Date: Thu, 20 Apr 2006 13:29:04 -0400
From: Allen S. Rout <asr AT UFL DOT EDU>
Reply-To: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: collocation groups
On Wed, 19 Apr 2006 16:50:56 -0700, "Gill, Geoffrey L." <GEOFFREY.L.GILL AT SAIC
DOT COM> said:
If 10 nodes are in one group will it only mount one tape even if no other
tape drives are busy?
Yes; one stream per collocgroup, just like you would get one stream
per node. (even if you're collocating by filespace, he grumpily
grumped)
If I have a directory disk pool that is cached will it still go to
one tape after migration or will collocation groups affect that?
What I see leads me to believe the answer is yes. I am seeing
multiple tapes for the directory tape pool with little to no
data. Do folks still use this option?
[no clue]
Why do tapes that are not full show capacity of 381GB yet when they
go full only show about 200GB? Do I need to force compression on
with the drives or something? (LTO2's, 3584 Lib)
The unfull tapes just parrot back to you the Estimated Capacity you
set on the device class.
If you're getting 200G on a LTO2, might you have set the devclass
FORMAT to be something other than DRIVE? It sure sounds like you're
writing uncompressed.
- Allen S. Rout
