Take down a mirror chunk

When a mirror chunk is down, the database server cannot write to it or read from it. You might take down a mirror chunk to relink the chunk to a different device. (See Relink a chunk to a device after a disk failure.)

Taking down a chunk is not the same as ending mirroring. You end mirroring for a complete dbspace, which causes the database server to drop all the mirror chunks for that dbspace.

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