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тАО09-22-2005 06:55 PM
тАО09-22-2005 06:55 PM
when i do:
mksf -d stape -I 0 -b 147 -c 16
...what is 16? are there different compression codes? what is the best compression code i can use for an sdlt220 drive?
with this command, i was able to create:
/dev/rmt/c2t9d0D147C16
but when i tried using it with:
tar -xvf /dev/rmt/c2t9d0D147C16 /tmp
there's an error:
tar: cannot open /dev/rmt/c2t9d0D147C16
what can i do so i can use this?
Solved! Go to Solution.
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тАО09-22-2005 08:21 PM
тАО09-22-2005 08:21 PM
Re: density code of sdlt220 and compression code 16
To knw the density code of ur drive try http://sunsolve.sun.com/search/document.do?assetkey=1-9-30-1
To knw the mksf in details, http://docs.hp.com/en/B9106-90008/mksf.1M.html
I hope Sony SDLT1-320 is the best for sdlt220 drive.
And about query on tar: cannot open plz visit http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=954268
Thanks,
Mugil
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тАО09-22-2005 09:25 PM
тАО09-22-2005 09:25 PM
Re: density code of sdlt220 and compression code 16
SDLT220 format is 0x48, but you can also use 0x90 (compression off) or 0x91 (compression on), although the latter are not preferred by Quantum according to the SDLT220/320 SCSI Reference Manual (anyone can read it on Quantum's web site).
147 decimal is 0x93, which is SDLT320 format (compression on). So if you have a SDLT220 drive, not sure why you'd be using that density value. It can't write SDLT320 format.
As for the compression field, when compression is used, you have to specify which compression algorithm should be used. Maybe back in the dark ages, devices actaully had multiple algorithms, but in the 21st century, everything I've ever seen only supported one algorithm. For SDLT220, that's 0x10, or 16 decimal, the only valid value for that setting. That's why -c 16.
Now, is the -c 16 necessary since you specified a 0x9? density code rather than 0x48? I don't know. Guess it can't hurt.
Thanks,
Scott
HP Support
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тАО09-23-2005 01:32 AM
тАО09-23-2005 01:32 AM
Re: density code of sdlt220 and compression code 16
Thank you very much for your explanation! It really helped a lot since I've been trying to find these information in the internet (and so far, I did not get anything close to your answer). Anyway, since I'm using SDLT220 drive, what is its equivalent density code? Or what can I use? So that when I do mksf again, I can specify this in the -b option. Thank you very much again.
Regards,
Carmela
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тАО09-23-2005 01:38 AM
тАО09-23-2005 01:38 AM
Re: density code of sdlt220 and compression code 16
What density code can I use so that my sdlt220 drive will do compression? If 147 is for sdlt230, what is for the sdlt220?
Thanks again.
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тАО09-23-2005 01:55 AM
тАО09-23-2005 01:55 AM
Re: density code of sdlt220 and compression code 16
Are you sure that the problem is related to the devicefiles. I have not used any SDLT drives myself but, for all types of drives I have tested, the default device files (created automatic at reboot or using the insf command) are compressed.
Is perhaps your backup data already compressed or, is compression disabled in the drive (don't sure if that is possible with sdlt driver).
Which OS version are you using ?
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тАО09-23-2005 07:49 AM
тАО09-23-2005 07:49 AM
Re: density code of sdlt220 and compression code 16
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тАО09-23-2005 10:45 AM
тАО09-23-2005 10:45 AM
Re: density code of sdlt220 and compression code 16
Hi Leif,
I already tried using the default device files but unfortunately, I didn't get the compression (not even 1%). My backup software already is set to compress = hardware. I'm saving 140GB of data, but only less 110GB can be save into the SDLT1 tape. The 140GB of data should fit into 1 SDLT1 tape right? Would you know how can I check if the compression of the tape drive itself is "active" or turned on?
Before I bought this sdlt220, I was using a dlt8000 drive and I had no problems. But since my data now is more than 80G, I decided to buy an sdlt220.
Thanks very much!
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тАО09-23-2005 11:11 AM
тАО09-23-2005 11:11 AM
Re: density code of sdlt220 and compression code 16
From the manual of the sdlt220, it says the compression is defaulted to "on".
I created a device file from Scott's 145 density and I was able to test the tar command to that drive successfully.
Thanks very much again.
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тАО09-24-2005 06:42 PM
тАО09-24-2005 06:42 PM
Re: density code of sdlt220 and compression code 16
My problem has now been solved; I was able to backup using the sdlt220 and it is compressing. The answer that solved this is Scott's 145 density. Thank you very much for all your help.