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mdadm: document some more magic environment variables. 

Others are mostly for developers.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2014-08-14 14:54:05 +10:00
parent b47024f1c5
commit f66585eb08
1 changed files with 26 additions and 0 deletions
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26
mdadm.8.in
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@ -2886,6 +2886,20 @@ to '1', the
.I mdadm .I mdadm
will create and devices that are needed. will create and devices that are needed.
.TP
.B MDADM_NO_SYSTEMCTL
If
.I mdadm
detects that
.I systemd
is in use it will normally request
.I systemd
to start various background tasks (particularly
.IR mdmon )
rather than forking and running them in the background. This can be
suppressed by setting
.BR MDADM_NO_SYSTEMCTL=1 .
.TP .TP
.B IMSM_NO_PLATFORM .B IMSM_NO_PLATFORM
A key value of IMSM metadata is that it allows interoperability with A key value of IMSM metadata is that it allows interoperability with
@ -2902,6 +2916,18 @@ environment. This can be useful for testing or for disaster
recovery. You should be aware that interoperability may be recovery. You should be aware that interoperability may be
compromised by setting this value. compromised by setting this value.
.TP
.B MDADM_GROW_ALLOW_OLD
If an array is stopped while it is performing a reshape and that
reshape was making use of a backup file, then when the array is
re-assembled
.I mdadm
will sometimes complain that the backup file is too old. If this
happens and you are certain it is the right backup file, you can
over-ride this check by setting
.B MDADM_GROW_ALLOW_OLD=1
in the environment.
.TP .TP
.B MDADM_CONF_AUTO .B MDADM_CONF_AUTO
Any string given in this variable is added to the start of the Any string given in this variable is added to the start of the