UNIX Software shadowing and mirroring

[Mohamed K Ahmed]

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

[Nicolas Dumeige]

Define software shadowing ?

[Mohamed K Ahmed]

shadowing = mirroring

software, like use an application to mirror disks

[Hein van den Heuvel]

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]

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]

Michael,

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

Mohamed

[Michael Schulte zur Sur]

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