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тАО01-27-2004 07:49 AM
тАО01-27-2004 07:49 AM
I need to learn how mirrordisk/UX works. Right now I'm reading http://docs.hp.com/hpux/pdf/B2355-90742.pdf which is a great file for recipes on how to do specific things but it doesn't explain the how's ( for mirrordisk ).
In the beginning of the chapter the author states:
###
If you would like to learn more about basic mirroring tasks, it is
suggested that you refer to the book Disk and File Management Tasks on
HP-UX published by Prentice Hall PTR, 1997.
###
which I cant find. Is there any other files/sites that I could read ??
Thanx.
O
Solved! Go to Solution.
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тАО01-27-2004 07:52 AM
тАО01-27-2004 07:52 AM
Re: MirrorDisk/UX documentation
Look at the following document "Managing Systems and Workgroups: A Guide for HP-UX System Administrators " at docs.hp.com
http://docs.hp.com/hpux/onlinedocs/B2355-90742/B2355-90742.html
Look at "Managing Disks and Filesystems" Chapter. You should get all the information needed.
-Sri
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тАО01-27-2004 08:00 AM
тАО01-27-2004 08:00 AM
Re: MirrorDisk/UX documentation
Thanks but thats the file I'm talking about in my post...
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тАО01-27-2004 08:16 AM
тАО01-27-2004 08:16 AM
SolutionThe HP-UX SW Recovery handbook - specifically the LVM chapter - has a good section on Mirror-UX.
Here's the link to the LVM chapter:
http://www1.itrc.hp.com/service/iv/docDisplay.do?docId=prodITRC/DE_SW_UX_swrec_EN_01_E/LVM.pdf
You can get to the entire handbook via the "Navigate Knowledge Trees" link of the ITRC home page.
HTH,
Jeff
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тАО01-27-2004 08:25 AM
тАО01-27-2004 08:25 AM
Re: MirrorDisk/UX documentation
Rgds,
Jeff
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тАО01-27-2004 09:35 AM
тАО01-27-2004 09:35 AM
Re: MirrorDisk/UX documentation
Disk and File Management Tasks on Hp-Ux (Hewlett-Packard Professional Books) by Tom Madell, Thomas Madell (Paperback - January 1997)
Books:
Buy new: $29.40 Used & new from $24.50 Special Order
One thing to remember about MirrorDisk: whatever you do with it, the host (computer) performs the processing. That means if you're mirroring, the process of keeping disks synchronized is being done by your computer and those resources are not available for the regular "work" that the computer is doing. That's one reason that people invest in external disk arrays (EMC, Hitachi, HP) -- they may perform RAIDing for you, thus offloading the resource drain from the host.
HTH,
Mic
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тАО01-27-2004 09:40 AM
тАО01-27-2004 09:40 AM
Re: MirrorDisk/UX documentation
Jeff got the stuff for you.
Have a good day.
-Sri
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тАО01-27-2004 09:44 AM
тАО01-27-2004 09:44 AM
Re: MirrorDisk/UX documentation
That's true to some extent, but remember most of the double-write penalty is offset by the ability to direct reads to 2 different devices - i.e. the next read is always placed on the device with the smallest queue.
But, in my mind, mirrors are about safety & availability. In our shop all our local or non-RAID storage is mirrored so drive failures do not cause us downtime.
You really have to look at Mirror-UX that way - it's not intended for performance - it's for availability. I wouldn't even think about using MC/SG w/o Mirror-UX.
My 2 cents,
Jeff
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тАО01-27-2004 09:50 AM
тАО01-27-2004 09:50 AM
Re: MirrorDisk/UX documentation
How would you handle a SG cluster with a 300GB database hosted on a Symmetrix/Hitachi/XP (database only active on one node)? MirrorDisk on the host or let the array handle it?
Just trying to understand your perspective. Sorry to be off-topic.
Mic
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тАО01-27-2004 09:53 AM
тАО01-27-2004 09:53 AM
Re: MirrorDisk/UX documentation
Would you want to boot off of it?
Back at ya,
Jeff (Who keeps vg00 safely close to home & mirrored)