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тАО10-11-2009 01:04 AM
тАО10-11-2009 01:04 AM
I got an issue from backup admin "Could you please activate the compression on the drives, as this has direct effect to the capacity of the tape library"
My host server is ia64 hp superdome server SD64B.
Regards,
Solved! Go to Solution.
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тАО10-11-2009 01:56 AM
тАО10-11-2009 01:56 AM
SolutionThis is a samplie ioscan. Note the different device paths like /dev/rmt/2mnb /dev/rmt/c21t4d0BESTn. Anywhere where you see BEST you see FIRMWARE TAPE DRIVE COMPRESSION. Note: the little letters at the end of each, n, b, or nothing. Double check the man pages, but 'n' is no rewind, b is Berkeley, nothing is ATT unix.
What you do is note the device that you're currently using in your script, like /dev/rmt/0mb, and find its compression counter part, //dev/rmt/c21t4d0BESTb.
Work with your backup admin re: the no rewind, rewind, etc. stuff.
# ioscan -fnC tape
Class I H/W Path Driver S/W State H/W Type Description
==================================================================
=======
tape 0 1/0/8/0/0.1.10.255.14.4.0 stape CLAIMED DEVICE HP Ultrium 2-SCSI
/dev/rmt/0m /dev/rmt/0mnb /dev/rmt/c12t4d0BESTn
/dev/rmt/0mb /dev/rmt/c12t4d0BEST /dev/rmt/c12t4d0BESTnb
/dev/rmt/0mn /dev/rmt/c12t4d0BESTb
tape 2 1/0/10/0/0.1.10.255.14.4.0 stape CLAIMED DEVICE HP Ultrium 2-SCSI
/dev/rmt/2m /dev/rmt/2mnb /dev/rmt/c21t4d0BESTn
/dev/rmt/2mb /dev/rmt/c21t4d0BEST /dev/rmt/c21t4d0BESTnb
/dev/rmt/2mn /dev/rmt/c21t4d0BESTb
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тАО10-11-2009 02:00 AM
тАО10-11-2009 02:00 AM
Re: Compression to take backup on tape drives
Unless things have changed recently, firmware and software compression don't work together. So verify with your backup admin that software compression is not being used, else, WTF?
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тАО10-11-2009 04:37 AM
тАО10-11-2009 04:37 AM
Re: Compression to take backup on tape drives
Regards,
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тАО10-11-2009 07:03 AM
тАО10-11-2009 07:03 AM
Re: Compression to take backup on tape drives
things *have* changed. most drives (like LT0's) use some from of Loss-less compression. See "LTO-DC" here: http://en.wikipedia.org/wiki/Linear_Tape-Open
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тАО10-11-2009 07:49 AM
тАО10-11-2009 07:49 AM
Re: Compression to take backup on tape drives
Wikipedia! You want you site reference from Wikipedia?
I, ...
...don't think I can do that.
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тАО10-11-2009 10:24 AM
тАО10-11-2009 10:24 AM