[G5] Drives????

[Zane H. Healy]

At 10:26 AM -0400 7/27/05, Jon Allen Boone wrote:
>On Jul 27, 2005, at 02:32, Zane H. Healy wrote:
>>
>>[1] I can never remember what JBOD stands for, it's an external HD 
>>box, typically with fans that pull air from the front over the 
>>HD's. The disks themselves are in canisters, that can easily be 
>>removed from the box.  They're often rack mounted.
>
>   Just a Bunch Of Disks (JBOD) usually refers to a concatenated disk 
>set.  It's similar to RAID 0 [striped disk set] except that the 
>writes are not interleaved across the disks.  When the first drive 
>in the JBOD set is full, writing begins on the 2nd, etc.  Like RAID 
>0, there is no redundant storage of data, so if a drive fails the 
>data on that drive is lost.

Totally off-topic, but...

That's got to be one of the craziest acronyms I've heard, it's no 
wonder I can't ever remember it.  With the JBOD I'm familiar with, 
it's setup the way you want it to be rather than the way you 
describe.  At work we've done RAID 0, 1, and 5, whichever makes the 
most sense, including just individual 1-8 disks.  Basically it's what 
you want, and what the OS or SCSI Adapter it's plugged into is 
capable of.

I have a couple small 3 disk enclosures that I use on a VMS system. 
The two data disks in each use Volume Shadowing (basically RAID 1), 
and one disk is unprotected.  The Shadowed/Mirrored disks each have 
one physical disk in each box.

			Zane

-- 
--
| Zane H. Healy                    | UNIX Systems Administrator |
| healyzh at aracnet.com (primary)    | OpenVMS Enthusiast         |
|                                  | Classic Computer Collector |
+----------------------------------+----------------------------+
|     Empire of the Petal Throne and Traveller Role Playing,    |
|          PDP-10 Emulation and Zane's Computer Museum.         |
|                http://www.aracnet.com/~healyzh/               |