diff --git a/share/man/man4/ccd.4 b/share/man/man4/ccd.4 index 3c2a36fd0fcf..f393922405fe 100644 --- a/share/man/man4/ccd.4 +++ b/share/man/man4/ccd.4 @@ -1,4 +1,4 @@ -.\" $NetBSD: ccd.4,v 1.12 1998/02/22 06:53:10 enami Exp $ +.\" $NetBSD: ccd.4,v 1.13 1998/02/22 07:16:07 enami Exp $ .\" .\" Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. .\" All rights reserved. @@ -90,7 +90,7 @@ partitions of the disks be combined. Each component partition should be offset at least one cylinder from the beginning of the component disk. This avoids potential conflicts between the component disk's disklabel and the -.Nm ccd Ns 's +.Nm Ns 's disklabel. The kernel will only allow component partitions of type .Dv FS_BSDFFS . .Pp @@ -101,15 +101,15 @@ pseudo-device ccd 4 # concatenated disk devices .Ed .Pp The count argument is how many -.Nm ccd Ns s +.Nm Ns s memory is allocated for at boot time. In this example, no more than 4 -.Nm ccd Ns s +.Nm Ns s may be configured. .Pp A -.Nm ccd +.Nm may be either serially concatenated or interleaved. If a -.Nm ccd +.Nm is interleaved correctly, a .Dq striping effect is achieved, which can increase performance. The optimum interleave @@ -128,10 +128,10 @@ geometry and size. Optimum striping cannot occur with different disk types. .Pp The -.Nm ccd +.Nm also supports primitive data mirroring. To enable this mirroring support, the -.Nm ccd +.Nm must be configured with the .Dv CCDF_MIRROR flag set. Note that the @@ -142,20 +142,20 @@ flag and requires an interleaved even number of components. .Pp Mirroring functions by making the second n/2 components exact duplicates of the first n/2. For example, in a mirrored -.Nm ccd +.Nm with components sd0g, sd1g, sd2g, and sd3g, sd2g would mirror sd0g and sd3g would mirror sd1g. Reads will come from the first n/2 components (in this example: sd0g and sd1g) while writes will go to all components. .Pp If a component of a mirrored -.Nm ccd +.Nm should fail, the -.Nm ccd +.Nm can be reconfigured as a non-mirrored -.Nm ccd +.Nm until the failed component can be replaced. For example, using the hypothetical -.Nm ccd +.Nm above, the recovery process might look like this: .Bd -literal -offset indent * Component sd1g fails. Reconfigure ccd without mirroring @@ -167,13 +167,13 @@ above, the recovery process might look like this: .Ed .Pp There is a run-time utility that is used for configuring -.Nm ccd Ns s. +.Nm Ns s. See .Xr ccdconfig 8 for more information. .Sh WARNINGS If just one (or more) of the disks in a non-mirrored -.Nm ccd +.Nm fails, the entire file system will be lost. .Sh FILES