[CentOS] network problems

m.roth at 5-cent.us m.roth at 5-cent.us
Thu Mar 1 17:31:12 EST 2012


Nataraj wrote:
> On 03/01/2012 08:15 AM, m.roth at 5-cent.us wrote:
>> We just moved a user, who deals with a *lot* of data, to a new server,
>> since his old NFS home directory was on a disk that had started showing
>> problems.
>>
>> Now, i/o is about six times slower, my manager reports.
>>
>> After a fair bit of googling, I started looking at tc and ip, and found
>> the following: from ip address show, first, on the old home directory
>> server,
>>  eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast qlen 1000
>> then, on the new:
>>  eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen
>> 1000
<snip>
> Are you sure your performance problems are network related?  Have you
> measured performance of the filesystems on the two servers?   You may
> have a data alignment problem with your disk partitions.

He did. It's not disk-related.

        mark



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