----- Original Message ----- > From: "Alexander J. Maidak" <[email protected]> > To: "Patrick M. Landry" <[email protected]> > Cc: [email protected] > Sent: Wednesday, August 17, 2011 9:07:12 PM > Subject: Re: [lopsa-tech] Poor NFS performace from CentOS5 client to > Oracle (Sun) Unified Storage NAS
> Is the filer more then 80% full? Is it slow for writes and reads or > just writes? How slow is slow and what do you expect "fast" to be? It is not more than 80% full. The speed problem is most noticeable when asking for a listing in the directory with the 7000 subdirectories. It is not uncommon for that command to take 30 seconds to a minute or more to complete from the CentOS5 hosts. It doesn't take more that 5 seconds on the Solaris hosts. > Are you seeing lots of metadata or data misses? If you go into > analytics and select ARC Accesses broken down by hit/miss then select > metadata misses broken down by l2arc eligibility this should give you > a > hint if your filer needs more l2arc to support the additional > metadata > load of all those files. I haven't been collecting those long-term but at the moment the ratio of data hits to data misses is about 1 to 3. The ratio of metadata hits to metadata misses is 80 to 1. -- patrick
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