Does Tru64 provide the soft raid function?

[ericfjchen]

As title

[Venkatesh BL]

Do you mean software RAID?...that is what LSM (Logical Storage Manager) of Tru64 provides.

[Ivan Ferreira]

Yes, you can use LSM.

See the Logical Storage Manager Documentation. Part Number: AA-RH9BD-TE


Also, see volintro and volassist man pages.

[Michael Schulte zur Sur]

Hi,

you will need an extra license for that product.

greetings,

Michael

[Raj D.]

Hi ericfjchen ,

True64 provide LSM (Logical Storage Manager), and it supports UFS , AdvFS ..

It supports RAID 0 , 1 , 0+1 , and RAID 5.

Check this out for a good understanding :

http://h18000.www1.hp.com/products/quickspecs/12278_div/12278_div.html

Cheers ,
Raj.

[ericfjchen]

LSM is not default boundle on Tru64? Do we need another license for it?

[Nguyen Anh Tien]

If you take Full Installation that will
provides the following features:
· Choice of a graphical or text interface
· Dynamic disk partitioning
· Worldwide Language Support (WLS) software installation
· Logical Storage Manager (LSM) configuration option
· Automatic resolution of software dependencies during custom software
selection
· Ability to invoke user-supplied files prior to installation and after software
subset loading to customize the installation process
· Identification of physical disks
· UNIX shell option

[Venkatesh BL]

It is bundled with the Base OS kit. But, you require license to use it.

[Han Pilmeyer]

The LSM license is not required for all features of LSM. At least it is required for things like dxlsm and mirroring (probably any type of RAID).

[Michael Schulte zur Sur]

Han,

using LSM without some form of RAID is like having a car without transmission ;-). Only a source for trouble but no use.

Michael

[Han Pilmeyer]

In the days when LSM was first introduced disks were less than 1 GB in size. In those days LSM could be used to create file systems and raw volumes that spanned multiple disks. That was certainly useful at the time.

[Michael Schulte zur Sur]

Han,

you are right! That makes sense.

Michael

[Hein van den Heuvel]

Eric,

What problem are you trying to solve?

Hardware controllers are very capable raid-5 managers. Why bother the OS with that menial task? Why turn a single system IO into 4 (read data, read checksum, write data, write checksum).

Now if you are talking raid-1, more commonly referred to as mirroring, then that is a whole different problem nicely solved with LSM plexes. There software/OS level raid-1 give the big advantage of potentially using multiple distint, redundant, paths.

hth,
Hein.