Skip to main content
NetApp Response to Russia-Ukraine Cyber Threat
In response to the recent rise in cyber threat due to the Russian-Ukraine crisis, NetApp is actively monitoring the global security intelligence and updating our cybersecurity measures. We follow U.S. Federal Government guidance and remain on high alert. Customers are encouraged to monitor the Cybersecurity and Infrastructure Security (CISA) website for new information as it develops and remain on high alert.
NetApp Knowledge Base

CPU utlization high due to high nwk_lg domain

Views:
48
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9 

Issue

  • CPU utilization high

Example:

cluster::*> run -node node1 sysstat 1                                    
 CPU     NFS    CIFS    HTTP     Net   kB/s    Disk   kB/s    Tape   kB/s  Cache
                                  in    out    read  write    read  write    age
53%    5324   48229       0   38327   6833  127216 390644       0      0     6s
64%    6208   38916       0   64143  10034  419764 1445352       0      0     6s
50%   26610   51969       0   73790   8921  119760 382280       0      0     6s
53%   29072   57445       0  125694  10797  106164 408976       0      0     6s
89%   15387   45833       0  120733   8356  176208 521896       0      0    10s
99%   15003   48234       0  131641   7639  190944 511900       0      0     2
 99%   12012   64723       0  105238  16576  373572 512840       0      0     0s
99%   15154   35868       0  148367  13014  255076 405512       0      0     2
 99%   12834   34674       0  115071   6865  215028 550032       0      0     2
 99%   12465   32334       0  133452  17632  414064 679288       0      0     2
 99%   13036   37854       0  126981   8369  204972 402760       0      0     3
 CPU     NFS    CIFS    HTTP     Net   kB/s    Disk   kB/s    Tape   kB/s  Cache
                                  in    out    read  write    read  write    age
99%   13897   33801       0  141796   3869  104280 335868       0      0     2
 99%   12403   30245       0   87923   9940  319380 821176       0      0     2s
99%   10065   29574       0  172745   8461  158264 417404       0      0     2s
99%   11967   33489       0  154454   9136  206668 564908       0      0     3
 99%   11428   34399       0   81521   3313  136904 391944       0      0     2

  • CPU utilization high with high nwk_lg domain.

cluster::> node run -node <node_name>
node> priv set diag
node*> sysstat -M

 

Example:

sysstat-M.jpg

  • a huge amount of fragments received  from output of  "netstat -s".

Example:

> ip:
>             645136792449 total packets received                     
>             154113333490 fragments received                           <<< Here>>>
>             7271533072 packets reassembled ok                      
>             464498769419 packets sent from this host           
>             801059272 output datagrams fragmented                           
>             13545054029 fragments created                                              
> icmp:
>             Output histogram:
>                             echo reply: 19561080
>                             destination unreachable: 273761                               
>             Input histogram:
>                             echo reply: 5331332
>                             destination unreachable: 708
>                             echo: 19561716
>                             time exceeded: 8556                

  • NFS over UDP.
Scan to view the article on your device
CUSTOMER EXCLUSIVE CONTENT

Registered NetApp customers get unlimited access to our dynamic Knowledge Base.

New authoritative content is published and updated each day by our team of experts.

Current Customer or Partner?

Sign In for unlimited access

New to NetApp?

Learn more about our award-winning Support