tue, 10 Jul 2012, Jason Usher wrote:
>>
>>
>> But this scares me ...
>>
>> - two different power sources - so the "head unit" can lose power
>> independent of the JBOD device ... how well does that turn out ?
>
>
> Most of your concerns are things which have been normal for fiber channel
> based arrays for quite a few years already.  SAS cables are shorter so there
> is a better chance that everything is on the same power and in the same
> rack.
>
>> From my limited experience, getting everything on the same power helps
>
> with managing things.
>
>
>> Just how well does ZFS v28 deal with these kind of situations, and do I
>> have a good reason to be awfully shy about doing this ?
>
>
> I have been on zfs mailing lists for many years and few of the issues
> reported have been due to ZFS.  Usually problems are due to failing memory,
> bad cables, and SATA drives on SAS expanders.  SAS disks work better in
> large arrays.
>
> There have been people running several hundred disks without problem.
>
> Bob
> --
> Bob Friesenhahn
> bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>
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