[Linux-cachefs] cachefs and index keys

[Grant Street]

Hi

We are using EMC's Isilon storage as a NFS server consisting of over 50 
storage and networking nodes. It presents itself as one hostname eg 
isilon.sample.com and one very large directory tree, but dynamically 
resolves to multiple IP addresses. These IP addresses have the advantage 
of floating to different physical nodes in order to help balance the 
networking load when thousands of clients are connecting.

The downside of this scheme is that currently cachefs would invalidate 
the cache if the IP address (resolved from isilon.sample.com) changes on 
reboot or automount expire and remount. This is because the cache key is 
based on the IP address rather than the fqdn.

I have a case with redhat 00922150 and a bugzilla id 1018358. I was 
wondering what your thoughts would be on changing the cache key to a 
fqdn rather than an IP address?

Unfortunately with the size of the isilon cluster we would not be able 
to do anything with traditional IP load balancers as the throughput and 
number of clients is too high.

Thanks in advance.

Grant