On Mon, 18 Feb 2013 12:51:40 +0100 Marcin Tomczak <marcin.tomczak@xxxxxxxxx> wrote: > In exceptional cases user can use NO_IMSM_PLATFORM flag to use IMSM > metadata RAIDs without valid Intel platform. With this flag set > mdadm does not perform any compatibility checks. > > Note: Usage of this flag may lead to data loss! > > Signed-off-by: Marcin Tomczak <marcin.tomczak@xxxxxxxxx> > --- > mdadm.8.in | 19 +++++++++++++++++++ > 1 files changed, 19 insertions(+), 0 deletions(-) > > diff --git a/mdadm.8.in b/mdadm.8.in > index 535cc39..3ef20c7 100644 > --- a/mdadm.8.in > +++ b/mdadm.8.in > @@ -2714,6 +2714,25 @@ to '1', the > .I mdadm > will create and devices that are needed. > > +.TP > +.B IMSM_NO_PLATFORM > +ATTENTION! Usage of this flag is extremely dangerous! You should use > +this flag only when you know what you are doing and when it is > +necessary. Make a backup before any action. You use it on your own > +responsibility - unpredictable effects may appear much later. I'm sorry, but I'm not going to include that sort of hyperbole in the man page. A simple statement of what it does is sufficient. I have applied this patch. NeilBrown From 401f095c39b732b4247bd728cb493eb7bb692298 Mon Sep 17 00:00:00 2001 From: NeilBrown <neilb@xxxxxxx> Date: Mon, 4 Mar 2013 17:25:36 +1100 Subject: [PATCH] mdadm.8: Detail use for IMSM_NO_PLATFORM environment variable. Suggested-by: Marcin Tomczak <marcin.tomczak@xxxxxxxxx> diff --git a/mdadm.8.in b/mdadm.8.in index a3abc2d..1c06533 100644 --- a/mdadm.8.in +++ b/mdadm.8.in @@ -2710,6 +2710,21 @@ to '1', the .I mdadm will create and devices that are needed. +.TP +.B IMSM_NO_PLATFORM +A key value of IMSM metadata is that it allows interoperability with +boot ROMs on Intel platforms, and with other major operating systems. +Consequently, +.I mdadm +will only allow an IMSM array to be created or modified if detects +that it is running on an Intel platform which supports IMSM, and +supports the particular configuration of IMSM that is being requested +(some functionality requires newer OROM support). + +These checks can be suppressed by setting IMSM_NO_PLATFORM=1 in the +environment. This can be useful for testing or for disaster +recovery. You should be aware that interoperability may be +compromised by setting this value. .SH EXAMPLES .B " mdadm \-\-query /dev/name-of-device"
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