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тАО06-24-2009 10:01 AM
тАО06-24-2009 10:01 AM
Solved! Go to Solution.
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тАО06-24-2009 10:20 AM
тАО06-24-2009 10:20 AM
SolutionThe rx2660 server has a hardware raid card.
This permits the hardware to present the system with one hardware raid configured disk.
You boot into this configuration and can see it with a web server that ships with PSP for HP-UX.
I am almost sure this is not a problem. My guess is you have your six disks configured as a gigantic raid 5 disk.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО06-24-2009 10:30 AM
тАО06-24-2009 10:30 AM
Re: why only 1 SAS Disk displayed of 6 disks
How big is this logical volue?
Use the /opt/raidsa/bin/saconfig utility to get detailed information about the raid controller and its disks.
/opt/raidsa/bin/saconfig /dev/sasd0
If your raid controller device is other than sasd0, use that instead. Look at a full ioscan listing for the sas device.
It is possible that you have an upgraded controller with a single huge LUN for all six disks because with the default raid controller on the rx2660, you are limited to one or two mirrored pairs and a host spare. All other SAS disks would be visible to the OS as simple disks.
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тАО06-24-2009 10:45 AM
тАО06-24-2009 10:45 AM
Re: why only 1 SAS Disk displayed of 6 disks
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тАО06-24-2009 11:34 AM
тАО06-24-2009 11:34 AM
Re: why only 1 SAS Disk displayed of 6 disks
First lets be sure this is what we are dealing with.
ioscan -fnC disk
See how many disks you see. I think you will see one.
Then to change this, you will have to change the system hardware raid configuration.
This will if its a gigantic raid 5 or raid 10 volume leave you with an unbootable system. You will after changing the RAID configuration have to re-install the OS.
I with six disks would do the following:
1 Raid 1 volume via hardware to be boot disk.
The other 4 disks in a second hardware raid volume. If you plan to host a write intensive database, this I would also do as raid 1. If its less write intensive, the second volume would be raid 5.
Why hardware raid? The raid card has its own CPU and its better to handle the i/o there than with the OS. Better performance, easier disk replacement.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО06-24-2009 11:36 AM
тАО06-24-2009 11:36 AM
Re: why only 1 SAS Disk displayed of 6 disks
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тАО06-24-2009 04:39 PM
тАО06-24-2009 04:39 PM
Re: why only 1 SAS Disk displayed of 6 disks
Yes, you're right. When I run ioscan -fnC disk, I only see one disk, and the description is "logical volume".
I also say thank you to TTr for your explanation. Yes, I manage to keep one mirrored pair for the OS boot disk.
Guys, please write down the detai steps required for this implementation. Many thanks.
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тАО06-24-2009 08:29 PM
тАО06-24-2009 08:29 PM
Re: why only 1 SAS Disk displayed of 6 disks
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тАО06-24-2009 09:37 PM
тАО06-24-2009 09:37 PM
Re: why only 1 SAS Disk displayed of 6 disks
Post
# ioscan -fn
to confirm.
Hope this helps!
Regards
Torsten.
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тАО06-24-2009 09:52 PM
тАО06-24-2009 09:52 PM
Re: why only 1 SAS Disk displayed of 6 disks
Check the following thread, it will work for you, if it does, please assign points:
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1335662
Rgds-Kranti