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тАО06-20-2009 12:00 AM
тАО06-20-2009 12:00 AM
I need to setup multipathing on Redhat 4.3 and EVA4000 storage but it seems HP's Multi-path Device Mapper Kit requires Redhat 4.5 and above!
Any help or ideas?
Thanks
Solved! Go to Solution.
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тАО06-20-2009 01:35 AM
тАО06-20-2009 01:35 AM
SolutionWhy not use the multipath software supplied with Linux - it works fine.
Attached is a doc I used to get mpathd running under RHEL4u2 (though I had to go to 4u4 not long after to get NFS file locking).
The only problems I have come across so far with the new EVAs is the number of paths you now see. We restrict it to the minumum that we can that still provides us with resilience. Had one sysem with 130 LUNs, an EVA that had 8 paths - so that gave me 1040 devices - and that caused me issues with multipath and devices! Juggled it so the total number of LUNs was less that 255 and all was OK!
Colin
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тАО06-20-2009 02:41 AM
тАО06-20-2009 02:41 AM
Re: Multipath on Redhat 4.3
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тАО06-20-2009 03:04 AM
тАО06-20-2009 03:04 AM
Re: Multipath on Redhat 4.3
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тАО06-27-2009 12:12 AM
тАО06-27-2009 12:12 AM
Re: Multipath on Redhat 4.3
Our ASM disk is defined as a raw device for /dev/sda and now I think I have to change the path to /dev/mapper/mpath0
need some more help how should I do this...
Thanks
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тАО06-27-2009 02:12 AM
тАО06-27-2009 02:12 AM
Re: Multipath on Redhat 4.3
Note that there is a timing issue with the start sequence (if I remember correctly there is no dependancy between ocssd and asm, and sometimes one starts before the other is finished).
Colin.
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тАО06-27-2009 03:04 AM
тАО06-27-2009 03:04 AM
Re: Multipath on Redhat 4.3
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тАО06-28-2009 09:23 AM
тАО06-28-2009 09:23 AM
Re: Multipath on Redhat 4.3
Col
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тАО06-29-2009 10:53 PM
тАО06-29-2009 10:53 PM
Re: Multipath on Redhat 4.3
In a multipathed configuration, paths may come and go, but as long as each necessary disk is accessible by at least one path, the application/database can keep running.
To make the ASM use /dev/mapper/mpath* devices, please see:
http://www.oracle.com/technology/tech/linux/asmlib/multipath.html
MK