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Tape storage question... | by rockitanski | 2002-11-01 11:08:41 |
| It depends on the tape drive |
by SnArL |
2002-11-01 15:19:27 |
...and the block size used, as well as the backup software. If you are using a fixed blocksize, what could be happening (again, this really depends on the backup software) is each individual file gets its very own tape block or blocks. If your block size is fixed at 32k, and you have 300 files that are 33k in size, you could be wasting 9523200 bytes because each file needs 2 tape blocks. The solution? Use a variable blocksize if your drive/OS supports it. Also remember that your backup software may have additional overhead for storing an index, as well as information about each file. Most good backup software stores enough redundant information to recover from a bad or unreadable block on the tape.
Another factor may be hardware compression. If your tape drive supports hardware compression and your backup software uses software compression, you incur additional overhead as the tape drive attempts to compress data that is already compressed. Use one or the other, but not both. (My experience has been that the tape drive's compression is better than what's provided by the backup software, but I've got a DLT drive. YMMV) |
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[ Reply ] |
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Thanks for the info | by rockitanski | 2002-11-04 07:47:06 |
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