Re: How to create 2Gb chunks on 9Gb disks?

Allocate the new disk to a logical volume group called, say, ifx. Use lvcreate -l 500 ifx to create four 2GByte logical volumes. ln -s /dev/vgifx/rlvol1 chunk1 . . ln -s /dev/vgifx/rlvol4 chunk4 As simple as that! Neil Truby Londis Stores Hampton Hill, UK Willem Huson wrote in message <36bff708$0$16487@newton>... >This question has probably come up in the past, but I could not find it >anymore in the newsgroup. >We will migrate our databases from a system with 2Gb disks to one with 9Gb >disks under HP-UX 10.2x. >We used to link our chunks to 2Gb raw devices, but now we have to devide the >disks in 2Gb parts with the logical volume manager. Is there any convention >on how this is achieved? Does anyone have a nice "cookbook" on how to link >chunks to logical volumes? >All suggestions and references are welcome. > >Willem Huson > >

When you go to allocate these new chunks to dbspaces in Informix, make sure the allocation is done *across* the disks and not *down* the disks. Informix allocates page cleaners in chunk# order. Allocating across the disks gives you parallelism and better performance. HTH Allen On Tue, 9 Feb 1999 09:47:58 -0000, "Neil Truby" <ntruby@netcomuk.co.uk> wrote: >Allocate the new disk to a logical volume group called, say, ifx. >Use lvcreate -l 500 ifx to create four 2GByte logical volumes. >ln -s /dev/vgifx/rlvol1 chunk1 >. >. >ln -s /dev/vgifx/rlvol4 chunk4 > >As simple as that! > >Neil Truby > >Willem Huson wrote in message <36bff708$0$16487@newton>... >>We will migrate our databases from a system with 2Gb disks to one with 9Gb >>disks under HP-UX 10.2x. >>We used to link our chunks to 2Gb raw devices, but now we have to devide >the >>disks in 2Gb parts with the logical volume manager. I