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100 Sun StorageTek SAM Archive Configuration and Administration Guide • Version 4, Update 6, 04/07

■ Save your archive logs. The archive logs provide information that is essential to

recovering data, even when the Sun StorageTek SAM software is unavailable.

Keep these logs in a safe place in the event of a catastrophic disaster during which

the Sun StorageTek SAM software is unavailable.

■ Use regular expressions for volumes. Allow the system to put files on many

different volumes. Volume ranges (specified with regular expressions) allow the

system to run continuously. Using specific volume names for archive set copies

can rapidly fill a volume, causing undue workflow problems as you remove one

piece of media and replace it with another.

■ Base your archive interval on how often files are created and modified, and

whether you want to save all modification copies. Remember that the archive

interval is the time between file system scans. A very short archive interval keeps

the archiver scanning almost continuously.

■ Consider the number of file systems you are using. Multiple Sun StorageTek SAM

file systems generally increase the performance of the archiver over a single Sun

StorageTek SAM file system. Multiple file systems can be scanned in considerably

less time than a single file system.

■ Use directory structures to organize your files in a Sun StorageTek SAM file

system. To maximize performance, do not place more than 10,000 files in a

directory.

■ Always make a minimum of two file copies on two separate volumes. Putting

data on a single media type puts your data at risk if physical problems with the

media occur.

■ Make sure you are backing up your metadata (directory structure, file names, and

so on) by using samfsdump(1M) on a regular basis. The metadata is stored in an

archive set that has the same name as the file system. You can use this

information to recover a file system in the event of a disaster. If you do not want

to back up your metadata, you can prevent it from being archived by assigning

that archive set to a nonexistent VSN. For more information on preserving

metadata, see the Sun StorageTek Storage Archive Manager Troubleshooting Guide or

the Sun StorageTek Storage Archive Manager Installation and Upgrade Guide.

The Preview Queue

The archiver and stager processes both can request that media be loaded and

unloaded. If the number of requests exceeds the number of drives available for

media loads, the excess requests are sent to the preview queue.

Archive and stage requests in the preview queue are those that cannot be

immediately satisfied. By default, preview requests are satisfied in first-in-first-out

(FIFO) order.

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US Robotics 7931 Guía de usuario Pagina 124