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Full Discussion: how to mirror raid5
Operating Systems AIX how to mirror raid5 Post 302163759 by bakunin on Saturday 2nd of February 2008 08:51:58 AM
Old 02-02-2008
Quote:
Originally Posted by itik
Is this going to have data integrity problem considering SAN is much faster than SSA? And my system is only 4.3.3 with JFS only.
Use the "mirror write consistency" option if you want to be 101% sure, but: no, there are no problems with data integrity because of unequal disk speeds.

Quote:
When detaching the SSA disk, the command is reducevg hdisk14. Is that correct?
yes, that is correct. After that use "rmdev -dl <disk>" to remove the disk device prior to physically detaching it.

Quote:
And there's no conflict for all types of disks whether raid 0,1,5 to be mirrored.
No, there is not. When the disk is used by the LVM it is turned into a "physical volume" and this is raw storage space, regardless of where it comes from. This is the main difference between a "disk" and a "physical volume": it doesn't matter any more of which the physical volume is constructed.

Hope this helps.

bakunin
 

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LEARN ABOUT REDHAT

vgremove

VGREMOVE(8)						      System Manager's Manual						       VGREMOVE(8)

NAME

       vgremove - remove a volume group

SYNOPSIS

       vgremove [-d|--debug] [-h|--help] [-v|--verbose] VolumeGroupName [VolumeGroupName...]

DESCRIPTION

       vgremove  allows you to remove one or more volume groups.  The volume group(s) must not have any logical volumes allocated and must also be
       inactive (see vgchange(8) ).

   OPTIONS
       -d, --debug
	      Enables additional debugging output (if compiled with DEBUG).

       -h, --help
	      Print a usage message on standard output and exit successfully.

       -v, --verbose
	      Gives verbose runtime information about vgremove's activities.

DIAGNOSTICS

       vgremove returns an code code of 0 for success and > 0 for error:

       1  no volume group name on command line
       2  error setting up freed physical volume
       3  error writing freed physical volume(s) to disk(s)
       4  error removing volume group from lvmtab
       5  can't remove volume group containing logical volumes
       6  invalid volume group name
       7  volume group is active
       8  not all physical volumes are online
       9  error accessing volume group
       10 error reading volume group data from disk(s)

       95 driver/module not in kernel
       96 invalid I/O protocol version
       97 error locking logical volume manager
       98 invalid lvmtab (run vgscan(8))
       99 invalid command line

See also
       lvm(8), vgcreate(8), vgreduce(8)

AUTHOR

       Heinz Mauelshagen <Linux-LVM@Sistina.com>

Heinz Mauelshagen						     LVM TOOLS							       VGREMOVE(8)
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