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author | Logan Gunthorpe <logang@deltatee.com> | 2023-03-01 13:41:33 -0700 |
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committer | Jes Sorensen <jes@trained-monkey.org> | 2023-03-13 10:08:10 -0400 |
commit | 577fd10486d8d1472a6b559066f344ac30a3a391 (patch) | |
tree | 9e51a7f670c3288138d38a06c588a4d8a4e0a98d /ReadMe.c | |
parent | 9364dbfb264e89ab9467dfc0d2b813033e320640 (diff) | |
download | mdadm-577fd10486d8d1472a6b559066f344ac30a3a391.tar.gz |
mdadm: Add --write-zeros option for Create
Add the --write-zeros option for Create which will send a write zeros
request to all the disks before assembling the array. After zeroing
the array, the disks will be in a known clean state and the initial
sync may be skipped.
Writing zeroes is best used when there is a hardware offload method
to zero the data. But even still, zeroing can take several minutes on
a large device. Because of this, all disks are zeroed in parallel using
their own forked process and a message is printed to the user. The main
process will proceed only after all the zeroing processes have completed
successfully.
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>
Diffstat (limited to 'ReadMe.c')
-rw-r--r-- | ReadMe.c | 2 |
1 files changed, 2 insertions, 0 deletions
@@ -138,6 +138,7 @@ struct option long_options[] = { {"size", 1, 0, 'z'}, {"auto", 1, 0, Auto}, /* also for --assemble */ {"assume-clean",0,0, AssumeClean }, + {"write-zeroes",0,0, WriteZeroes }, {"metadata", 1, 0, 'e'}, /* superblock format */ {"bitmap", 1, 0, Bitmap}, {"bitmap-chunk", 1, 0, BitmapChunk}, @@ -390,6 +391,7 @@ char Help_create[] = " --write-journal= : Specify journal device for RAID-4/5/6 array\n" " --consistency-policy= : Specify the policy that determines how the array\n" " -k : maintains consistency in case of unexpected shutdown.\n" +" --write-zeroes : Write zeroes to the disks before creating. This will bypass initial sync.\n" "\n" ; |