Hello,
I'm not sure how Buta fits into this, not having used it but it sounds like you
have migpr (number of migration processes) for the storage pool set to 5, hence
ADSM using 5 drives for migration.
update the storage pool so migpr is equal to the number of drives you want ADSM
to use for migration.
As to the tapes still being mounted after two mins, If you had just done a
backup and the migration threshold was overrun then ADSM will be using those
two tapes for migration. If they are just sitting there doing nothing then I
dont know, but it may be something to do with having migpr set to 5 and only
having two drives available in the device class used for migration.
Matthew.
>>> "J. O'Neall" <oneall AT IN2P3 DOT FR> 11/09 2:32 pm >>>
I need some help understanding how ADSM uses tapes, especially when there
is no available disk storage pool.
I've just started trying the use of the buta interface from AFS to ADSM.
I'm not sure my question is restricted to the use of buta, tho, so will
those who know about ADSM's use of tapes please keep reading.
Yesterday (yes, Sunday), I backed up about 35GB of disk via 4 buta ports (2
each on 2 stations). All files went to a 4GB disk storage pool, with
reclamation set to hi/lo=60/30. It worked, but I saw ADSM with up to 5
tapes mounted for the single migration process which lasted for the duration
of the backup. My feeling was that it wanted a tape for each buta "stream",
if I may call it that.
So I restricted the tape device class to only one tape and started 2 streams
of backup. One got its tape and went ahead to completion. The other got
stuck. I had to open the device class up to 2 tapes so it could mount a
second one, then the 2nd stream came to life. But now, 10 minutes later,
both tapes are still mounted, and the tape dismount period is set to 2
minutes.
Can anybody help me to understand what's going on?
Thanks in advance. John
-----
John O'Neall
John O'Neall
Centre de Calcul de l'IN2P3
** IMPORTANT INFORMATION **
This message is intended only for the use of the person(s) ("the Intended
Recipient")
to whom it is addressed. It may contain information which is privileged and
confidential
within the meaning of applicable law. Accordingly any dissemination,
distribution, copying
or other use of this message or any of its contents by any person other than
the Intended
Recipient may constitute a breach of civil or criminal law and is strictly
prohibited.
If you are not the Intended Recipient please contact the sender and dispose of
this email
as soon as possible. If in doubt contact the Tibbett & Britten Group Network
Administration
Department on 01707 391010 (UK).
|
