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Operating System - Tru64 Unix
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UNIX Software shadowing and mirroring

Mohamed K Ahmed
Trusted Contributor

UNIX Software shadowing and mirroring

Hi all,

Is it possible to do a software based shadowing on Tru64 UNIX
What about Software based Raiding?

I do software shadowing in OpenVMS, and I just wanted to implement the same idea on my Unix boxes.
All systems are ES40 Tru64 UNIX V 5.1 and higher, disks are connected through San switch, HSG80 controller. Right now it is on Raid 5 Controller based raiding and no shadowing (mirroring)

Thanks
6 REPLIES
Nicolas Dumeige
Esteemed Contributor

Re: UNIX Software shadowing and mirroring

Define software shadowing ?
All different, all Unix
Mohamed K Ahmed
Trusted Contributor

Re: UNIX Software shadowing and mirroring

shadowing = mirroring

software, like use an application to mirror disks
Hein van den Heuvel
Honored Contributor

Re: UNIX Software shadowing and mirroring


Yes, you can use LSM (with the right license) to use software mirroring.

Start with 'man lsmman ?!

YOu can ofcourse also just use Storage based mirror solutions transparent to Tru64.

Hein.
Michael Schulte zur Sur
Honored Contributor

Re: UNIX Software shadowing and mirroring

Hi,

do you want to use hsg80 and non hsg80 in a mirror set? If not, why not stick to hsg mirror?

greetings,

Michael
Mohamed K Ahmed
Trusted Contributor

Re: UNIX Software shadowing and mirroring

Michael,

What is better, HSG80 Mirroring ans Striping, or Software based Mirror and Striping?

Mohamed
Michael Schulte zur Sur
Honored Contributor

Re: UNIX Software shadowing and mirroring

Mohamed,

if you want to keep the data on the san/hsg80 territory than I would let the hsg80 do the job of striping/mirroring. That is my personal preference. I don't like lsm too much, though it surely has advantages, if you want to mirror to different subsystems. Do you have a dual redundant configuration? Mirroring by lsm on a hsg80 san seems a bit of a waste too me. That's why.

So, what do you think?

greetings,

Michael