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May 06, 2016

Options for STORE You May Not Know

StorehouseSTORE is the default backup tool for every HP 3000, but this bedrock of backup has options which might exceed expectations for a subsystem utility. Gilles Schipper, the support guru of three-plus decades on the 3000, told us about a few STORE sweet spots.

To start, using the :MAXTAPEBUF option can cut a four-hour backup to three hours or less. Schipper says that increasing the buffer size default to 32K, from the usual 16K, speeds up the backup when STORE sees MAXTAPEBUF. "That's a pretty good payback for one option."

Backups don't need to be specified with an @.@.@ command to be complete. "People should really be using the forward slash," he says, "because it's easy to accidentally omit the Posix file structure if you're not careful constructing your fileset backup." The slash is so much better that a backup specified by HP's TurboStore will replace any @.@.@ operation with "./" Combining @.@.@ with exclusions can lead to omitting files which should have been in a backup.

Schipper says that including a directory on a backup is smart, but private volumes in use on a 3000 need more than :directory as an option.

"If you're using private volumes and the directory option, you'll only get the system volume directory — and you will not get the private volume directories," he says. The backup must explicitly specify the volumes through the ONVS= command, using the long name of the private volume.

The partdb option on a STORE command ensure that any 3000 databases which are incomplete will get backed up. Without partdb, if a root file "doesn't have its corresponding data sets, the root file won't get stored. It's silly, but partdb ensures they get stored." A privileged file can also look like a partial database, so partdb brings those files into a STORE backup.

A 3000 with HP's TurboStore, rather than just the default STORE, can take advantage of the :online command. "It will give you zero downtime, if you have that version from HP," Schipper says. But that begins to drift away from the no-cost STORE options available to any HP 3000 administrator or owner.

05:47 PM in Hidden Value, Homesteading | Permalink

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