Peter_Sero
4 Beryllium

Re: Ask the Expert: Isilon Performance Analysis

Damal, there is no need for re-transmitting. How asynchronous NFS3 writes actually work has been defined in "RFC 1813 - NFS Version 3 Protocol Specification" (google for it; can't post links here). The key is the COMMIT mechanism.

Cheers

-- Peter

Rdamal
2 Iron

Re: Ask the Expert: Isilon Performance Analysis

Found the RFC in IETF website and I guess I am clear with that.

Thank you so much Peter

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gunalan1
1 Nickel

Re: Ask the Expert: Isilon Performance Analysis

Dear John,

           I would request you to please explain me the following which are related to Coherent cache and number of disks in disk pool in Isilon :

1. How Isilons/OneFS forms coherent caches (READ/WRITE) across all the nodes which are part of the same cluster

2. Why the number of disks in a (disk pool = 6disks per node, per node pool up to 40 nodes ) disk pool is limited with 6 disk drives only.

     Thanks in advance.

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Rdamal
2 Iron

Re: Ask the Expert: Isilon Performance Analysis

Hi John,

Can you take a look at the attached output for the isi statistics drive --top --long -nall --orderby=OpsIn. I see the Queued I/O is >1. Does it mention we need to add few more nodes to pool, or any other point you want to add on the output

Its a NL400 node running on OneFS 7.0.2.4

stats drive.JPG.jpg

DC1-cluster% sudo isi statistics query -snode.ifs.cache.oldest_page_age

  NodeID node.ifs.cache.oldest_page_age

       2                           8128

average                    8128

Thanks,

Damal

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johnkeo
1 Copper

Re: Ask the Expert: Isilon Performance Analysis

thanks for sharing such a brief and useful information

character count

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