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Disk mirroring/duplexing

Posted on 1997-05-02
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Last Modified: 2013-12-16
I would appreciate any "how to" advice on setting up disk
mirroring and duplexing to achieve RAID Levels 1 OR 2 in the
Solaris and sunOS environment.
Thanks in advance for your expert advice.

Denmark
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Question by:denmark
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pxh earned 200 total points
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You need a software, which is called Solstice DiskSuite (for Solaris). There is something equivalent for SunOS (I will supply you with the name later in a comment).

As far as the Solaris S/W is concerned it is not a big deal to setup a mirror. There is even a graphical user interface for it, called MetaTool. Another possibility is manually modify a config file (usually /etc/opt/SUNWmd/md.tab). By the way, "md" stands for metadisk. Here is an example to mirror /usr :

/dev/md/dsk/d12 1 1     /dev/dsk/c0t0d0s6
/dev/md/dsk/d2  -m      /dev/md/dsk/d12
/dev/md/dsk/d22 1 1     /dev/dsk/c0t1d0s6

This creates a partition /dev/md/dsk/d2, consisting of two submirrors (d12 and d22) from the s6 slots of two different disks.

There must be an entry in /etc/vstab to mount /dev/md/dsk/d2 to /usr.

There are also some command essential command lines to make this work.

I have followed the recipe in the manual and had no probs. Also / and the swap partition are mirror on my server in a similar way. For those system partition I  have created the entries by hand. FOr the configuration of striped and mirrored user or data partions I used the rather comfortable metatool application.

I think I will not go into more detail as long as I don't know whether you ever get that software.

RAID level 2 is not supported in the mentioned S/W. However there is striping and RAID level 5.

Hope this info is helpful for you, let me know if you have further questions,

Peter (pxh@mpe-garching.mpg.de)

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