diff options
Diffstat (limited to 'man/man7/zpoolconcepts.7')
| -rw-r--r-- | man/man7/zpoolconcepts.7 | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/man/man7/zpoolconcepts.7 b/man/man7/zpoolconcepts.7 index c181ea3b8..4ef96b157 100644 --- a/man/man7/zpoolconcepts.7 +++ b/man/man7/zpoolconcepts.7 @@ -91,7 +91,7 @@ vdev type is an alias for .Pp A raidz group with .Em N No disks of size Em X No with Em P No parity disks can hold approximately -.Em (N-P)*X No bytes and can withstand Em P No devices failing without losing data. +.Em (N-P)*X No bytes and can withstand Em P No devices failing without losing data . The minimum number of devices in a raidz group is one more than the number of parity disks. The recommended number is between 3 and 9 to help increase performance. @@ -99,7 +99,7 @@ The recommended number is between 3 and 9 to help increase performance. A variant of raidz that provides integrated distributed hot spares which allows for faster resilvering while retaining the benefits of raidz. A dRAID vdev is constructed from multiple internal raidz groups, each with -.Em D No data devices and Em P No parity devices. +.Em D No data devices and Em P No parity devices . These groups are distributed over all of the children in order to fully utilize the available disk performance. .Pp @@ -119,7 +119,7 @@ recommended to also add a mirrored vdev to store those blocks. .Pp In regards to I/O, performance is similar to raidz since for any read all -.Em D No data disks must be accessed. +.Em D No data disks must be accessed . Delivered random IOPS can be reasonably approximated as .Sy floor((N-S)/(D+P))*single_drive_IOPS . .Pp @@ -136,7 +136,7 @@ vdev type is an alias for .Sy draid1 . .Pp A dRAID with -.Em N No disks of size Em X , D No data disks per redundancy group, Em P +.Em N No disks of size Em X , D No data disks per redundancy group , Em P .No parity level, and Em S No distributed hot spares can hold approximately .Em (N-S)*(D/(D+P))*X No bytes and can withstand Em P devices failing without losing data. @@ -151,7 +151,7 @@ The parity level (1-3). .It Ar data The number of data devices per redundancy group. In general, a smaller value of -.Em D No will increase IOPS, improve the compression ratio, +.Em D No will increase IOPS, improve the compression ratio , and speed up resilvering at the expense of total usable capacity. Defaults to .Em 8 , No unless Em N-P-S No is less than Em 8 . |