blk_limits_max_hw_sectors(9) [centos man page]

BLK_LIMITS_MAX_HW_SE(9) 					   Block Devices					   BLK_LIMITS_MAX_HW_SE(9)

NAME

       blk_limits_max_hw_sectors - set hard and soft limit of max sectors for request

SYNOPSIS

       void blk_limits_max_hw_sectors(struct queue_limits * limits, unsigned int max_hw_sectors);

ARGUMENTS

       limits
	   the queue limits

       max_hw_sectors
	   max hardware sectors in the usual 512b unit

DESCRIPTION

       Enables a low level driver to set a hard upper limit, max_hw_sectors, on the size of requests. max_hw_sectors is set by the device driver
       based upon the combined capabilities of I/O controller and storage device.

       max_sectors is a soft limit imposed by the block layer for filesystem type requests. This value can be overridden on a per-device basis in
       /sys/block/<device>/queue/max_sectors_kb. The soft limit can not exceed max_hw_sectors.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   BLK_LIMITS_MAX_HW_SE(9)

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

NAME

       chfsets - Changes limits for fileset quotas

SYNOPSIS

       /sbin/chfsets [-F limit] [-f limit] [-B limit] [-b limit] domain [fileset...]

OPTIONS

       Specifies  the  file  usage  soft limit (quota) of the fileset.	Specifies the file usage hard limit (quota) of the fileset.  Specifies the
       block usage soft limit (quota) in 1K blocks of the fileset.  Specifies the block usage hard limit (quota) in 1K blocks of the fileset.

OPERANDS

       Specifies the name of the file domain.  Specifies the name of one or more filesets.

DESCRIPTION

       The chfsets command enables you to change fileset quotas (file usage limits and block usage limits) of any AdvFS fileset.

       Filesets can have both soft and hard disk storage and file limits.  When a hard limit is reached, no more disk space  allocations  or  file
       creations  which  would	exceed	the limit are allowed.	The soft limit may be exceeded for a period of time (called the grace period). The
       grace periods for the soft limits are set with the edquota command.

       The command also displays the changes made to the file and block usage limits.

       Note that the root user can exceed fileset quotas.

       The chfsets command displays the following fileset information: Id

	      A unique number (in hexadecimal format) that identifies a file domain and fileset.  File H limit

	      The file usage hard limit of the specified fileset before the change followed by the new limit.  Block H limit

	      The block usage hard limit of the specified fileset before the change followed by the new limit.	File S limit

	      The file usage soft limit of the specified fileset before the change followed by the new limit.  Block S limit

	      The block usage soft limit of the specified fileset before the change followed by the new limit.

       Use the following commands to manipulate filesets: Displays the limits and actual number of blocks used by a fileset.  Displays space usage
       for the specified domain.  Displays the file and block usage limits for the filesets in a domain.  Changes the user or group block and file
       limits and grace period.  Turns on and off quota enforcement.

       For more information, see the reference pages for each command.

RESTRICTIONS

       At least one fileset within the domain must be mounted for the chfsets command to succeed.

       You must be the root user to run the chfsets command.

EXAMPLES

       The following example changes the file hard limit from 11 to 200 and block hard limit from 121 to 1000 for the  credit_fs  fileset  in  the
       account_dmn domain: # chfsets -b 1000 -f 200 account_dmn credit_fs

	     credit_fs
		    Id		  :  2c2f557f.000b15f4.3.8004
		    File H limit  :  11 --> 200
		    Block H limit :  121 --> 1000

EXIT STATUS

       The utility returns a 0 (zero) on success and a 1 (one) on failure.

SEE ALSO

       Commands:  df(1), edquota(8), quotaon(8), quotaoff(8), showfdmn(8), showfsets(8)

																	chfsets(8)