diff options
Diffstat (limited to 'Documentation/block/queue-sysfs.txt')
| -rw-r--r-- | Documentation/block/queue-sysfs.txt | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt index 3eaf86806621..f6da2efe2105 100644 --- a/Documentation/block/queue-sysfs.txt +++ b/Documentation/block/queue-sysfs.txt @@ -14,6 +14,15 @@ add_random (RW) This file allows to turn off the disk entropy contribution. Default value of this file is '1'(on). +chunk_sectors (RO) +------------------ +This has different meaning depending on the type of the block device. +For a RAID device (dm-raid), chunk_sectors indicates the size in 512B sectors +of the RAID volume stripe segment. For a zoned block device, either host-aware +or host-managed, chunk_sectors indicates the size in 512B sectors of the zones +of the device, with the eventual exception of the last zone of the device which +may be smaller. + dax (RO) -------- This file indicates whether the device supports Direct Access (DAX), @@ -132,6 +141,12 @@ per-block-cgroup request pool. IOW, if there are N block cgroups, each request queue may have up to N request pools, each independently regulated by nr_requests. +nr_zones (RO) +------------- +For zoned block devices (zoned attribute indicating "host-managed" or +"host-aware"), this indicates the total number of zones of the device. +This is always 0 for regular block devices. + optimal_io_size (RO) -------------------- This is the optimal IO size reported by the device. @@ -213,19 +228,4 @@ devices are described in the ZBC (Zoned Block Commands) and ZAC do not support zone commands, they will be treated as regular block devices and zoned will report "none". -nr_zones (RO) -------------- -For zoned block devices (zoned attribute indicating "host-managed" or -"host-aware"), this indicates the total number of zones of the device. -This is always 0 for regular block devices. - -chunk_sectors (RO) ------------------- -This has different meaning depending on the type of the block device. -For a RAID device (dm-raid), chunk_sectors indicates the size in 512B sectors -of the RAID volume stripe segment. For a zoned block device, either host-aware -or host-managed, chunk_sectors indicates the size in 512B sectors of the zones -of the device, with the eventual exception of the last zone of the device which -may be smaller. - Jens Axboe <jens.axboe@oracle.com>, February 2009 |