diff options
Diffstat (limited to 'Documentation/admin-guide/blockdev/zoned_loop.rst')
| -rw-r--r-- | Documentation/admin-guide/blockdev/zoned_loop.rst | 61 |
1 files changed, 37 insertions, 24 deletions
diff --git a/Documentation/admin-guide/blockdev/zoned_loop.rst b/Documentation/admin-guide/blockdev/zoned_loop.rst index 64dcfde7450a..806adde664db 100644 --- a/Documentation/admin-guide/blockdev/zoned_loop.rst +++ b/Documentation/admin-guide/blockdev/zoned_loop.rst @@ -68,30 +68,43 @@ The options available for the add command can be listed by reading the In more details, the options that can be used with the "add" command are as follows. -================ =========================================================== -id Device number (the X in /dev/zloopX). - Default: automatically assigned. -capacity_mb Device total capacity in MiB. This is always rounded up to - the nearest higher multiple of the zone size. - Default: 16384 MiB (16 GiB). -zone_size_mb Device zone size in MiB. Default: 256 MiB. -zone_capacity_mb Device zone capacity (must always be equal to or lower than - the zone size. Default: zone size. -conv_zones Total number of conventioanl zones starting from sector 0. - Default: 8. -base_dir Path to the base directory where to create the directory - containing the zone files of the device. - Default=/var/local/zloop. - The device directory containing the zone files is always - named with the device ID. E.g. the default zone file - directory for /dev/zloop0 is /var/local/zloop/0. -nr_queues Number of I/O queues of the zoned block device. This value is - always capped by the number of online CPUs - Default: 1 -queue_depth Maximum I/O queue depth per I/O queue. - Default: 64 -buffered_io Do buffered IOs instead of direct IOs (default: false) -================ =========================================================== +=================== ========================================================= +id Device number (the X in /dev/zloopX). + Default: automatically assigned. +capacity_mb Device total capacity in MiB. This is always rounded up + to the nearest higher multiple of the zone size. + Default: 16384 MiB (16 GiB). +zone_size_mb Device zone size in MiB. Default: 256 MiB. +zone_capacity_mb Device zone capacity (must always be equal to or lower + than the zone size. Default: zone size. +conv_zones Total number of conventioanl zones starting from + sector 0 + Default: 8 +base_dir Path to the base directory where to create the directory + containing the zone files of the device. + Default=/var/local/zloop. + The device directory containing the zone files is always + named with the device ID. E.g. the default zone file + directory for /dev/zloop0 is /var/local/zloop/0. +nr_queues Number of I/O queues of the zoned block device. This + value is always capped by the number of online CPUs + Default: 1 +queue_depth Maximum I/O queue depth per I/O queue. + Default: 64 +buffered_io Do buffered IOs instead of direct IOs (default: false) +zone_append Enable or disable a zloop device native zone append + support. + Default: 1 (enabled). + If native zone append support is disabled, the block layer + will emulate this operation using regular write + operations. +ordered_zone_append Enable zloop mitigation of zone append reordering. + Default: disabled. + This is useful for testing file systems file data mapping + (extents), as when enabled, this can significantly reduce + the number of data extents needed to for a file data + mapping. +=================== ========================================================= 3) Deleting a Zoned Device -------------------------- |