Here is an excerpt from a TSM-Data Domain best practiced doc from EMC.
"? ?directory=/tsm/ddr/tsm_dir1,/tsm/ddr/tsm_dir2, /tsm/ddr/tsm_dir3?
This will allow the TSM server to round robin incoming data streams over
each network link. There is
no configuration control over path preferences, and in the event the link
of a given path is not available,
TSM will skip that path and open the next data stream on the next
available path."
The context for this was to mount different directories over different
network links to balance the link utilization.
It indicates it is round robin, but I don't know how authoritative this
is. I couldn't find any information about it in the TSM manuals although
my link utilization is even, which would confirm that it is round-robin.
You could remove the full directories from the device class definition.
This won't prevent reading volumes already created, it will only prevent
new scratch volumes from being created there. Then you can add it back in
later as the data expires and space clears up.
Regards,
Shawn
________________________________________________
Shawn Drew
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rrhodes AT FIRSTENERGYCORP DOT COM
Sent by: ADSM-L AT VM.MARIST DOT EDU
11/11/2011 03:00 PM
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[ADSM-L] Dev Class type FILE with multiple directories
If you have a dev class of type FILE with multiple directories, how does
TSM determine which dir to create a new volumes in?
I've checked everywhere I can think of and the most I can find is comments
that TSM is free to pick any dir to create a new scratch vol in. Assuming
lots of free space in multiple directories specified for one dev class
type file, how does TSM pick which dir to create a file dev in?
What I'm interested in is one of those "what if" questions. If you have a
file dev class (NFS) on a dedup box and its getting full. So you purchase
a new box, set it up, and add it to the devclass as an extra directory.
You now have two directories. If one is full TSM will use the other, but
if both have freespace I'm curious how TSM decides which to use.
Just curious . . .
Rick
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