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  • 3 replies
  • Latest Post - ‏2011-03-07T15:35:26Z by Brian_King
khfagan
khfagan
4 Posts

Pinned topic Is booting off the RAID DASD Backplane supported on with RHEL V5.5 Power710

‏2011-03-03T21:05:27Z |
Can anyone help with the following question?

Our customer is interested in an 8231-E2B, Power 710 system with the Red Hat Linux V5.5 Operating System. They also want to use Hardware RAID 10 to protect the six disk drives in the system, including the Operating System. For this reason I have configured feature code 5268, DASD/Media Backplane -- 6 SFF DASD/SATA DVD/RAID/External SAS Port, which says it allows RAID 10. Feature code 5268 is listed as supported with Red Hat Linux in the Power 710 Salesmanual. This is the only way to achieve hardware RAID in the Power 710.

The problem is, when we read the Red Hat Linux V5 Installation manual at:
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/Installation_Guide/Red_Hat_Enterprise_Linux-5-Installation_Guide-en-US.pdf

we find the following warning on page 132:

“Warning : If you have a RAID card, be aware that Red Hat Enterprise Linux 5 does not support setting up hardware RAID on an IPR card. If you already have the RAID array setup, Open Firmware does not support booting from the RAID card. In cases such as these, the /boot/ partition must be created on a partition outside of the RAID array, such as on a separate hard drive.”
So, the question is, Can the Power 710 system boot off the Red Hat Linux, Version 5.5 Operating System if it is installed in a Hardware RAID 10 Array through the feature code 5268, RAID DASD/Media Backplane?
The e-configurator allows it, but the Red Hat Linux installation manual seems to indicate it can’t be done when the RHEL OS is protected through a RAID card. Thanks, in advance for any assistance you can provide
Updated on 2011-03-07T15:35:26Z at 2011-03-07T15:35:26Z by Brian_King
  • Brian_King
    Brian_King
    20 Posts

    Re: Is booting off the RAID DASD Backplane supported on with RHEL V5.5 Power710

    ‏2011-03-03T21:23:14Z  
    Red Hat Enterprise Linux will indeed boot from a hardware RAID array on Power. Prior to installing Linux, boot the standalone diagnostics CD and use the raid manager to create your RAID array. Then boot the Red Hat installer and install as usual. Linux and OpenFirmware see the RAID array just like any other disk.
  • khfagan
    khfagan
    4 Posts

    Re: Is booting off the RAID DASD Backplane supported on with RHEL V5.5 Power710

    ‏2011-03-04T14:14:31Z  
    Red Hat Enterprise Linux will indeed boot from a hardware RAID array on Power. Prior to installing Linux, boot the standalone diagnostics CD and use the raid manager to create your RAID array. Then boot the Red Hat installer and install as usual. Linux and OpenFirmware see the RAID array just like any other disk.
    Brian, Thanks for your assistance. That's good information. It's good to hear that booting RHEL V5.5 on an IBM Power System is possible through the RAID DASD Backplane. Any idea, though, why the Red Hat Installation Guide includes the following warning?

    “Warning : If you have a RAID card, be aware that Red Hat Enterprise Linux 5 does not support setting up hardware RAID on an IPR card. If you already have the RAID array setup, Open Firmware does not support booting from the RAID card. In cases such as these, the /boot/ partition must be created on a partition outside of the RAID array, such as on a separate hard drive.”

    Why would they print that? Any ideas? Is the RHEL Operating System itself allowed to be within a RAID 10 Array? Is this warning only applicable to non-Power systems? Thanks for any advice you can offer.
  • Brian_King
    Brian_King
    20 Posts

    Re: Is booting off the RAID DASD Backplane supported on with RHEL V5.5 Power710

    ‏2011-03-07T15:35:26Z  
    • khfagan
    • ‏2011-03-04T14:14:31Z
    Brian, Thanks for your assistance. That's good information. It's good to hear that booting RHEL V5.5 on an IBM Power System is possible through the RAID DASD Backplane. Any idea, though, why the Red Hat Installation Guide includes the following warning?

    “Warning : If you have a RAID card, be aware that Red Hat Enterprise Linux 5 does not support setting up hardware RAID on an IPR card. If you already have the RAID array setup, Open Firmware does not support booting from the RAID card. In cases such as these, the /boot/ partition must be created on a partition outside of the RAID array, such as on a separate hard drive.”

    Why would they print that? Any ideas? Is the RHEL Operating System itself allowed to be within a RAID 10 Array? Is this warning only applicable to non-Power systems? Thanks for any advice you can offer.
    The RHEL OS itself is indeed allowed to be within a RAID 10 array. I've engaged with Red Hat to get this documentation fixed up.