Date: Mon, 10 Jul 2006 13:33:04 +0400 From: Stanislav Sedov <stas@310.ru> To: freebsd-geom@freebsd.org Subject: Re: Which geom to use? Message-ID: <20060710133304.47d222de@localhost> In-Reply-To: <20060709155759.GA67709@psconsult.nl> References: <20060709155759.GA67709@psconsult.nl>
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--Sig_xeoVbC._HefzLU+b5uus55y Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: quoted-printable =EE=C1 Sun, 9 Jul 2006 17:57:59 +0200 Paul Schenkeveld <fb-geom@psconsult.nl> =DA=C1=D0=C9=D3=C1=CE=CF: > Hi, >=20 > Some installations just need a lot of filesystems (e.g. systems with > many jails) making geom_bsd a bad choice because it only supports > 7 partitions. So far I've been using vinum and gvinum for the task > of dividing my disk which is also quite convinient for adding new > partitions in so far unallocated space later on. >=20 > On systems with mirrored disks (or RAID5) this works fine but on > systems with a single disk this approach has a very bad consequence: > when a disk error occurs anywhere on the disk, all subdisk and thus > all volumes on this drive object become invalid and the system > crashes. >=20 > Another approach is to slice up the disk in MBR and divide each slice > in 7 patitions with bsdlabel giving you 28 partitions to use and less > freedom to re-allocate later on because it's a very hard job to change > the MBR slices without doing a complete re-partitioning. >=20 > I've heard of people putting filesystems in files using md(4) but I > fear the performance penalty of going through a filesystem layer > twice. >=20 > So what would you guys recommend in this case, gpt(4)? Or is there > some kind of geom that does just the volume management of gvinum > without marking all volumes down at the first media error? >=20 I was using gpt to handle 20+ partitions on 2TB array for a long time with success. So it's well suited for this. --=20 Stanislav Sedov MBSD labs, Inc. <ssedov@mbsd.msk.ru> =F2=CF=D3=D3=C9=D1, =ED=CF=D3=CB=D7=C1 http://mbsd.msk.ru -------------------------------------------------------------------- If the facts don't fit the theory, change the facts. -- A. Einstein -------------------------------------------------------------------- PGP fingerprint: F21E D6CC 5626 9609 6CE2 A385 2BF5 5993 EB26 9581 --Sig_xeoVbC._HefzLU+b5uus55y Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEsh7QK/VZk+smlYERAiEVAJ9VaOLOvVo2wNoVv4QIC3xoIvi23QCdHFKW 4EOgFeAcx5eJy6+o9a09hRE= =rHUC -----END PGP SIGNATURE----- --Sig_xeoVbC._HefzLU+b5uus55y--
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