Take the 2-minute tour ×
Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems.. It's 100% free, no registration required.

When I run powercf -q on my Solaris machine, what changes does this command do on the EMC storage, or on Solaris file system?

From manual page:

 DESCRIPTION
 During system boot on Solaris  hosts,  the  powercf  utility
 configures  PowerPath  devices by scanning the HBAs for both
 single-ported and multiported storage  system  logical  dev-
 ices.  (A multiported logical device shows up on two or more
 HBAs with the same storage system subsystem/device identity.
 The  identity  comes  from the serial number for the logical
 device.) For each storage system logical device found in the
 scan  of  the HBAs, powercf creates a corresponding emcpower
 device entry in the emcp.conf file, and it saves  a  primary
 path and an alternate primary path to that device.
share|improve this question
1  
That man page explains it pretty well. What don't you understand in it? –  Mat Sep 21 '12 at 4:06

1 Answer 1

up vote 2 down vote accepted

It doesn't make any changes on the EMC storage. It only scans the fibre channel bus to see what world-wide names are visible through each local port. If it sees the same WWN through multiple ports, then it sets that storage device up for multipath I/O.

Changes are made to emcp.conf in /kernel/drv, and those changes in turn effect how device paths are created under /devices and/or /dev.

If you're on a Solaris system with a zfs root, you can install fresh, snapshot the system, then install PowerPath, run powercf -q, and do a zfs diff rpool/ROOT/solaris@snapshot rpool/ROOT/solaris to see exactly what changed in your root filesystem.

If you don't have zfs root, you could always install a system, let it sit for 30 minutes, then run powercf -q, then use find / -mmin -30 to find files younger than 30 minutes.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.