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Old 06-19-2010, 11:37 PM   #1
srithi
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Registered: Jul 2009
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How to find the /dev/Device mapping for NFS file system in RHEL


Hello,

Found the below from RedHat Knowledgebase

The Completely Fair Queuing (cfq) scheduler in Red Hat Enterprise Linux 5appears to have worse I/O read performance than in version 4. It appears as though the Completely Fair Queuing I/O scheduler (cfq) has a regression and thus exhibits reduced read-side throughput which can affect performance for both local and NFS mounted file systems.
One way to mitigate this is to set the cfq's slice_idle parameter to zero. To change this value, execute the following command echo 0 > slice_idle in the /sys/block directory appropriate for your situation, as shown below
echo 0 > /sys/block/hda/queue/iosched/slice_idle

We are using NFS file systems in RHEL 5.3. I would like to know how to find which /dev/Device is being used by the NFS file systems, so that I could try setting the slice_idle to '0' to see if there is any difference in performance? In /etc/fstab I only see the actual NAS volumes for the NFS file systems.


Thanks
 
Old 06-20-2010, 01:44 AM   #2
btmiller
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You'll have to look on the NFS server. Look int /etc/exports to see what is being exported and then in /etc/fstab to see how the exprted volume(s) are mounted.
 
Old 06-20-2010, 09:27 AM   #3
srithi
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Registered: Jul 2009
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How to find the /dev/Device mapping for NFS file system

Actually, there are no entries in /etc/exports file. Also, I am using a VMWare Virtual server and not a dedicated node. Not sure if it is different for Virtual server. Please let me know.

Thanks
 
  


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