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% free space issue of the Storage Group after initialization

 
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lemon123

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Joined: 12 Feb 2013
Posts: 10
Location: India

PostPosted: Fri Feb 15, 2013 6:34 pm    Post subject: % free space issue of the Storage Group after initialization
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Hi ,

This is my first post in IBMMAINFRAMES...

Am facing some problems while initializing the storage group.

After initialization (i.e..ONLINE/OFFLINE) the storage group volumes, the % free space of the storage group in ISPF .6 showing lesser % free(< 99 %) space,but all the volumes inside the same storage group is showing 99% free space.

am facing this issue for last two months only,previously it worked fine.
Appreciate your effort & thanks in advance!!!


Thanks & Regards,
Geeyem
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8030
Location: Bellevue, IA

PostPosted: Fri Feb 15, 2013 10:11 pm    Post subject:
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So, what changed two months ago? This could be due to an operating system upgrade, or a change in the allocation of volume data, etc -- but something must have been changed for you to notice a difference.
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lemon123

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Joined: 12 Feb 2013
Posts: 10
Location: India

PostPosted: Sat Feb 16, 2013 12:07 am    Post subject:
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Hi Robert,

I don't know what has changed in these two months...
we are using this storage group mainly for backup purpose...
once the backedup datasets from the storage group are moved to tape we deleted the datasets and we start the initialization.This is our normal process..

but in recent days, after initialization we are facing this issue...

we are having more than 12 storage groups ,but we are facing in two storage groups..

Thanks in advance

Thanks & Regards,
lemon123
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Akatsukami

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Joined: 03 Oct 2009
Posts: 1753
Location: Bloomington, IL

PostPosted: Sat Feb 16, 2013 12:10 am    Post subject:
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lemon123 wrote:
I don't know what has changed in these two months...

Well, neither do we. However, since you are on site, and we are not, you have a better chance of finding out than we do.
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lemon123

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Joined: 12 Feb 2013
Posts: 10
Location: India

PostPosted: Sat Feb 16, 2013 4:13 am    Post subject:
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Hi ,

we didn't upgraded the system during the time,

No datasets are present in the storage group but still showing lesser free space

Any other possibilities to get the 99% free space.
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Pete Wilson

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Joined: 31 Dec 2009
Posts: 440
Location: London

PostPosted: Mon Feb 25, 2013 8:18 pm    Post subject:
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When you first INITIALISE volumes into a Storgrp ISMF does not know what capacity is in there and often shows a meaningless value, but the space is available. Doing some temporary allocations into the pool will sort it out as it forces the SMS DINTERVAL process to look at the volumes. Use VOL=(,,,59) to froce multi-volume allocations, perhaps with a Gauranteed Space Storclas so as many volumes get allocated on as possible. They only need to be small sized files, and can be deleted almost immediately as DINTERVAL is defaulted to 150ms (in SYS1.PARMLIB(IGDSMSxx) )
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pash_thane

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Joined: 15 Oct 2010
Posts: 1
Location: Mumbai

PostPosted: Tue Feb 26, 2013 12:37 pm    Post subject: Reply to: % free space issue of the Storage Group after init
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Hi,

I have faced the similar issue in our setup. Try following and this should work for sure.

1. Alter the storage class from ISMF Panel and make Guaranteed Space parameter as "Y".
Changes to be made for Storage class Name for which you are facing % less space issue.
2. Do SCDS validation and activation
3. Now create test data set (1 track each) on all the volumes
4. Now check % free space on all volumes for that Storage Group (It should show %99)
5. You may delete temp data sets
6. Revert "Guaranteed" space changes

Regards,
Prashant
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