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| author | Logan Gunthorpe <logang@deltatee.com> | 2023-03-01 21:41:35 +0100 |
|---|---|---|
| committer | Jes Sorensen <jes@trained-monkey.org> | 2023-03-13 15:08:10 +0100 |
| commit | 33831d845a48b9a2ac4d1e954c88a3dd8cb15753 (patch) | |
| tree | 00cd571f505c85d946c225252fbb4373eb23d741 | |
| parent | tests/00raid5-zero: Introduce test to exercise --write-zeros. (diff) | |
| download | mdadm-33831d845a48b9a2ac4d1e954c88a3dd8cb15753.tar.xz mdadm-33831d845a48b9a2ac4d1e954c88a3dd8cb15753.zip | |
manpage: Add --write-zeroes option to manpage
Document the new --write-zeroes option in the manpage.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Kinga Tanska <kinga.tanska@linux.intel.com>
Reviewed-by: Xiao Ni <xni@redhat.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
| -rw-r--r-- | mdadm.8.in | 18 |
1 files changed, 17 insertions, 1 deletions
@@ -838,6 +838,22 @@ array is resynced at creation. From Linux version 3.0, 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 despite 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 .B \-\-grow @@ -1370,7 +1386,7 @@ and .B layout\-alternate options are for RAID0 arrays with non-uniform devices size that were in use before Linux 5.4. If the array was being used with Linux 3.13 or -earlier, then to assemble the array on a new kernel, +earlier, then to assemble the array on a new kernel, .B \-\-update=layout\-original must be given. If the array was created and used with a kernel from Linux 3.14 to Linux 5.3, then |