[dm-devel] 4k block LUN problem

[Vassar, Bob]

Hello Alasdair,

I have used tur and this allows the system to boot. When I run "ll
/dev/mpath* I see the dm device created. All appears to be working OK.
Fdisk also reports the same number of devices as paths to the device.  
When I try to make the file system (ext2 or 3) the make fails on writing
super blocks. 

If I remove the multipath.conf file and make a file system on the 4k
block sd device the file system makes and I can read/write to the
device. As soon as try this again with the device-mapper the process
fails. 

If I reformat the LUN as 512byte blocks the device-mapper works and I
can make the file system.  

Thanks,

Bob


-----Original Message-----
From: dm-devel-bounces at redhat.com [mailto:dm-devel-bounces at redhat.com]
On Behalf Of Alasdair G Kergon
Sent: Wednesday, June 13, 2007 1:57 PM
To: device-mapper development
Subject: Re: [dm-devel] 4k block LUN problem

Try using an alternative path checker like tur or directio.

readsector0 seems to have '512' hard-coded - this ought to get fixed.

Alasdair
-- 
agk at redhat.com

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