Ana Paula wrote:
Hi,
I am using linux 2.6.8 for my research on raid systems.
I need to have the disks of an array out of sync for a while.
I want to be able to stop a disk request queue (blk_stop_queue) and
start it sometime later. Meanwhile its mirrors should be serving r/w
as if this mirror was up.
Whenever the stopped mirror comes back it will serve all the requests
already sent to it.
I am queueing up the requests sent to all others while my mirror queue
is stopped.
The problem is that the other mirrors stop serving as well. Even if I
don't stop the queue, only delay its request a little bit, still the
others also slow down.
Question: how do I get raid to allow mirrors to be out of sync?
Obviously, I am missing something out in the code.
Any clues?
Take a look at "write-mostly" and see if creative use of it will assist.
I suspect you're doing something which needs a bitmap, as well.
--
Bill Davidsen <davidsen@xxxxxxx>
"Woe unto the statesman who makes war without a reason that will still
be valid when the war is over..." Otto von Bismark
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