Hi there,

My task is to replace the two 73 G disks with two 143 G disks , which has vxvm 4.1 running on it. I would like to know whether the steps iam following are correct.
1. Break the sub-disks, plexes of the root mirror.
2. Remove the sub-disks,plexes of the root mirror.
3. Remove one of the hard disk(eg. c0t1d0) and replace new.
4. Initialize the new disk and create subdisks and plexes
5. Attach the subdisks and plexes to the existing volumes
6. once there's no task in vxtask, do the same for the primary root disk(c0t0d0) also.

i would like to know whether i need to de-encapsulate the root disk before i do this.and also do i need to perform these in single-user mode? and also do i need to export the disk-group before i do these?

Please correct me if iam wrong.

Any help would be greatly appreciated.

The answer depends somewhat on the reason for replacing the disks, are you going to change the sizes of encapsulated filesystems or do you want to add new partitions or something else, you may or may not need to de-encasulate depending on your reply.

also as this is a rootdisk, when mirroring you MUST use vxrootmir to mirror the root filesystem or the second mirror will not boot.

Hi,

Thanks for your quick reply, actually due to size constraints i decided to replace 73G with 143G drive but i need the same data to be there in new disk and i dont need to increase the root file system, i want to create some new volumes in those new disks.

I was thinking about vxdiskadm, option to remove failed disk and replace.

Once i replace one disk at a time,it'll initialise it and can i mirror it using vxdiskadm itself?

Thanks

Ok, you have something of a messy situation to deal with here.

And just a couple of comments:
1. If you have any other diskgroups, condier using them instead.
2. If you only have 2 disk why use veritas? Encapsulated roots are a pain SVM is a whole lot simpler for boot disks.

I generally don't like to use vxdiskadm, so I'm not
sure what options you've got there.

The basics:

for each plex on the mirror:
then
remove mirror disk, and replace.
layout the new partitions on disk
for each other volume
repeat the procedure for rootdisk, no need to unencapsulate.

Hi,

Iam sorry for not quoting the details properly.

Actually I have 4 disks of which the other 2 disks belong to other diskgroup. I understand that SVM is more simpler and effecive for mirroring root disks but the company std. is like that.I cant do anything abt that.

Thanks for your step by step procedure. I'll try these steps.

Thanks.