Re: Isilon-Users High latency, good throughput and various oddness

[Peter Serocka]

Did you check wether the cluster is overloaded or has other signs of problems (in /var/log/messages)?

The built-in CLI tools a great for live monitoring the traffic and access; have a look at isi statistics client (and … heat) to start with (use options for "top" mode and inclusion of "all nodes").

For the Macs:

Have you enabled "Compute all sizes" in Finder's "View Options" AND have you populated the accessed NAS shares with a huge number of files recently? These together would keep Finder quite busy…

There is a nice doc or White Paper by EMC on best practices for Macs with Isilon, check it out.

-- Peter



On Fri 2 Aug '13 md, at 20:54 st, Alfred Wallace <blor...@gmail.com> wrote:

> Since few days, we meet several access problems on some MacPro stations (with various Mac OS version, 10.6.8 and 10.8).
> Tests with BlackMagicDesign's software Disk Speed Test shows high latency in write (ca 1s) and after, good throughput. Pings are OK (ca 0.3 ms).
> The affected stations are MacPro 5,1, those who need disabling TCP delayed ACK. But only one is not affected.
>
> net.inet.tcp.delayed_ack=0
>
>
> A test with value 2 (like I've seen in another topic) changes nothing.
>
> Change synchronous --> asynchronous NFS access, no effect except better throughput (?).
>
> Strangely, even the Finder is affected. To open a (local !) folder could take few seconds. Unmount Isilon and then the Finder has no more latency.
>
> These problems occured before add new node. After that (I should maybe open a distinct topic), one IP (ext-1) assigned for new node and then the pool0 disappears from WebAdmin / Cluster / Networking but still functionnal in Node menu (Node status / subnet0).
>
> Thanks for your attention, and please apologize my english speaking.
>
> Config. :
> Isilon IQ
> 6x 6000X
> OneFS v5.5.4
> Asynchronous NFS.
> Active jobs : AutoBalance, MediaScan (paused).
> No under support contract.
>
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