What did you do to figure out that symlinks were using so much of the CPU load?
I've got a 720 that's becoming very unresponsive under high loads. It doesn't get up to 100%, but it does hit 85-90%. This is during times of high writes to one volume, on the order of 5-10 Megs/sec.
The weirdest part is when it gets really slow, I loose quite a few large pings to the filer from the effected machine. This makes me worry about my network as well. I've had many duplex issues cause the same kinds of problems before, but I've checked duplex on all of my ports.
Is it normal for high writes to bog down a filer this much? Could it be symlinks causing my woes? Any tips for solving this problem?
I've turned on per host nfs stats logging, any tips of decoding this information? I assume that the machine with the highest number of writes would be the offending host that's slamming my filer?
Thanks for any info you may be able to provide.
- Eli
Michael Rogan wrote:
We found that symlinks were causing 60% of the CPU load on our F740.
Sent from my BlackBerry Wireless Handheld (www.BlackBerry.net)
-----Original Message----- From: Jean-Christophe Smith jsmith@vitalstream.com To: toasters@mathworks.com toasters@mathworks.com CC: jsmith@publichost.com jsmith@publichost.com Sent: Thu Oct 25 13:51:06 2001 Subject: F720 CPU Maxing out
We have a NetApp F720 doing both NFS and CIFS using mixed mode security. It has 256 megs of ram. During parts of the day the CPU and RAM spike to %100 utilization. We do a lot of sendmail, windows media, apache and IIS traffic over the filer.
I have two questions:
- Is there a way we can add more ram, perhaps 512 or a gig? The docs say we
are maxxed out with 256. 2. Is it possible that the extra cpu overhead that provides the NFS/CIFS user mapping is causing much of the ram and cpu starvation? Perhaps going to a simpler security model would offload a lot of CPU cycles.
Any suggestions would be appreciated..
Jean-Christophe Smith VitalStream jsmith@vitalstream.com