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тАО06-25-2007 02:58 PM
тАО06-25-2007 02:58 PM
We are having some issues with failover and failback and would like to know if someone here has this working the way it should be.
Thanks.
Solved! Go to Solution.
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тАО06-25-2007 08:01 PM
тАО06-25-2007 08:01 PM
Re: linux and eva 5000
Tell us more about your system.
HBA choice is important.
With HP servers and qlogic cards you should not be having any issues.
Details on your configuration would be very helpful in moving to resolution. What error is received in /var/log/messages when failover does not work?
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тАО06-25-2007 10:33 PM
тАО06-25-2007 10:33 PM
Re: linux and eva 5000
Yes I've had this working..
What issues are you seeing ?
Cheers,
Rob
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тАО06-26-2007 01:23 AM
тАО06-26-2007 01:23 AM
Re: linux and eva 5000
there is a change going on with multipath and linux. The older distros use "qlogic failover", but this relies on "/proc/scsi/scsi/qla2xxx/*".
This directory is no longer present in say RHEL4u4 or SLES10. The way to go seems to be Linux very own "dm-multipath" (see attached HP pdf)
HTH
Dan
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тАО06-26-2007 02:23 AM
тАО06-26-2007 02:23 AM
Re: linux and eva 5000
At this point if we reboot the system then it fails to see the luns that did fail over. At boot time only port1 is used to scan the luns and port 2 is inactive. So it errors out on the luns that failed over to port2. Once the system comes up since both paths are there when i do fdisk i can see all the devices.
The workaround was after i tried a fail over, say i pull out port1 and then restored it (at this point some luns are using port 1 and some on port2), then if i remove port 2 so that everything failed back to port1 and then i reboot then all the luns are scanned correctly.
Is there any setting that needs to be changed on the card itself. My /etc/hp_qla2x00.conf looks like this by default
qdepth = 16
port_down_retry_count = 30
login_retry_count = 30
failover = 1
load_balancing = 1
auto_restore = 0x80
If you have it working what drivers and kernel are you using and does san surfer see 4 paths to the eva? Does the failover behave the same way as above?
As for the dm-multipath the document says not to use it in a production environment??
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тАО06-26-2007 08:29 AM
тАО06-26-2007 08:29 AM
SolutionIf you only see 4 paths, something is wrong. Maybe a zoning error or an error on the EVA port or the Linux driver could not properly talk to the EVA.
You need to choose "Linux" for the Host OS and, if I remember correctly, select Path-A or "Path-B failover only" on the virtual disk presentation tab.
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тАО06-30-2007 06:30 AM
тАО06-30-2007 06:30 AM
Re: linux and eva 5000
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тАО06-30-2007 06:33 AM
тАО06-30-2007 06:33 AM