Hi,

I currently have a 1U server (Sun X2200) with 2 LSI HBA attached to a
Supermicro JBOD chassis each one with 24 disks , SATA 1TB, and so far so
good..
So i have a 48 TB raw capacity, with a mirror configuration for NFS
usage (Xen VMs) and i feel that for the price i paid i have a very nice 
system.


Bruno

Ian Allison wrote:
> Hi,
>
> I know (from the zfs-discuss archives and other places [1,2,3,4]) that
> a lot of people are looking to use zfs as a storage server in the
> 10-100TB range.
>
> I'm in the same boat, but I've found that hardware choice is the
> biggest issue. I'm struggling to find something which will work nicely
> under solaris and which meets my expectations in terms of hardware.
> Because of the compatibility issues, I though I should ask here to see
> what solutions people have already found.
>
>
> I'm learning as I go here, but as far as I've been able to determine,
> the basic choices for attaching drives seem to be
>
> 1) SATA Port multipliers
> 2) SAS Multilane Enclosures
> 3) SAS Expanders
>
> In option 1, the controller can only talk to one device at a time, in
> option 2 each miniSAS connector can talk to 4 drives at a time but in
> option 3 the expander can allow for communication with up to 128
> drives. I'm thinking about having ~8-16 drives on each controller
> (PCI-e card) so I think I want option 3. Additionally, because I might
> get greedier in the future and decide to add more drives on each
> controller I think option 3 is the best way to go. I can have a
> motherboard with a lot of PCIe slots and have one controller card for
> each expander.
>
>
> Cases like the Supermicro 846E1-R900B have 24 hot swap bays accessible
> via a single (4u) LSI SASX36 SAS expander chip, but I'm worried about
> controller death and having the backplane as a single point of failure.
>
> I guess, ideally, I'd like a 4u enclosure with 2x2u SAS expanders. If
> I wanted hardware redundancy, I could then use mirrored vdevs with one
> side of each  mirror on one controller/expander pair and the other
> side on a separate pair. This would allow me to survive controller or
> expander death as well hard drive failure.
>
>
> Replace motherboard: ~500
> Replace backplane: ~500
> Replace controller: ~300
> Replace disk (SATA): ~100
>
>
> Does anyone have any example systems they have built or any thoughts
> on what I could do differently?
>
> Best regards,
>     Ian.
>
>
> [1] http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg27234.html
> [2] http://www.avsforum.com/avs-vb/showthread.php?p=17543496
> [3] http://www.stringliterals.com/?p=53
> [4] http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg22761.html
>
>
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss@opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>

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