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01-03-2008 03:45 AM
01-03-2008 03:45 AM
buffer I/O error on device sda
I have 2 DL380G5 servers on which i have installed redhat linux ES 4. both servers are connected to a MSA 1000 using fiber channel connectors.
i have made all zoning configuration for the san switch.
i have created luns on the msa uning the CLI.
now i am trying to create partitions, volume groups and logical volumes and file systems on the created lun.
on the first server, i noticed that there is /dev/sda and /dev/sdb, and both represent the msa1000 that i have.
but when trying to access the /dev/sda, it always mention that it is uncapable to be read.so i created the patitions using the fdisk utility on the /dev/sdb.
on the second server, i can just see /dev/sda that it is unaccessible too, so i am not able to find the partitions that i have created on the msa via the other server.
on the booting of both servers, i am getting the following:
buffer I/O error on device sda, logical block 1
buffer I/O error on device sda, logical block 2
buffer I/O error on device sda, logical block 3.......
what could the problem be , and why i can't see /dev/sdb on the second server as i the first one?
thanks in advance
Samer
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01-03-2008 04:56 AM
01-03-2008 04:56 AM
Re: buffer I/O error on device sda
A couple of things to check...
Firstly make sure that the connection type for the hosts on the MSA is set to Linux. That could cause the errors you're seeing.
Secondly, it sounds like you've presented the LUNs to both servers. Are you using any Clustering software ? If not then you'll end up with corrupt file systems.
Hope this helps,
Regards,
Rob
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01-03-2008 05:32 AM
01-03-2008 05:32 AM
Re: buffer I/O error on device sda
Thanks for your answer.
first, i will install a cluster software for sure but i would make sure that the lun created is accessible by both servers , and i am till now working on just one server turned on.
could you please tell me how to set the connection type for the hosts on the MSA to Linux ?
thanks and best regards
Samer
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01-03-2008 05:36 AM
01-03-2008 05:36 AM
Re: buffer I/O error on device sda
You should check the connection profile, with the MSA CLI command:
show connection
If this is listed as Default, then it will be causing problems.
Cheers,
Rob
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01-03-2008 05:50 AM
01-03-2008 05:50 AM
Re: buffer I/O error on device sda
but do you think that the firmware version can cause the problem? and if i need to upgrade it , does it make a problem if i do it via a windows server and the servers connected are linux ? i think it does not make sense but just to make sure.
Best Regards
Samer
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01-03-2008 05:55 AM
01-03-2008 05:55 AM
Re: buffer I/O error on device sda
Cheers,
Rob
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01-04-2008 02:12 AM
01-04-2008 02:12 AM
Re: buffer I/O error on device sda
but what is still faulty is that the first server has 2 paths to the msa (/dev/sda and /dev/sdb) but the second one has just one path (/dev/sda). could this be a hardware problem? i will anyway try to switch the cables and the HBAs and see if it could be the source of the problem
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