diff options
Diffstat (limited to 'sbin/geom/class/raid3/graid3.8')
| -rw-r--r-- | sbin/geom/class/raid3/graid3.8 | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/sbin/geom/class/raid3/graid3.8 b/sbin/geom/class/raid3/graid3.8 index f38732d..713f979 100644 --- a/sbin/geom/class/raid3/graid3.8 +++ b/sbin/geom/class/raid3/graid3.8 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd Aug 18, 2004 +.Dd Aug 20, 2004 .Dt GRAID3 8 .Os .Sh NAME @@ -33,7 +33,7 @@ .Sh SYNOPSIS .Nm .Cm label -.Op Fl hnv +.Op Fl hnrv .Ar name .Ar prov .Ar prov @@ -46,7 +46,7 @@ .Op Ar prov Op Ar ... .Nm .Cm configure -.Op Fl adhnv +.Op Fl adhnrRv .Ar name .Nm .Cm rebuild @@ -106,6 +106,12 @@ Additional options include: Hardcode providers' names in metadata. .It Fl n Turn off autosynchronization of stale components. +.It Fl r +Use parity component for reading in round-robin fashion. +Without this option parity component is not used at all for reading operations +when device is in complete state. +With this option specified random I/O read operations are even 40% faster, +but sequential reads are slower. .El .It Cm clear Clear metadata on the given providers. @@ -122,6 +128,10 @@ Do not hardcode providers' names in metadata. Hardcode providers' names in metadata. .It Fl n Turn off autosynchronization of stale components. +.It Fl r +Turn on round-robin reading. +.It Fl R +Turn off round-robin reading. .El .It Cm rebuild Rebuild the given component forcibly. @@ -167,10 +177,10 @@ Additional options include: Be more verbose. .El .Sh EXAMPLES -Use 3 disks to setup a RAID3 array. Create a file system, mount it, then unmount -it and stop device: +Use 3 disks to setup a RAID3 array (use round-robin reading feature). +Create a file system, mount it, then unmount it and stop device: .Bd -literal -offset indent -graid3 label -v data da0 da1 da2 +graid3 label -v -r data da0 da1 da2 newfs /dev/raid3/data mount /dev/raid3/data /mnt [...] |
