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| === Tar (Simplest) === | | === Tar (Simplest) === |
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| It is good to run tar to test write speed, though using it as a backup method leaves much to be desired, so rely on bareos after.
| | See [[LTO Tape]] |
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| See [[LTO Tape]]. Make sure to always disable hardware compression using mt. | |
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| <pre>
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| # mt -f /dev/nst0 compression 0
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| # mt -f /dev/nst0 defcompression -1
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| </pre>
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| === LTFS (Medium) === | | === LTFS (Medium) === |
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| - /dev/tape/by-id/scsi-3500e09efff0f9bb6:/dev/tape/by-id/scsi-3500e09efff0f9bb6 | | - /dev/tape/by-id/scsi-3500e09efff0f9bb6:/dev/tape/by-id/scsi-3500e09efff0f9bb6 |
| </nowiki> | | </nowiki> |
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| === plain tar, dd, ect ===
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| Install mt-st package for tape commands mt:
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| $ sudo yum install mt-st
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| $ sudo mt -f /dev/nst0 status
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| $ sudo tapeinfo -f /dev/nst0 # Get information about drive and tape.
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| Creating a junk data file for testing:
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| $ head -c 10G < /dev/urandom > junkfile_10GB.jnk
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| Disabling compression as it will only result in bottlenecks and lower odds of successful file retreival if the tape is damaged.
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| $ sudo mt -f /dev/nst0 compression 0
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| $ sudo mt -f /dev/nst0 defcompression -1
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| Getting status to confirm the drive has compression disabled:
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| $ sudo mt -f /dev/nst0 status
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| $ sudo tapeinfo -f /dev/nst0
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| There should be a line indicating is is not enabled
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| 'DataCompEnabled: no'
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| LTO6: Density code 0x5a
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| Setting the block size to something the drive likes results in very significant speedups. (from 7MB/s to 170MB/s):
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| I determined the value used by going down a power of two from 1024 to 512
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| $ sudo /usr/bin/time --append --output=tape_time10gb.txt tar -c -v -b 512 -f /dev/st0 junkfile_10GB.jnk
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