Quote:
Originally Posted by beginningDBA
Really sorry for the long posting. But i would really want to clear all the doubts.
I have 2 disk c0t0d0 & c0t1d0, i wanted to mirror c0t1d0 (mirror) to c0t0d0 (main).
Creating state database replica:
metadb -a -c3 -f c0t0d0s7
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Question:
1. Should i create the state database replica on c0t0d0s7 or c0t1d0s7?
2. Should i create all the replicas on the same slice?
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1. Create state database replicas on both disks, 2 on each would be enought.
2. Yes. But it must be unused slice.
Quote:
Originally Posted by beginningDBA
Creating volumes:
metainit -f d11 1 1 c0t0d0s1
metainit -f d12 1 1 c0t1d0s1
Creating one-way mirror:
metainit d10 -m d11
Creating two-way mirror:
metattach d10 d12
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Question:
1. Does the above command means that d11(c0t0d0s1) is two-way mirrored to d12(c0t1d0s1)?
2. Should i create mirror and volumes on all the 8 slices (s0-s7)?
3. Is it creating two-way mirror means that when i delete something on the main/mirror volume, the other volume will also do the same?
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1. It means that d10 is two-way mirror with submirrors: d11 and d12.
2. Depends what you want to do. Besides you can't mirror all slices, as 1 slice on each disk need to hold state database replicas, but remaining 7 slices can be mirrored if you require that in your setup.
3. You can't delete something from mirror, you only see main device (d10) which is going to be mounted in your system, and system will manage all operations on the submirrors. When you do any operation on d10, both submirrors receive same operation. If you would try manipulating submirrors (like mounting d11 and changing it) it would damage your data, but I guess system should be able to recover from that, anyway don't edit submirrors.
Quote:
Originally Posted by beginningDBA
This is my understanding from reading through the webs. If i get it all wrong, please kindly point out my mistake.
Thanks in advance for reading or solving the thread.
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You're welcome.
