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From: Dimitry Andric <dimitry@andric.com>
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To: Harald Schmalzbauer <h.schmalzbauer@omnilan.de>
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Cc: freebsd-current@freebsd.org, Ivan Voras <ivoras@freebsd.org>
Subject: Re: gmirror provider name limit [Was: Re: geom_label: gpt/labelname
 for gmirror provider?]
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On 2009-07-16 09:43, Harald Schmalzbauer wrote:
> I found that the name of the provider for gmirror mustn't exceed 15 
> characters. `gmirror` doesn't complain if you specify a provider name 
> longer that 15 characters, but the mirror won't be detected.
> So for example it's impossible to use gptid as provider.
> At least this should be documented in the man page(es, I guess this 
> restriction applies to graid3 etc. also)

As far as I can see, this limit applies to gconcat, gjournal, gmirror,
graid3, gshsec and gstripe:

sys/geom/concat/g_concat.h:96:	char		md_provider[16]; /* Hardcoded provider. */
sys/geom/journal/g_journal.h:292:	char		md_provider[16]; /* Hardcoded provider. */
sys/geom/mirror/g_mirror.h:250:	char		md_provider[16]; /* Hardcoded provider. */
sys/geom/raid3/g_raid3.h:281:	char		md_provider[16]; /* Hardcoded provider. */
sys/geom/shsec/g_shsec.h:88:	char		md_provider[16]; /* Hardcoded provider. */
sys/geom/stripe/g_stripe.h:91:	char		md_provider[16]; /* Hardcoded provider. */