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SHOW DEVICE/FULL Free Blocks > Total Blocks ?

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Scot Newton
Advisor

SHOW DEVICE/FULL Free Blocks > Total Blocks ?

Have not seen this before, but a customer of ours states that when they issue "SHOW DEV/FULL DSA1", the Free blocks count (71777457) is greater than the Total Blocks count (71132000). Anyone familiar with this condition?
6 REPLIES
Richard W Hunt
Valued Contributor
Solution

Re: SHOW DEVICE/FULL Free Blocks > Total Blocks ?

First thing I would do is, ASAP, run an Analyze/Disk/Repair on the volume.

Second, there are some SAN disks where the disk presented to the system can change dynamically. I can (barely) imagine that something dynamic happened. See if the problem goes away by dismounting and remounting the disk. (You would have had to do that to do a proper ANALYZE/DISK operation anyway.)
Sr. Systems Janitor
Hoff
Honored Contributor

Re: SHOW DEVICE/FULL Free Blocks > Total Blocks ?

Sometimes this can be benign, and sometimes not.

The free block count is stored in a lock value block, and it can become skewed. (Older releases had more opportunities for skewed values; newer releases are better here.)

I'd get the disk offline and analyze it, as was previously recommended.

Patch to current for whatever OpenVMS release is here, too.
Scot Newton
Advisor

Re: SHOW DEVICE/FULL Free Blocks > Total Blocks ?

Thanks.
This is an Alpha running 7.3-1, so the assessment that it is more liable to occur on older versions may apply here. Will request customer to analyze/repair their disk.
GuentherF
Trusted Contributor

Re: SHOW DEVICE/FULL Free Blocks > Total Blocks ?

Happens whenever a node "disappears" in the cluster without having its disks dismounted locally. And on to the system rebooted with mounting the disk /NOREBUILD.

/Guenther
Scot Newton
Advisor

Re: SHOW DEVICE/FULL Free Blocks > Total Blocks ?

Thanks to all involved. Issue was resolved by:
$ SET VOLUME/REBUILD=FORCE DSA1:
Scot Newton
Advisor

Re: SHOW DEVICE/FULL Free Blocks > Total Blocks ?

Thanks to all involved, issue was resolved by:
$ SET VOLUME/REBUILD=FORCE DSA1: