On Sat, Mar 16, 2013 at 2:27 PM, Jim Klimov <jimkli...@cos.ru> wrote:

> On 2013-03-16 15:20, Bob Friesenhahn wrote:
>> On Sat, 16 Mar 2013, Kristoffer Sheather @ CloudCentral wrote:
>>  Well, off the top of my head:
>>> 2 x Storage Heads, 4 x 10G, 256G RAM, 2 x Intel E5 CPU's
>>> 8 x 60-Bay JBOD's with 60 x 4TB SAS drives
>>> RAIDZ2 stripe over the 8 x JBOD's
>>> That should fit within 1 rack comfortably and provide 1 PB storage..
>> What does one do for power?  What are the power requirements when the
>> system is first powered on?  Can drive spin-up be staggered between JBOD
>> chassis?  Does the server need to be powered up last so that it does not
>> time out on the zfs import?
> I guess you can use managed PDUs like those from APC (many models for
> varied socket types and amounts); they can be scripted on an advanced
> level, and on a basic level I think delays can be just configured
> per-socket to make the staggered startup after giving power from the
> wall (UPS) regardless of what the boxes' individual power sources can
> do. Conveniently, they also allow to do a remote hard-reset of hung
> boxes without walking to the server room ;)
> My 2c,
> //Jim Klimov
Any modern JBOD should have the intelligence built in to stagger drive
spin-up.  I wouldn't spend money on one that didn't.  There's really no
need to stagger the JBOD power-up at the PDU.

As for the head, yes it should have a delayed power on which you can
typically set in the BIOS.

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