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 Relinking 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.
You can use the onspaces utility to take down a chunk. The following example takes down a chunk that is part of the dbspace db_acct:
onspaces -s db_acct -p /dev/mirror_chk1 -o 0 -D
To use ON–Monitor to take down a mirror chunk, choose the Dbspaces > Status option. With the cursor on the dbspace that contains the chunk that you want to take down, press F3 or CTRL-B. The database server displays a screen that lists all the chunks in the dbspace. Move the cursor to the chunk that you want to take down and press F3 or CTRL-B to change the status (take it down).
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