From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: Creating volume in IMSM container Date: Wed, 8 Apr 2015 07:28:53 +1000 Message-ID: <20150408072853.44d0890e@notabene.brown> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; boundary="Sig_/0LwBl0ZqoB0JVHlG7jrm6OA"; protocol="application/pgp-signature" Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Ian Pilcher Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/0LwBl0ZqoB0JVHlG7jrm6OA Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Tue, 07 Apr 2015 10:29:02 -0500 Ian Pilcher wrote: > I am trying to create an IMSM container and volume in a KVM virtual > machine (so that I can create a reproducer for a Fedora problem that > seems to only/mostly affect IMSM RAID). I've managed to create a > container with the following command: >=20 > IMSM_NO_PLATFORM=3D1 mdadm --create --verbose /dev/md/imsm \ > /dev/vd{a,b} --raid-devices 2 --metadata=3Dimsm >=20 > /proc/mdstat now contains: >=20 > Personalities: [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] ... > md127 : inactive vdb[1](S) vda[0](S) > 2210 blocks super external:imsm 2210 blocks is tiny. I think each device needs at least 6306 sectors for IMSM. I suggest going for at least 20,000. >=20 > I haven't, however, been able to create a volume within the container: >=20 > # IMSM_NO_PLATFORM=3D1 mdadm --create --verbose /dev/md/vol0 \ > /dev/md/imsm --raid-devices 2 --level 1 --metadata=3Dimsm > mdmon: not enough devices with space to create array. This should work once you have devices with enough space. >=20 > # IMSM_NO_PLATFORM=3D1 mdadm --create --verbose /dev/md/vol0 \ > /dev/vd{a,b} --raid-devices 2 --level 1 --metadata=3Dimsm > mdadm: /dev/vda appears to be part of a raid array: > level=3Dcontainer devices=3D0 ctime=3DThu Jan 1 00:00:00 1970 > mdmon: /dev/vdb is not in the same imsm set > mdadm: /dev/vdb is not suitable for this array. > mdadm: create aborted >=20 This looks like a bug. What version of mdadm. NeilBrown > Am I doing something wrong, or is this simply not possible? >=20 --Sig_/0LwBl0ZqoB0JVHlG7jrm6OA Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIVAwUBVSRMFTnsnt1WYoG5AQJH8hAAlZvilAbEd+7ZGrKzeZRJQgbhoSpZl58G +BAjBwiU9aFLy6gcjmroCsRHEc3Edi2p52kyU0RkmV5mu3vv0BjBsru2JzoX7MGu YXk/gNga9ZhrAehk5noS/YetLsFST+8vLK4Hc1CCesSbPZu4biTqc9NTwFiqN1mg qqOJIMzL5coCjckJPizOuv31ZgfSwnZMdztLum6FMxJrRqb4JolqQ0vXPXDuLRRy ipLKOu2M7gSdqVgDQOzbtlY4f0dNecNWTFNUaX/yv5Tgnb4NjhiFyt4w9unZ5IWj LG1SSqh1MFZXSmukDPkMFG97vfvlGDL4aGuUisVEkUvelRl/XyeenTZ+ap0dYmVX f3/dVePo4gAEfEDkWKecilLmhaFZrvRJb6GwUJxe7pNvbSj0g59D/LCoqlYdsj+N UCC+IPaw0MZm44HppCzVDt+3Vb8wR55Ikt7P7NYhVDD8w2PBLsODzVKAWf/lb1YP l53KNqi1QsrnKaZfQ/MS7MRW3yXoPD/C7OeppGl/bXfUu47ElJ2sc8AeEnhSDoxH iX3/BZG9m8LxdfftOqVvmyrjXlBECUEw3nui4Ojuq1wBD6dJ7TtUdkVeBzNjs1Ba OiSXfT+D6IGJ8pkXAH1e9+BUm7LFf+rjD9DG1xfX3zcJc2+DRcBcU01iNu991nqv ddhPVVjtmbI= =qsgQ -----END PGP SIGNATURE----- --Sig_/0LwBl0ZqoB0JVHlG7jrm6OA--