'\" te
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.TH METAPARAM 1M "Mar 26, 2006"
.SH NAME
metaparam \- modify parameters of metadevices
.SH SYNOPSIS
.LP
.nf
\fB/usr/sbin/metaparam\fR \fB-h\fR
.fi

.LP
.nf
\fB/usr/sbin/metaparam\fR [\fB-s\fR \fIsetname\fR]
     [\fIconcat/stripe\fR \fIor\fR \fIRAID5\fR \fIoptions\fR] \fIconcat/stripe\fR \fIRAID\fR
.fi

.LP
.nf
\fB/usr/sbin/metaparam\fR [\fB-s\fR \fIsetname\fR] [\fImirror\fR \fIoptions\fR] \fImirror\fR
.fi

.SH DESCRIPTION
.sp
.LP
The \fBmetaparam\fR command is used to display or modify current parameters of
metadevices.
.sp
.LP
If just the metadevice is specified as an argument to the \fBmetaparam\fR
command, the current settings are displayed.
.sp
.LP
The \fBmetaparam\fR command enables most metadevice (volume) parameters to be
changed. Only the interlace value cannot be changed by \fBmetaparam\fR, because
it is established when the metadevice is created and cannot be changed
thereafter.
.SH OPTIONS
.sp
.LP
Root privileges are required for all of the options.
.sp
.LP
The following options are supported:
.sp
.ne 2
.na
\fB\fB-h\fR\fR
.ad
.sp .6
.RS 4n
Displays usage message.
.RE

.sp
.ne 2
.na
\fB\fB-s\fR \fB\fIsetname\fR\fR\fR
.ad
.sp .6
.RS 4n
Specify the name of the diskset on which \fBmetaparam\fR works. Using the
\fB-s\fR option causes the command to perform its administrative function
within the specified diskset. Without this option, the command performs its
function on local metadevices.
.RE

.SH CONCAT/STRIPE OR RAID5 OPTIONS
.sp
.ne 2
.na
\fB\fB-h\fR\fIhot_spare_pool\fR \fB| none\fR\fR
.ad
.sp .6
.RS 4n
Specifies the hot spare pool to be used by a metadevice. If \fBnone\fR is
specified, the metadevice is disassociated with the hot spare pool assigned to
it. If the metadevice is currently using a hot spare, then \fBmetaparam\fR
cannot replace the hot spare pool.
.RE

.sp
.ne 2
.na
\fB\fIconcat/stripe\fR \fB|\fR\fIRAID\fR\fR
.ad
.sp .6
.RS 4n
Specifies the metadevice name of the concatenation, stripe, or concatenation of
stripes, or of the RAID5 metadevice.
.RE

.SH MIRROR OPTIONS
.sp
.ne 2
.na
\fB\fB-r roundrobin | geometric | first\fR\fR
.ad
.sp .6
.RS 4n
Modifies the read option for a mirror. The \fB-r\fR option must be followed by
either \fBroundrobin\fR, \fBgeometric\fR, or \fBfirst\fR. \fBroundrobin\fR,
which is the default action under the \fBmetainit\fR command, specifies reading
the disks in a round-robin (load balancing) method. \fBgeometric\fR allows for
faster performance on sequential reads. \fBfirst\fR specifies reading only from
the first submirror.
.RE

.sp
.ne 2
.na
\fB\fB-w parallel | serial\fR\fR
.ad
.sp .6
.RS 4n
Modifies the write option for a mirror. The \fB-w\fR option must be followed by
either \fBparallel\fR or \fBserial\fR. \fBparallel\fR, the default action under
the \fBmetainit\fR command, specifies that all writes are parallel.
\fBserial\fR specifies that all writes are serial.
.RE

.sp
.ne 2
.na
\fB\fB-p\fR \fIpass_number\fR\fR
.ad
.sp .6
.RS 4n
A number from 0-to-9 that specifies the order in which a mirror is resynced
during reboot. The default is 1. Smaller pass numbers are resynced first. Equal
pass numbers are run concurrently. If 0 is used, the mirror resync is skipped.
0 should only be used for mirrors mounted as read-only, or as \fBswap\fR.
.RE

.sp
.ne 2
.na
\fB\fImirror\fR\fR
.ad
.sp .6
.RS 4n
Specifies the metadevice name of the mirror.
.RE

.SH EXAMPLES
.LP
\fBExample 1 \fRAssociating Hot Spare Pool with RAID5 Metadevice
.sp
.LP
This example associates a hot spare pool, \fBuser_pool\fR, with a RAID5
metadevice, \fBuser_raid\fR.

.sp
.in +2
.nf
# metaparam -h user_pool user_raid
.fi
.in -2
.sp

.LP
\fBExample 2 \fRChanging Read Option to Geometric
.sp
.LP
This example changes the read option on a mirror \fBd50\fR from the default of
roundrobin to geometric.

.sp
.in +2
.nf
# metaparam -r geometric d50
.fi
.in -2
.sp

.SH EXIT STATUS
.sp
.LP
The following exit values are returned:
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.sp .6
.RS 4n
Successful completion.
.RE

.sp
.ne 2
.na
\fB\fB>0\fR\fR
.ad
.sp .6
.RS 4n
An error occurred.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Stable
.TE

.SH SEE ALSO
.sp
.LP
\fBmdmonitord\fR(1M), \fBmetaclear\fR(1M), \fBmetadb\fR(1M),
\fBmetadetach\fR(1M), \fBmetahs\fR(1M), \fBmetainit\fR(1M),
\fBmetaoffline\fR(1M), \fBmetaonline\fR(1M), \fBmetarecover\fR(1M),
\fBmetarename\fR(1M), \fBmetareplace\fR(1M), \fBmetaroot\fR(1M),
\fBmetaset\fR(1M), \fBmetassist\fR(1M), \fBmetastat\fR(1M), \fBmetasync\fR(1M),
\fBmetattach\fR(1M), \fBmd.tab\fR(4), \fBmd.cf\fR(4), \fBmddb.cf\fR(4),
\fBmd.tab\fR(4), \fBattributes\fR(5), \fBmd\fR(7D)
.sp
.LP
\fI\fR