Date: Wed, 23 Jul 2014 22:19:31 -0400 From: "Michael W. Lucas" <mwlucas@michaelwlucas.com> To: questions@freebsd.org Subject: gpart resize problem Message-ID: <20140724021931.GA25549@bewilderbeast.blackhelicopters.org>
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Hi,
I am utterly perplexed by how gpart resize behaves, and beseech you
for enlightenment. I'm running:
# uname -a
FreeBSD storm 11.0-CURRENT FreeBSD 11.0-CURRENT #6 r269010: Wed Jul 23 11:13:17 EDT 2014 mwlucas@storm:/usr/obj/usr/src/sys/GENERIC amd64
I have empty space on disk da0, right next to partition 6.
# gpart show da0
=> 40 1953525088 da0 GPT (932G)
40 1024 1 freebsd-boot (512K)
1064 984 - free - (492K)
2048 16777216 2 freebsd-swap (8.0G)
16779264 10485760 3 freebsd-ufs (5.0G)
27265024 10485760 4 freebsd-ufs (5.0G)
37750784 104857600 - free - (50G)
142608384 1810916744 6 freebsd-ufs (864G)
I want to expand partition 6.
# gpart resize -i 6 -a 4k da0
da0p6 resized
# gpart show da0
=> 40 1953525088 da0 GPT (932G)
40 1024 1 freebsd-boot (512K)
1064 984 - free - (492K)
2048 16777216 2 freebsd-swap (8.0G)
16779264 10485760 3 freebsd-ufs (5.0G)
27265024 10485760 4 freebsd-ufs (5.0G)
37750784 104857600 - free - (50G)
142608384 1810916744 6 freebsd-ufs (864G)
That's really weird. Maybe I can't expand a partition backwards?
# gpart resize -i 4 -a 4k -s 10G da0
da0p4 resized
# gpart show da0
=> 40 1953525088 da0 GPT (932G)
40 1024 1 freebsd-boot (512K)
1064 984 - free - (492K)
2048 16777216 2 freebsd-swap (8.0G)
16779264 10485760 3 freebsd-ufs (5.0G)
27265024 115343360 4 freebsd-ufs (55G)
142608384 1810916744 6 freebsd-ufs (864G)
Wait! I said 10G, not 55G!
Can I shrink this partition back down?
# gpart resize -i 4 -a 4k -s 5G da0
da0p4 resized
# gpart show da0
=> 40 1953525088 da0 GPT (932G)
40 1024 1 freebsd-boot (512K)
1064 984 - free - (492K)
2048 16777216 2 freebsd-swap (8.0G)
16779264 10485760 3 freebsd-ufs (5.0G)
27265024 10485760 4 freebsd-ufs (5.0G)
37750784 104857600 - free - (50G)
142608384 1810916744 6 freebsd-ufs (864G)
Yes, I can make it return to 5G.
Trying to make da0p4 grow by only a few GB makes the partition pop up
to 55GB. I can then shrink it to the desired size with a second
change.
Am I totally misunderstanding "gpart resize"?
Thanks,
==ml
--
Michael W. Lucas - mwlucas@michaelwlucas.com, Twitter @mwlauthor
http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/
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