On Sat, 18 Jun 2011, [email protected] wrote:

> I've been looking at dense storage myself;  I'be been looking
> at the 36 in 4u stuff from supermicro:
> http://www.supermicro.com/products/chassis/4U/847/SC847E16-RJBOD1.cfm
> (external disk only chassis with 45 disks)
>
> or
> http://www.supermicro.com/products/chassis/4U/847/SC847E2-R1400LP.cfm
> which is a 2u server chassis integrated into the above (ends up making
> for only 36 disks)
>

I have both of these in production for a backup server... the 36 bay one 
as the head node, and two of the 45 bay units attached to it.  They work 
well with both SATA and SAS drives, but there can be problems with using 
expanders and SATA drives.  Best bet is to go with SAS if you can.  These 
chassis do not support interposers.

> Those of you who actually use top-load disk bins, how does that
> work out?  are your cable management arm things really good enough that you
> can reliably slide that guy out while the system is running?  or do you
> just leave in a lot of hot spares and migrate off the data when you
> start running out of spares?
>

If you can do the cable management right the cable management arms do 
work, and you can slide the units out and do hot-swap replacements. 
Ideally you want to have sufficient spares to not have to do this often or 
immediately.  I have done this with Sun X4500 Thumpers, as well as the 
units Doug linked to.  I currently have three of the 4U 60-bay chassis 
from DataON.  They're actually manufactured by Newisys and are resold 
through a number of vendors.  The only downside is they are very deep.  I 
have 39" Wrightline racks and had to get left-angle power cords so things 
wouldn't stick out the back.  The units come with these snake like 
management arms that are pretty nice, but the rack depth prevents us from 
using them and still have a rear door on.

-phillip
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