[Mauiusers] confused about standing reservations

Steve Johnson steve at isc.tamu.edu
Wed Feb 3 16:37:27 MST 2010

I've used SR's with decent success for blocking out access during lab times.

SRCFG[bloc122mw] GROUPLIST=root
SRCFG[bloc122mw] STARTTIME=07:30:00
SRCFG[bloc122mw] ENDTIME=17:00:00
SRCFG[bloc122mw] HOSTLIST=bloc122-[00-32]

I also do pbsnodes -o via cron to mark the nodes offline so that Globus MDS
reports the correct number of available nodes.  It also provides a second
layer of protection against a job starting when it's not suppose to.

It's a different story when using SR's in place of partitions.  I just
couldn't get it to behave as desired in terms of keeping jobs from particular
classes separated, so I went back to partitions.

// Steve

Tom Rudwick wrote:
> I recommend not using standing reservations. We found them to be buggy and
> unreliable. I recommend using cron jobs to create regular reservations.
> Tom
> skip at pobox.com wrote:
>> I'm trying to use standing reservations (Maui 3.2.6p21) to avoid running
>> jobs on certain nodes during work hours.  For example:
>>     SRSTARTTIME[userver171]     07:00:00
>>     SRENDTIME[userver171]       16:00:00
>>     SRPERIOD[userver171]        DAY
>>     SRDAYS[userver171]          MON TUE WED THU FRI
>>     SRHOSTLIST[userver171]      userver171
>>     SROWNER[userver171]         USER:kim
>>     SRMAXTIME[userver171]       5:00:00
>> I interpreted the above to mean that on weekdays jobs can only be run on
>> userver171 by Kim between 07:00 and 16:00.
>> This doesn't seem to work.  Jobs continue to be placed on that machine
>> during the reserved period.
>> Is the assignment of jobs to nodes done dynamically or at the time of job
>> submission? 
>> Thanks,
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