topic Re: Total Device File ? in Operating System - HP-UX

Total Device File ?

Javier Ortiz Guajardo — Fri, 06 Aug 2004 14:27:56 GMT

i have a disk array and i want to add mode LUNS (disk) , my last device file is /dev/dsk/c42t15d7, i mean, all the device files are assigned, can i add more disks(LUNS) what happen with the device files?

thanks?

Re: Total Device File ?

John Poff — Fri, 06 Aug 2004 14:29:56 GMT

Hi,

I guess it depends on the disk array. We used to use some big EMC arrays, and when we reached that limit on a single controller EMC would asssign the next lun with the controller number incremented: c43t0d0.

JP

Re: Total Device File ?

Javier Ortiz Guajardo — Fri, 06 Aug 2004 14:35:40 GMT

John, if i understand, you mean i must installa new disk controller card to my disk array?

Re: Total Device File ?

Sundar_7 — Fri, 06 Aug 2004 15:14:11 GMT

You can map the LUN to a different target/LUN/vbus combination and assign them to a differen controller.

I do believe there is a limitation on the number of disks seen by a controller in HP-Ux.

Refer the attached whitepaper - a very useful doc in understanding the LUN management in HP-Ux

Re: Total Device File ?

Javier Ortiz Guajardo — Fri, 06 Aug 2004 18:43:14 GMT

i have a v2250 with HPUX 11.0 and i want to know how many LUNS per disk controller card can the system assign.?

Thanks