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Re: [ADSM-L] tape drive usage priority between storage pools

2010-03-11 14:09:26
Subject: Re: [ADSM-L] tape drive usage priority between storage pools
From: "Allen S. Rout" <asr AT UFL DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Thu, 11 Mar 2010 14:08:42 -0500 
>> On Thu, 11 Mar 2010 08:32:20 +0330, Mehdi Salehi <ezzobad AT GOOGLEMAIL DOT 
>> COM> said:

> Say there is not disk storage pool and two clients from the two tape
> storage pools accidentally sent their backups exactly at the same
> time. Which one graps the tape drive first?

"exactly" the same time, isn't.  One of them is first, even if it's a
matter of which thread gets executed first.

In any case, there's only one lock for a tape drive.  When that DRIVE
is moved from IDLE to WAITING FOR MEDIA, the other process is out of
luck, it will wait.

- Allen S. Rout
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