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Full Discussion: How do I determine the best number to use for the bs (block size) operand of the dd command?
Top Forums UNIX for Beginners Questions & Answers How do I determine the best number to use for the bs (block size) operand of the dd command? Post 303011910 by Corona688 on Thursday 25th of January 2018 10:47:26 AM
Old 01-25-2018
What instructions are you following? It makes little sense to dump a raw ISO to a partition, flash drive is not CDROM. A few odd boot systems do this, but usually you'd install to a flash drive like a hard drive.

4M is fine. The point is that it's not left at the default of 512, which would be extremely slow.

It may seem to take a long time because it may take a long time. USB media not particularly fast. If you want to know how much it has written and are running in Linux, not some other UNIX try running sudo killall -USR1 dd which should cause dd to print statistics. (On non-Linux operating systems, killall has a more literal meaning.)
 

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LEARN ABOUT CENTOS

xfs_rtcp

xfs_rtcp(8)						      System Manager's Manual						       xfs_rtcp(8)

NAME

       xfs_rtcp - XFS realtime copy command

SYNOPSIS

       xfs_rtcp [ -e extsize ] [ -p ] source ... target
       xfs_rtcp -V

DESCRIPTION

       xfs_rtcp  copies  a  file  to the realtime partition on an XFS filesystem.  If there is more than one source and target, the final argument
       (the target) must be a directory which already exists.

OPTIONS

       -e extsize
	      Sets the extent size of the destination realtime file.

       -p     Use if the size of the source file is not an even multiple of the block size of the destination filesystem.  When  -p  is  specified
	      xfs_rtcp	will  pad  the destination file to a size which is an even multiple of the filesystem block size.  This is necessary since
	      the realtime file is created using direct I/O and the minimum I/O is the filesystem block size.

       -V     Prints the version number and exits.

SEE ALSO

       xfs(5), mkfs.xfs(8), mount(8).

CAVEATS

       Currently, realtime partitions are not supported under the Linux version of XFS, and use of a realtime partition WILL CAUSE  CORRUPTION	on
       the data partition. As such, this command is made available for curious DEVELOPERS ONLY at this point in time.

																       xfs_rtcp(8)
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