From: Matt Schillinger <mschilli@vss.fsi.com>
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] disk naming
Date: Fri Jan 3 10:59:02 2003 [thread overview]
Message-ID: <1041613503.20036.49.camel@mosix> (raw)
In-Reply-To: <20030103174618.Z9539@zealot.blacknet.de>
If i'm NOT using devfs, can i reliably (assuming that disks are on the
same scsi id/lun/host channel) use lvm?
Scenario:
LV is created with device /dev/sdd, which is on host channel 2
Machine is shutdown, and a new raid is connected on host channel 1, with
one disk.
Machine is restarted, and the 1 disk on the host channel 1 raid takes
/dev/sdd. The original disk is now /dev/sde.
Will LVM find the correct disk?
Matt Schillinger
mschilli@vss.fsi.com
On Fri, 2003-01-03 at 10:46, Goetz Bock wrote:
>
> On Fri, Jan 03 '03 at 10:08, Matt Schillinger wrote:
> > this should be a simple question, but I can't find a direct discussion
> > in the lvm documentation. I believe that i have found that LVM will find
> > appropriate PV's regardless of their name (sda,sdb).. Is this true?
> Kind of. When you created (maybe even just used) a PV/VG with DEVFS it
> will only work with devfs.
> IIRC when you compile DEVFS into the kernel, but do not mount it, you
> can create PVs, but createvg will not find them unless you mount devfs.
>
> > Do i need devfs to ensure that i always have the same disk naming, or
> > will LVM handle this for me?
> devfs does not ensure you have the same names.
>
> > I am currently using scsidev for naming purposes, but have found that
> > vgcreate will not work with scsidev device names
> > (/dev/scsi/sdh0-0c0i4l2p1)
> > /dev/scsi/sd(host=0,scsiid=4,LUN=2,partition #=1)
> Most likely the userspace tools do not search the /dev/scsi/sdxxx
> devices for PV signatrue. IIRC there is one file where you can add them.
> It's in tools/lib/lvm_check_partitioned_dev.c but I've no idea how to
> add your devices.
> --
> Goetz Bock (c) 2002 as blacknet.de - Munich - Germany /"\
> IT Consultant GNU FDL 1.1 secure mobile Linux everNETting \ /
> X
> ASCII Ribbon Campaign against HTML email & microsoft attachments / \
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
--
Matt Schillinger
System Administrator
FlightSafety International
mschilli@vss.fsi.com
314-551-8403
next prev parent reply other threads:[~2003-01-03 10:59 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-03 10:02 [linux-lvm] disk naming Matt Schillinger
2003-01-03 10:45 ` Goetz Bock
2003-01-03 10:59 ` Matt Schillinger [this message]
2003-01-03 11:03 ` Patrick Caulfield
2003-01-03 12:53 ` Matt Schillinger
2003-01-03 13:12 ` Steven Lembark
2003-01-03 12:30 ` Steven Lembark
2003-01-03 13:20 ` Patrick Caulfield
2003-01-04 1:09 ` Steven Lembark
2003-01-04 3:59 ` Patrick Caulfield
2003-01-04 12:27 ` Steven Lembark
2003-01-04 12:40 ` Theo Van Dinter
2003-01-04 13:55 ` Patrick Caulfield
2003-01-08 10:28 ` Matt Schillinger
2003-01-03 12:21 ` Steven Lembark
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