Document the new --write-zeroes option in the manpage. Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx> --- mdadm.8.in | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/mdadm.8.in b/mdadm.8.in index 70c79d1e6e76..3beb475fd955 100644 --- a/mdadm.8.in +++ b/mdadm.8.in @@ -837,6 +837,22 @@ array is resynced at creation. From Linux version 3.0, .B \-\-assume\-clean can be used with that command to avoid the automatic resync. +.TP +.BR \-\-write-zeroes +When creating an array, send write zeroes requests to all the block +devices. This should zero the data area on all disks such that the +initial sync is not necessary and, if successfull, will behave +as if +.B \-\-assume\-clean +was specified. +.IP +This is intended for use with devices that have hardware offload for +zeroing, but despit this zeroing can still take several minutes for +large disks. Thus a message is printed before and after zeroing and +each disk is zeroed in parallel with the others. +.IP +This is only meaningful with --create. + .TP .BR \-\-backup\-file= This is needed when -- 2.30.2
