I had a similar situation in our college lab. I think it is fedora core 6
problem and I didn't us a firewall. Ubuntu server worked fine.

On 4/24/07, sunil dwivedi <[EMAIL PROTECTED]> wrote:
>
> Just switch off linux firewall. any try
>
> ----- Original Message ----
> From: Cheedhu <[EMAIL PROTECTED] <i_cheedhu%40yahoo.co.in>>
> To: [email protected] <ilughyd%40yahoogroups.com>
> Sent: Tuesday, 24 April, 2007 5:31:57 PM
> Subject: [TwinCLinG] I/O error on device-mapper RAID1 device
>
> Hi
>
> I have a server running on the following config
> DELL PowerEdge SC1425, Xeon 3.00 GHz, 2GB RAM, 2x73GB SCSI HDD on
> RAID 1
> Fedora Core 6, Kernel Kernel 2.6.18-1.2798. fc6 x86_64 SMP
>
> The server was not responding though it was pingable!
> no response to any service.
> Even SSH was not connecting!
> unable to login even from the console so I could not get much details
> following is all that I could get!
>
> ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~
> ~~~~
> I/O error, dev sdb, sector 87524995
> device-mapper: raid1: A read failure occured on a mirror device.
> device-mapper: raid1: Trying different device. Unable to handle
> kernel NULL pointer dereference at 000000000000000 RIP
> ---kernel stack trace but unable to copy it-----
> ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~
> ~~~~
>
> google search indicated that this was from read_callback( ) function
> in device-mapper ioctl
> The server is working after a reboot
>
> what could have caused this?
> and any suggestions of how this could be prevented?
>





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