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mounts going read-only on some guests VMS using NFS datastore

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Hi everyone, I have a problem with some GUEST VMs failing when their mounted disks become mounted read-only.  This problem is irregular, and does not occur on every VM.  All VMs use the same NFS datastore and only some of them have remounted their virtual disks read-only.

 

 

We have 2 ESX 3.0.2, 616618 servers and only some, and HA working fine using this NFS datastore.  The NFS share is mounted using a single gigabit NIC and is on the same network as the EMC Celerra that provides it via a dedicated NIC. 

 

 

I noticed when doing disk-intensive activities on a VM last night 3 other VMs on that ESX server went into read-only mode, but 6 othes did not, all of them using the same NFS share.  We detect the problem relatively quicky via nagios, but I noticed nothing in any of the VMWARE GUIs or the hostd-1.log that tipped me off to the problem.

 

 

Does any one know 1) why this is occuring 2) how to prevent it 3) how to detect it through vmware?

 

 

I appreciate any help. Thanks!

 

 

Rohit

 

 


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