b=5498

[fs/lustre-release.git] / lustre / doc / lctl.8

diff --git a/lustre/doc/lctl.8 b/lustre/doc/lctl.8
index e56331a..9243863 100644 (file)
--- a/lustre/doc/lctl.8
+++ b/lustre/doc/lctl.8
@@ -106,6 +106,18 @@ communication with the failed OST.
 .BI abort_recovery 
 Abort the recovery process on a restarting MDT or OST device
 .PP
+.SS Virtual Block Device Operation
+Lustre is able to emulate a virtual block device upon regular file. It is necessary to be used when you are trying to setup a swap space via file.
+.TP
+.BI blockdev_attach " <file name> <device node>"
+Attach the lustre regular file to a block device. If the device node is not existent, lctl will create it \- it is recommended to create it by lctl since the emulator uses a dynamical major number.
+.TP
+.BI blockdev_detach " <device node>"
+Detach the virtual block device.
+.TP
+.BI blockdev_info " <device node>"
+Acquire which lustre file was attached to the device node.
+.PP
 .SS Debug
 .TP 
 .BI debug_daemon