From: Patrick Mansfield <patmans@us.ibm.com>
To: Joel Becker <Joel.Becker@oracle.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>,
Giuliano Pochini <pochini@shiny.it>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
Mike Anderson <andmike@us.ibm.com>
Subject: Re: [patch for playing] Patch to support 4000 disks and maintain
Date: Fri, 11 Apr 2003 11:12:32 -0700 [thread overview]
Message-ID: <20030411111232.A7756@beaverton.ibm.com> (raw)
In-Reply-To: <20030411175736.GY31739@ca-server1.us.oracle.com>; from Joel.Becker@oracle.com on Fri, Apr 11, 2003 at 10:57:37AM -0700
On Fri, Apr 11, 2003 at 10:57:37AM -0700, Joel Becker wrote:
> > Fortunately, the multipath solution Mike Anderson & Patrick Mansfield
> > working on, colapses all the disks you see thro multiple paths into
> > number of realdisks (4000). So you don't really need extra devices
> > to support multipathing.
>
> Yes, but what if I want to see the multiple paths? Does their
> solution allow you to specify the path behind the 'realdisk'? Does it
> allow querying of the paths?
>
> Joel
Seeing the path to disk relationship - yes (via proc for now, eventually
via sysfs).
Specifying from user space what path goes with what disk (explicitly): no,
that might require user level scanning.
Query a path - seeing and setting path states yes (via proc right now).
Using sg with a specified path - no, but on the TODO list.
I'm trying to pull the current multi-path patch up to 2.5.66 (ouch).
The last functioning patch was against 2.5.59, some general info:
http://www-124.ibm.com/storageio/multipath/scsi-multipath/index.php
Or the patch:
http://www-124.ibm.com/storageio/multipath/scsi-multipath/releases/2.5.59-mpath-1.patch.gz
-- Patrick Mansfield
next prev parent reply other threads:[~2003-04-11 18:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-10 20:39 [patch for playing] Patch to support 4000 disks and maintain backward compatibility Badari Pulavarty
2003-04-10 20:54 ` Randy.Dunlap
2003-04-11 0:08 ` Roman Zippel
2003-04-11 1:25 ` Badari Pulavarty
2003-04-11 15:43 ` Joel Becker
2003-04-11 8:04 ` [patch for playing] Patch to support 4000 disks and maintain Giuliano Pochini
2003-04-11 15:44 ` Joel Becker
2003-04-11 16:28 ` Badari Pulavarty
2003-04-11 17:57 ` Joel Becker
2003-04-11 18:12 ` Patrick Mansfield [this message]
2003-04-11 18:35 ` Joel Becker
2003-04-11 20:04 ` Patrick Mansfield
2003-04-11 23:18 ` Joel Becker
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