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Linux kernel mirror (for testing)
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kernel
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linux
dm-thin: update the documentation
1. convert KB/MB/GB to KiB/MiB/GiB;
2. change the number of sectors for 128MiB from 256000 to 262144 as
256000 sectors is neither 128 MB nor 128 MiB.
Signed-off-by: LongPing Wei <weilongping@oppo.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
authored by
LongPing Wei
and committed by
Mikulas Patocka
9576e1ae
8d05316d
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Documentation/admin-guide/device-mapper/thin-provisioning.rst
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Documentation/admin-guide/device-mapper/thin-provisioning.rst
···
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As a guide, we suggest you calculate the number of bytes to use in the
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metadata device as 48 * $data_dev_size / $data_block_size but round it up
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to 2MB if the answer is smaller. If you're creating large numbers of
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to 2MiB if the answer is smaller. If you're creating large numbers of
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snapshots which are recording large amounts of change, you may find you
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need to increase this.
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The largest size supported is 16GB: If the device is larger,
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The largest size supported is 16GiB: If the device is larger,
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a warning will be issued and the excess space will not be used.
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Reloading a pool table
···
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$data_block_size gives the smallest unit of disk space that can be
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allocated at a time expressed in units of 512-byte sectors.
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$data_block_size must be between 128 (64KB) and 2097152 (1GB) and a
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multiple of 128 (64KB). $data_block_size cannot be changed after the
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$data_block_size must be between 128 (64KiB) and 2097152 (1GiB) and a
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multiple of 128 (64KiB). $data_block_size cannot be changed after the
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thin-pool is created. People primarily interested in thin provisioning
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may want to use a value such as 1024 (512KB). People doing lots of
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snapshotting may want a smaller value such as 128 (64KB). If you are
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may want to use a value such as 1024 (512KiB). People doing lots of
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snapshotting may want a smaller value such as 128 (64KiB). If you are
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not zeroing newly-allocated data, a larger $data_block_size in the
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region of 256000 (128MB) is suggested.
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region of 262144 (128MiB) is suggested.
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$low_water_mark is expressed in blocks of size $data_block_size. If
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free space on the data device drops below this level then a dm event
···
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error_if_no_space:
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Error IOs, instead of queueing, if no space.
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Data block size must be between 64KB (128 sectors) and 1GB
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Data block size must be between 64KiB (128 sectors) and 1GiB
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(2097152 sectors) inclusive.
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