Rsync quite slow (using very little cpu): how to improve its speed? Post: 303018316

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LEARN ABOUT NETBSD

bioctl

BIOCTL(8)						    BSD System Manager's Manual 						 BIOCTL(8)

NAME

     bioctl -- RAID management interface

SYNOPSIS

     bioctl device command [arg [...]]

DESCRIPTION

     RAID device drivers which support management functionality can register their services with the bio(4) driver.  bioctl then can be used to
     manage the RAID controller's properties.

COMMANDS

     The following commands are supported:

     show [disks | volumes]
			 Without any argument by default bioctl will show information about all volumes and the logical disks used on them.  If
			 disks is specified, only information about physical disks will be shown.  If volumes is specified, only information about
			 the volumes will be shown.

     alarm [disable | enable | silence | test]
			 Control the RAID card's alarm functionality, if supported.  By default if no argument is specified, its current state
			 will be shown.  Optionally the disable, enable, silence, or test arguments may be specified to enable, disable, silence,
			 or test the RAID card's alarm.

     blink start channel:target.lun | stop channel:target.lun
			 Instruct the device at channel:target.lun to start or cease blinking, if there's ses(4) support in the enclosure.

     hotspare add channel:target.lun | remove channel:target.lun
			 Create or remove a hot-spare drive at location channel:target.lun.

     passthru add DISKID channel:target.lun | remove channel:target.lun
			 Create or remove a pass-through device.  The DISKID argument specifies the disk that will be used for the new device, and
			 it will be created at the location channel:target.lun.  NOTE: Removing a pass-through device that has a mounted filesys-
			 tem will lead to undefined behaviour.

     check start VOLID | stop VOLID
			 Start or stop consistency volume check in the volume with index VOLID.  NOTE: Not many RAID controllers support this fea-
			 ture.

     create volume VOLID DISKIDs [SIZE] STRIPE RAID_LEVEL channel:target.lun
			 Create a volume at index VOLID.  The DISKIDs argument will specify the first and last disk, i.e.: 0-3 will use the disks
			 0, 1, 2, and 3.  The SIZE argument is optional and may be specified if not all available disk space is wanted (also
			 dependent of the RAID_LEVEL).	The volume will have a stripe size defined in the STRIPE argument and it will be located
			 at channel:target.lun.

     remove volume VOLID channel:target.lun
			 Remove a volume at index VOLID and located at channel:target.lun.  NOTE: Removing a RAID volume that has a mounted
			 filesystem will lead to undefined behaviour.

EXAMPLES

     The following command, executed from the command line, shows the status of the volumes and its logical disks on the RAID controller:

     $ bioctl arcmsr0 show
     Volume Status	 Size	      Device/Label   RAID Level Stripe
     =================================================================
	  0 Building	 468G  sd0 ARC-1210-VOL#00	 RAID 6  128KB	0% done
	0:0 Online	 234G	      0:0.0 noencl <WDC WD2500YS-01SHB1 20.06C06>
	0:1 Online	 234G	      0:1.0 noencl <WDC WD2500YS-01SHB1 20.06C06>
	0:2 Online	 234G	      0:2.0 noencl <WDC WD2500YS-01SHB1 20.06C06>
	0:3 Online	 234G	      0:3.0 noencl <WDC WD2500YS-01SHB1 20.06C06>

     To create a RAID 5 volume on the SCSI 0:15.0 location on the disks 0, 1, 2, and 3, with stripe size of 64Kb on the first volume ID, using all
     available free space on the disks:

	   $ bioctl arcmsr0 create volume 0 0-3 64 5 0:15.0

     To remove the volume 0 previously created at the SCSI 0:15.0 location:

	   $ bioctl arcmsr0 remove volume 0 0:15.0

SEE ALSO

     arcmsr(4), bio(4), cac(4), ciss(4), mfi(4)

HISTORY

     The bioctl command first appeared in OpenBSD 3.8, it was rewritten for NetBSD 5.0.

AUTHORS

     The bioctl interface was written by Marco Peereboom <marco@openbsd.org> and was rewritten with multiple features by
     Juan Romero Pardines <xtraeme@NetBSD.org>.

BSD
								  March 16, 2008							       BSD