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-rw-r--r--sbin/recoverdisk/recoverdisk.120
1 files changed, 18 insertions, 2 deletions
diff --git a/sbin/recoverdisk/recoverdisk.1 b/sbin/recoverdisk/recoverdisk.1
index 9eff8f7..044b801 100644
--- a/sbin/recoverdisk/recoverdisk.1
+++ b/sbin/recoverdisk/recoverdisk.1
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd May 1, 2011
+.Dd Jan 5, 2012
.Dt RECOVERDISK 1
.Os
.Sh NAME
@@ -124,7 +124,11 @@ recoverdisk -b 0 /dev/ad3 /somewhere
.Ed
.Sh SEE ALSO
-.Xr dd 1
+.Xr dd 1 ,
+.Xr ada 4,
+.Xr cam 4,
+.Xr cd 4,
+.Xr da 4
.Sh HISTORY
The
.Nm
@@ -149,6 +153,18 @@ flying by.
This is harmless and can be avoided by setting
.Fl b
to no more than 128kB.
+.Pp
+.Nm
+needs to know about read errors as fast as possible, i.e. retries by lower
+layers will usually slow down the operation.
+When using
+.Xr cam 4
+attached drives, you may want to set kern.cam.XX.retry_count to zero, e.g.:
+.Bd -literal
+# sysctl kern.cam.ada.retry_count=0
+# sysctl kern.cam.cd.retry_count=0
+# sysctl kern.cam.da.retry_count=0
+.Ed
.\".Pp
.\"When reading from optical media, a bug in the GEOM framework will
.\"prevent it from seeing that the media has been removed.
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