Hi
I have seen very high CPU utilisation (up to 99%) when users were attempting to connect via CIFS (initial browsing only, no significant data transfers). Packet traces at the time showed unusually high numbers of fragmented packets which pointed to local networking issues and our NT4 (!) domain controllers. The problem got fixed by a power outage which rebooted all our edge switches!
I am still concerned that a network issue between clients and the filer should cause such high (debilitating) processor load on the filer.
Regards Francois
Christian Mikovits wrote:
a systat -s -u 1 gives me the following output:
tigershark> sysstat -s -u 1 CPU Total Net kB/s Disk kB/s Tape kB/s Cache Cache CP CP Disk ops/s in out read write read write age hit time ty util 49% 2255 70895 2009 3306 20734 0 0 47 100% 78% : 22% 37% 2329 74366 2150 76 0 0 0 47 99% 0% - 12% 38% 2642 74641 2460 100 24 0 0 47 97% 0% - 3% 39% 2880 67314 3378 920 0 0 0 47 96% 0% - 13% 54% 3730 61661 3252 4645 8 0 0 47 95% 0% - 31% 48% 5236 70522 3813 541 24 0 0 47 97% 0% - 6% 47% 4534 73570 3512 350 0 0 0 47 98% 0% - 4% 48% 5146 75076 3949 381 0 0 0 47 97% 0% - 4% 48% 4896 73286 3505 465 24 0 0 47 98% 0% - 6% 44% 3996 74177 3050 254 8 0 0 47 99% 0% - 5% 51% 3580 66122 2863 9770 1391 0 0 47 100% 26% T 11% 57% 5194 69234 3855 4230 23416 0 0 47 99% 100% : 23% 44% 3128 73071 3734 905 1428 0 0 47 98% 17% : 10% 46% 4474 74810 3876 392 0 0 0 47 99% 0% - 4% 41% 3437 76071 2899 60 32 0 0 47 99% 0% - 2% -- Summary Statistics ( 15 samples 1 secs/sample) CPU Total Net kB/s Disk kB/s Tape kB/s Cache Cache CP CP Disk ops/s in out read write read write age hit time ty util Min 37% 2255 61661 2009 60 0 0 0 47 95% 0%
- 2% Avg
46% 3830 71654 3220 1759 3139 0 0 47 98% 14% * 10% Max 57% 5236 76071 3949 9770 23416 0 0 47 100% 100% * 31%
does anybody now why the net input is incredibly high compared to the written disk data?
thx,
christian