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Old 07-07-2008, 04:19 PM
"Jim Lester"
 
Default Changes to readsector0

Could somebody help me understand what happened to readsector0? It used
to work perfectly for our SAN systems. Then with 0.4.8 in SLES SP2 it
would report all paths as down. Did something change that I missed?
Thanks.

---
Jim Lester | Linux Product Specialist
Jim.Lester@Compellent.com
(o) 952.294.2802
(c) 763.218.6012
Compellent Technologies | www.compellent.com



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Old 07-08-2008, 12:41 PM
"Romanowski, John (OFT)"
 
Default Changes to readsector0

Hi,
I use readsector0, moving to SLES10 SP2 soon and am interested in your
problem description.
Could you give more details about the problem you're seeing with
readsector0?


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-----Original Message-----

From: dm-devel-bounces@redhat.com [mailto:dm-devel-bounces@redhat.com]
On Behalf Of Jim Lester
Sent: Monday, July 07, 2008 12:20 PM
To: dm-devel@redhat.com
Subject: [dm-devel] Changes to readsector0

Could somebody help me understand what happened to readsector0? It used
to work perfectly for our SAN systems. Then with 0.4.8 in SLES SP2 it
would report all paths as down. Did something change that I missed?
Thanks.

---
Jim Lester | Linux Product Specialist
Jim.Lester@Compellent.com
(o) 952.294.2802
(c) 763.218.6012
Compellent Technologies | www.compellent.com


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Old 07-08-2008, 02:00 PM
Konrad Rzeszutek
 
Default Changes to readsector0

On Tue, Jul 08, 2008 at 08:41:48AM -0400, Romanowski, John (OFT) wrote:
> Hi,
> I use readsector0, moving to SLES10 SP2 soon and am interested in your
> problem description.

The manpage for SLES10 SP2 multipath.conf mentions this:

" path_checker The default method used to determine the paths’ state. Possible values are

directio Read the first sector with direct I/O.

.... snip ..

readsector0 (Deprecated) Read the first sector of the device.

Default value is directio. Using readsector0 as
path_checker is deprecated as it’s reported to not work correctly on certain devices.
"


So you should be able to replace 'readsector0' with 'directio' in your multipath.conf file.

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Old 07-08-2008, 07:11 PM
"Jim Lester"
 
Default Changes to readsector0

Is there any reason to use directio over tur if the system supports tur?

---
Jim Lester | Linux Product Specialist
Jim.Lester@Compellent.com
(o) 952.294.2802
(c) 763.218.6012
Compellent Technologies | www.compellent.com



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Old 07-08-2008, 09:50 PM
Konrad Rzeszutek
 
Default Changes to readsector0

On Tue, Jul 08, 2008 at 02:11:46PM -0500, Jim Lester wrote:
> Is there any reason to use directio over tur if the system supports tur?

No. directio is much slower than tur. Think of tur as 'ping' and directio as
doing a HTTP request - much heavier.

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