Re: RAID5 question

From: JOSEPH KREMBLAS (JKREMBLAS_at_REDHEARTGIFTS.COM)
Date: 03/29/05

  • Next message: Mark Schlechte: "Re: SSA vs SCSI - general IO troubleshooting" 
    Date:         Tue, 29 Mar 2005 11:58:51 -0700
To: aix-l@Princeton.EDU

    Another way would be to issue the "lspv -l <hdiskX>" command against
    every pdisk/hdisk to see where the LVs are.

    -----Original Message-----
    From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of
    Vipin Khushu-Suse
    Sent: Tuesday, March 29, 2005 11:40 AM
    To: aix-l@Princeton.EDU
    Subject: Fw: RAID5 question

    Try

    lslv -m 'logical volume name'

    and see if that produces desired results.

    I do not have RAID5 in my environment.....

    ----- Original Message -----
    From: "Leyden, Joseph" <LeydenJ@METRO.NET>
    Newsgroups: bit.listserv.aix-l
    To: <aix-l@Princeton.EDU>
    Sent: Tuesday, March 29, 2005 12:44 PM
    Subject: Re: RAID5 question

    > IN a RAID 5 configuration,
    > lslv -l 'logical volume name' - shows only the one big hdisk array.
    > This array has 5 hdisks. I need to know exactly where it puts it so my

    > read/write contention with other files can be improved if relocated on

    > other drives. Can this be done on a RAID 5 architecture?
    >
    >
    > Joe
    >
    > -----Original Message-----
    > From: Vipin Khushu-Suse [mailto:vkhushu@GUERNSEYOP.COM]
    > Sent: Monday, March 28, 2005 8:41 AM
    > To: aix-l@Princeton.EDU
    > Subject: Fw: RAID5 question
    >
    >
    > RAID5 does overcome the limitations of RAID2,3,4 by distributing
    > parity information over all disks rather than just one.
    >
    > You can allocate 5 log vol / physical vol as long as you don't violate

    > the max # of total physical partitions / physical volume rule as
    > applicable in your environment.
    >
    > To determine which hdisk a given log vol resides:
    >
    > lslv -l hd6
    >
    > where hd6 is a log vol.
    >
    >
    >
    > ----- Original Message -----
    > From: "Leyden, Joseph" <LeydenJ@METRO.NET>
    > Newsgroups: bit.listserv.aix-l
    > To: <aix-l@Princeton.EDU>
    > Sent: Monday, March 28, 2005 11:10 AM
    > Subject: Re: RAID5 question
    >
    >
    > > Now that I've got RAID5 with 5 hdisks into a
    > > single big hdisk array.
    > >
    > > Can I allocate 5 logical volumes on each physical
    > > hadisk .... OR
    > >
    > > How do I find out on which physical disk (hdisk)
    > > a certain volume reside when allocated.
    > >
    > >
    > > Joe (new to RAID5, installed it because boss thinks
    > > it's the latest and greatest).
    > >
    >

  • Next message: Mark Schlechte: "Re: SSA vs SCSI - general IO troubleshooting"

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