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Full Discussion: RAID 0+1 Vs RAID 1+0
Operating Systems Solaris RAID 0+1 Vs RAID 1+0 Post 302257338 by Annihilannic on Wednesday 12th of November 2008 01:06:29 AM
Old 11-12-2008
There's not a huge difference really. What software are you using to perform this mirroring?

To make use of either RAID0+1 or 1+0 you'll need at least 4 disks, do you have that many?

Basically RAID0+1 means that you concatenate two disks first (i.e. RAID0), and then you mirror the two RAID0 volumes (i.e. RAID1).

RAID1+0 is the reverse, i.e. you mirror two pairs of disks, and then you concatenate the two resulting volumes.

The RAID1+0 has some advantages in that if you lose one disk, you only invalidate half of one of the mirrors, so less time is required to resynchronise the data when the disk is replaced. It also means that you can lose one disk on one side, and another disk on the other side without any loss of service.

With RAID0+1, if you lose either disk in one of the concatenated volumes, you lose that whole side until the disk is replaced... which means that if you lose either of the two disks on the other side you have lost your entire volume. Multiple disk failures aren't very common, but they can happen.

So RAID1+0 has slightly better redundancy than RAID0+1. The performance and space efficiency of both is identical.
 

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

NAME
volreattach - Reattaches disk drives that have once again become accessible SYNOPSIS
/usr/sbin/volreattach [-rb] [accessname...] /usr/sbin/volreattach -c accessname OPTIONS
The volreattach utility has the following options: Calls the volrecover utility to attempt to recover stale plexes of any volumes on the failed disk. Performs the reattach operation in the background. Checks whether a reattach is possible. No operation is performed, but the name of the disk group and disk media name at which the disk can be reattached is displayed. DESCRIPTION
The volreattach utility attempts to reattach disks using the same disk group and media names they had before detachment. This operation may be necessary if a disk has a transient failure, or if some disk drivers are unloaded or unloadable when the Logical Storage Manager is started, causing disks to enter the failed state. If the problem is fixed, the volreattach command can be used to reattach the disks without plexes being flagged as stale, as long as the reattach happens before any volumes on the disk are started. The volreattach command is called from the voldiskadm menus as part of disk recovery. The volreattach utility tries to find a disk with a disk group and disk ID matching that of the disk(s) being reattached. If the matching disk is found, the reattach operation may still fail if the original cause (or some other cause) for the disk failure still exists. EXIT CODES
A zero exit status is returned if it is possible to perform a reattach. Otherwise, non-zero is returned. SEE ALSO
volintro(8), voldiskadm(8), volrecover(8) volreattach(8)
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