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Operating Systems AIX Filesystem using Oracle and mirroring VG ? Post 302710969 by funksen on Friday 5th of October 2012 07:20:04 AM
Old 10-05-2012
Bakunin is right, this depends on many things
large sequential ios would suffer less from a mirrored disk than a lot of small random ios

you didn't even say what kind of storage it is, local scsi, iscsi, san attached
I'll give you a short answer, because I'm short in time today

if your system is important enough to mirror the volume groups for data safety and to prevent a downtime due to a storage outage, then go for it


I do it this way:
cluster: mirror rootvg, mirror datavgs (mostly over two locations)
non cluster system that boots from san: no mirror at all
non cluster system that boots from local hdisk: mirror rootvg

if I would be using iscsi disks, I would mirror some of the more critical non cluster systems as well, but that's because our ip network is not as stable as our san
Quote:
Originally Posted by filosophizer
. If it indicates high I/O then after mirroring it would be even higher ? right ?
no, you must take a look at increased latency, and decreased overall data throughput in bytes/second

Last edited by funksen; 10-05-2012 at 08:25 AM..
 

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

NAME
volrootmir - Mirror areas necessary for booting to a new disk SYNOPSIS
/usr/sbin/volrootmir [-a] [nconfig=count] target_disk [swap=target_partition] OPTIONS
Specifies that all volumes on the system disk be mirrored, not just the root and swap volumes, rootvol and swapvol. DESCRIPTION
The volrootmir script causes a mirror copy of areas of the root disk involved in booting to be made on the specified target disk. When used without the -a option, volrootmir adds mirrors of the root and swap volumes and allocates them on the new disk. In addition, all disk regions required for booting are set up and partitions for the new volume mirrors are created. When used with the -a option, volrootmir mirrors all in-use partitions on the system disk. To mirror a swap volume that is on a separate disk from the root volume, the swap attribute must be used to specify a separate target for the swap mirror. The target disk(s) must be at least as large as the sum of the sizes of rootvol and swapvol. Also, the physical disk should not have any disk partition in use. This script can be called from the voldiskadm menus by choosing the Mirror volumes on a disk operation. ATTRIBUTES
Specifies the number of log copies and copies of the configuration database, for example, nconfig=2. Specifies that the swap volume, swapvol, be mirrored on a separate disk, as specified by target_partition. EXAMPLES
The following command mirrors the rootvol and swapvol volumes onto the target disk, dsk3. This command will fail if swapvol is on a differ- ent disk from rootvol. # volrootmir dsk3 The following command mirrors rootvol, swapvol, and any other volumes on the root disk onto the target disk, dsk3. This command will fail if swapvol is on a different disk from rootvol. # volrootmir -a dsk3 The following command mirrors rootvol on disk dsk3, swapvol onto partition dsk7d, and any other volumes on the root disk onto disk dsk3. This command will fail if swapvol is on the same disk as rootvol. # volrootmir -a dsk3 swap=dsk7d The following command mirrors rootvol onto disk dsk3 and swapvol onto partition dsk7d. This command will fail if swapvol is on the same disk as rootvol. # volrootmir dsk3 swap=dsk7d SEE ALSO
volintro(8), voldiskadm(8) volrootmir(8)
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