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тАО09-09-2002 06:08 AM
тАО09-09-2002 06:08 AM
Ultrium 230 - Informix config?
I have just installed the much awaited Ultrium 230 on my N4000 cluster. Since the backups are a real pain and real slow, I need to tweak it a bit ... any ideas of how I can ammend these onconfig settings for Informix 7.31 ?
TAPEDEV /dev/level0backup
TAPEBLK 64
TAPESIZE 67108864 # DAT 3355400
I need maximum throughput, and can only think of changing TAPEBLK to 128, but what about TAPESIZE ... dont worry about TAPEDEV - that's a symbolic link to the new Ultrium driver.
I ran HP-UX 11.00, and have the latest patches installed for Ultrium.
Cheers
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тАО09-09-2002 06:14 AM
тАО09-09-2002 06:14 AM
Re: Ultrium 230 - Informix config?
Pete
Pete
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тАО09-09-2002 06:19 AM
тАО09-09-2002 06:19 AM
Re: Ultrium 230 - Informix config?
Pete
Pete
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тАО09-09-2002 07:14 AM
тАО09-09-2002 07:14 AM
Re: Ultrium 230 - Informix config?
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тАО09-09-2002 09:17 AM
тАО09-09-2002 09:17 AM
Re: Ultrium 230 - Informix config?
But what should the TAPESIZE setting be for the Ultrium which can take 200GB?
thanks
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тАО09-09-2002 09:54 AM
тАО09-09-2002 09:54 AM
Re: Ultrium 230 - Informix config?
I'm having a hard time finding the Informix doc I need to look at (Informix O D S Backup and Archive Guide), so I ran it by my DBA. He "thinks it's 2^32-1 Kb or over 4096 Gb." He's "pretty sure its an unsigned long int expressing tape size in KB." And, he also picked up on TAPEBLK, "too small and too many gaps on the tape." Crank that block size way up and run some comparisons.
I really doubt that you're going to be able to do that Ultrium drive justice with ontape - sorry to repeat myself but I just can't see it happening with a facility that was designed with DAT tapes in mind.
Pete
Pete
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тАО09-10-2002 05:53 AM
тАО09-10-2002 05:53 AM
Re: Ultrium 230 - Informix config?
We get 400Gb onto an Ultrium 1, the compression is so good, because we use 64 bit informix / HP-UX. So you might be able to bump the TAPESIZE up to 800Mb even for an Ultrium 2.
I recommend you set it very high and see how much you actually get onto a tape.
Ensure that you have the correct minor number for the tape device file, to enable hardware compression. The auto-installer doesn't always use the correct one when creating device files.
Here are mine.
crw-rw-rw- 2 bin bin 205 0x071000 Nov 30 2001 6m
crw-rw-rw- 2 bin bin 205 0x071080 Nov 30 2001 6mb
crw-rw-rw- 2 bin bin 205 0x071040 Nov 30 2001 6mn
crw-rw-rw- 2 bin bin 205 0x0710c0 Nov 30 2001 6mnb
Set the TAPEBLK to at least 128 and preferrably 256 for a device that fast.
> 3 points please ;-) (nearing my 2nd hat)
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тАО09-10-2002 05:57 AM
тАО09-10-2002 05:57 AM
Re: Ultrium 230 - Informix config?
For an Ultrium tape drive, the block size recommendation is 32K. There is no point in increasing it further.
See below for details:
http://www.hp.com/products1/storage/products/tapebackup/ultrium_tapedrives/ultrium230/infolibrary/whitepapers/ultperfpress.pdf
HTH,
Vince