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-rw-r--r--mdadm.85
1 files changed, 3 insertions, 2 deletions
diff --git a/mdadm.8 b/mdadm.8
index 4ec2f76a..57918bfb 100644
--- a/mdadm.8
+++ b/mdadm.8
@@ -447,11 +447,12 @@ slash ('/') if it is a real file (not 'internal' or 'none').
Note: external bitmaps are only known to work on ext2 and ext3.
Storing bitmap files on other filesystems may result in serious problems.
-
.TP
.BR --bitmap-chunk=
Set the chunksize of the bitmap. Each bit corresponds to that many
-Kilobytes of storage. Default is 4 when using a file based bitmap.
+Kilobytes of storage.
+When using a file based bitmap, the default is to use the smallest
+size that is atleast 4 and requires no more than 2^21 chunks.
When using an
.B internal
bitmap, the chunksize is automatically determined to make best use of