02-22-2011
Thanks alot for your reply zxmaus,
very helpful information, much appreciated!
I think we will go ahead as planned in the classical way,
however...
someone has also explained to me the possibility of META-LUNS on this EMC disksystem:
We have 3 RAID6 arrays on the storage system.
Instead of creating 40 1 TB luns,
We could also make 1 huge lun per array,
so we would have 3 huge luns,
and then concatenate these 3 luns together into a META-LUN.
The storage system then stripes over all the disks automatically this way.
This way, one giant disk of 40 TB would be presented to AIX,
and a VG could be created, out of 1 PV.
So all the striping would be handled by the storage system itself and
there is no more parallelism in AIX then.
However,
I have never heard of anybody working like this,
and the thought of having one big 40 TB lun is pretty scary.
Does anybody have any experience with this?
I guess we could also make a combination of both:
We could also make 500 GB luns on the 3 arrays,
and concatenate each time 3 500 GB luns into 1.5 TB meta luns for example,
presenting about 26 1.5 TB disks to AIX in this way.
this way we would be using both parallellism mechanisms:
- on the AIX OS with the VG
- on the storage box with META-LUNs
I'm starting to consider the combination of both mechanisms
as described above.
Any thoughts on this?
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LEARN ABOUT HPUX
dgcfgbackup
dgcfgbackup(1M) dgcfgbackup(1M)
NAME
dgcfgbackup - create or update VxVM volume group configuration backup file
SYNOPSIS
/usr/sbin/dgcfgbackup [-f dg_conf_path ] dg_name
DESCRIPTION
The dgcfgbackup command saves the VxVM configuration for a disk group in a default or alternate configuration backup file (see the descrip-
tion of the-f option).
By default, dgcfgbackup is run automatically each time that a VxVM command changes the VxVM configuration. In this case, it always uses
the default configuration backup file. An existing default configuration backup file is renamed with an extension of .old.
Options and Arguments
dg_name Specifies the name of a disk group.
-f dg_conf_path
Saves the configuration using an alternate file name specified by dg_conf_path. If this option is omitted, the default file name
is /etc/vxvmconf/dg_name.conf.
EXIT CODES
dgcfgbackup exits with a zero status on successful completion. An non-zero exit status indicates that errors occurred when information
from the disk group was being accessed.
EXAMPLES
Back up VxVM configuration information for disk group testdg in the default backup file /etc/vxvmconf/testdg.conf:
dgcfgbackup testdg
Back up VxVM configuration information for disk group datadg in the alternate configuration backup file /tmp/datadg.backup:
dgcfgbackup -f /tmp/datadg.backup datadg
NOTES
It is recommended that any alternate configuration backup file be created in the root file system (as is the case with the default path
name). This facilitates disk group recovery during maintenance mode, such as after a system crash.
AUTHOR
dgcfgbackup was developed by the Hewlett-Packard Company.
SEE ALSO
dgcfgrestore(1M)
VxVM 5.0.31.1 24 Mar 2008 dgcfgbackup(1M)