Solaris

Hello Admins..

I am going through solaris volume manager guide for RAID-0 concatenation and stripes, I do not understand the concept of stripe from following example of concatenation.

There is an eample for concatenation:


# metainit d25 1 1 c0t1d0s2
d25: Concat/Stripe is setup


the explanation given is:
"This example shows the creation of a concatenation, d25, that consists of one stripe (the first number 1) made of a single slice (the second number 1 in front of the slice). The system verifies that the volume has been set up."

As far as I understand, stripe volume is access of data parallely across slices.
but from above example of concatenation, how does that number 1 comes in as stripe?

Please clear my confusion.

Thanks

Well, it can't be a mirror as at least two devices are required to create one and it can't be a raid5 as then at least three devices are required so it must be a stripe, although very minimal indeed.

Hii snchaudhari2,

I can clear your doubt:

1.)The volume which u have created is a concat/stripe volume bcoz ur using one disk only,
so der is no diff of concat or stripe.

2.)Difference comes when u will have two disks like:

Let me clear it with example,

U have two disks
c0t1d0s2
c0t1d0s4

Concatenation:
#metainit -f d1 2 1 c0t1d0s2 1 c0t1d0s4
It will create a concatenated volume d1,in which first c0t1d0s2 disk will full
and then c0t1d0s4 will full.


Striping:
#metainit -f d1 1 2 c0t1d0s2 c0t1d0s4

It will create a striped volume d1,in which data will transfer parallel to both disks.

I think this clears urs doubts ........

hi CJ007,

yeah it did cleared most of the doubt, but can you just tell me the meaning of the numbers used in the syntax i.e. 2, 1 ,1 ?

Sometimes the number 2 will be referred as concatenation of 2 stripes (as per your example), thats makes me confuse.

Please suggest

Check "Examples" section in the metainit man page: metainit(1M) (man pages section 1M: System Administration Commands)

Hi snchaudhari2,

2 1 1 means concatenation of 2 disk in which 1 is c0t1d0s2 and 1 is c0t1d0s4.

For striping ,
You always have to specify 1 after the volume name and then no of stripes you want to give.In my example i have given 2 stripes.

#metainit -f d1 1 2 c0t1d0s2 c0t1d0s4