[XFS] How to use real-time subvolume Post: 302398349

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Top Forums UNIX for Advanced & Expert Users [XFS] How to use real-time subvolume Post 302398349 by Corona688 on Wednesday 24th of February 2010 10:16:21 AM

02-24-2010

Registered User

From man 5 xfs:

Code:

       The realtime section is used to  store  the  data  of  realtime  files.
       These  files had an attribute bit set through xfsctl(3) after file cre-
       ation, before any data was written to the file.  The  realtime  section
       is  divided  into  a  number  of  extents  of  fixed size (specified at
       mkfs.xfs(8) time).  Each file in the realtime  section  has  an  extent
       size that is a multiple of the realtime section extent size.

xfsctl is a C function call.

Last edited by Corona688; 02-24-2010 at 12:02 PM..

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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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