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mdadm/SOURCES/0105-manpage-Add-write-zero...

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From 33831d845a48b9a2ac4d1e954c88a3dd8cb15753 Mon Sep 17 00:00:00 2001
From: Logan Gunthorpe <logang@deltatee.com>
Date: Wed, 1 Mar 2023 13:41:35 -0700
Subject: [PATCH 105/125] 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>
---
mdadm.8.in | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/mdadm.8.in b/mdadm.8.in
index 64f71ed1..6f0f6c13 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 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
@@ -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
--
2.38.1