29 lines
1.2 KiB
Diff
29 lines
1.2 KiB
Diff
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--- util-linux-2.12a/disk-utils/raw.8.dd 2006-04-24 15:27:39.000000000 +0200
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+++ util-linux-2.12a/disk-utils/raw.8 2006-04-24 15:53:46.000000000 +0200
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@@ -15,6 +15,12 @@
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.PP
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.B raw
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.B \-qa
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+.SH WARNING
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+Although Linux includes support for rawio, it is now a deprecated interface. If
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+your application performs device access using this interface, Red Hat
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+encourages you to modify your application to open the block device with the
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+O_DIRECT flag. The rawio interface will exist for the life of Red Hat
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+Enterprise Linux 4, but is a candidate for removal from future releases.
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.SH DESCRIPTION
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.B raw
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is used to bind a Linux raw character device to a block device. Any
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@@ -82,8 +88,10 @@
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.SH BUGS
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The Linux
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.B dd
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-(1) command does not currently align its buffers correctly, and so
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-cannot be used on raw devices.
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+(1) command should be used without bs= option or the blocksize needs to be a
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+multiple of the sector size of the device (512 bytes usually) otherwise it
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+will fail with "Invalid Argument" messages (EINVAL).
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+
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.PP
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Raw I/O devices do not maintain cache coherency with the Linux block
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device buffer cache. If you use raw I/O to overwrite data already in
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