1BLOCKDEV(8)                 System Manager's Manual                BLOCKDEV(8)
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NAME

6       blockdev - call block device ioctls from the command line
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SYNOPSIS

9       blockdev [options] commands devices
10       blockdev --report [devices]
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DESCRIPTION

13       The  utility  blockdev  allows one to call block device ioctls from the
14       command line.
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OPTIONS

17       -V     Print version and exit.
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19       -q     Be quiet.
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21       -v     Be verbose.
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23       --report
24              Print a report for devices.  Note that the partition StartSec is
25              in 512-byte sectors.
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COMMANDS

28       --setro
29              Set read-only.
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31       --setrw
32              Set read-write.
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34       --getro
35              Get read-only. Print 1 if the device is read-only, 0 otherwise.
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37       --getss
38              Print sectorsize in bytes - usually 512.
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40       --getbsz
41              Print blocksize in bytes.
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43       --setbsz N
44              Set blocksize to N bytes.
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46       --getsize
47              Print  device  size in sectors (BLKGETSIZE). Deprecated in favor
48              of the --getsz option.
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50       --getsize64
51              Print device size in bytes (BLKGETSIZE64)
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53       --getsz
54              Get size in 512-byte sectors (BLKGETSIZE64 / 512).
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56       --setra N
57              Set readahead to N 512-byte sectors.
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59       --getra
60              Print readahead (in 512-byte sectors).
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62       --setfra N
63              Set filesystem readahead (same like --setra on 2.6 kernels).
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65       --getfra
66              Get filesystem readahead.
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68       --flushbufs
69              Flush buffers.
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71       --rereadpt
72              Reread partition table.
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AUTHOR

75       blockdev was written by Andries E. Brouwer.
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AVAILABILITY

78       The blockdev command is part of the util-linux-ng package and is avail‐
79       able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
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84                                   Jun 2007                        BLOCKDEV(8)
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