Isilon Intermittent slow performance seen while accessing files for the first time over SMB

To confirm if the cluster is facing the issue documented in this KB, run the following statistics command to check the latency for LSASS operations:

# isi statistics protocol list --protocols=lsass_in,lsass_out --nodes=all --sort=timeavg --limit=10 -d

 Ops    In  Out    TimeAvg  TimeStdDev  Node     Proto          Class                     Op
12.3   0.0  0.0  3163314.5   1890297.9     4  lsass_in          other      lsa:pac_to_ntoken
  7.3   0.0  0.0  5656841.0   3072360.8    12  lsass_in          other      lsa:pac_to_ntoken
  7.0   0.0  0.0  9009370.0   2337733.0     1  lsass_in          other      lsa:pac_to_ntoken
  5.2   0.0  0.0  2064725.1   1497097.5     2  lsass_in          other      lsa:pac_to_ntoken
  4.8   0.0  0.0  8029455.0   3292905.8     3  lsass_in          other      lsa:pac_to_ntoken
  4.7   0.0  0.0  1394934.1    592686.2    11  lsass_in          other      lsa:pac_to_ntoken
  4.2   0.0  0.0 21618318.0  15180645.0     6  lsass_in          other      lsa:pac_to_ntoken
  4.0   0.0  0.0  7413947.5   1518084.4     5  lsass_in          other      lsa:pac_to_ntoken
  3.1   0.0  0.0  1251842.8    438924.1    26  lsass_in          other      lsa:pac_to_ntoken
  3.0   0.0  0.0 23923752.0  15054548.0    13  lsass_in          other      lsa:pac_to_ntoken

We notice that the TimeAvg for pac_to_ntoken LSASS operation is very high. [In the above output, TimeAvg is in microseconds]
Also, on checking the SMB protocol statistics, we notice high latency times for Session Setup:

# isi statistics protocol list --protocols=smb1,smb2 --nodes=all --sort=timeavg --limit=10 -d

  Ops     In    Out    TimeAvg  TimeStdDev  Node  Proto          Class              Op
30.0  76.4k   7.2k  1529625.2   2925519.5    12   smb2   session_state             session_setup
18.3  30.7k   4.0k  1958311.6   2178009.5     2   smb2   session_state             session_setup
16.4  46.1k   3.9k  2710180.8   2546982.5     4   smb2   session_state             session_setup
14.1  21.7k   4.1k  8245491.5  13119604.0     3   smb2   session_state             session_setup
  8.0  21.0k   2.0k   450049.3    519492.5    27   smb2   session_state             session_setup
  7.7  27.6k   1.9k  8541166.0   3304804.8     1   smb2   session_state             session_setup
  7.0  18.9k   1.7k   939299.2    792166.9    11   smb2   session_state             session_setup
  5.6  10.5k   1.2k 36783816.0  13622883.0    13   smb2   session_state             session_setup
  5.3  14.8k   1.1k  6898343.0   2006835.1     5   smb2   session_state             session_setup
  3.3  10.9k  843.8  2356597.2   1650669.1    26   smb2   session_state             session_setup
  2.2   5.9k  490.3 28361250.0  12338387.0     6   smb2   session_state             session_setup

If OneFS was authenticating an Active Directory (AD) group that was included in a Local group, OneFS might have authenticated against every AD group the user was a part of for each Local group the user was a part of.
If this issue occurred, users might have experienced slowness when accessing files.

This issue is fixed in OneFS 8.0.0.6.

DELL EMC Engineering has already investigated this problem. A permanent fix is available. Contact the DELL EMC Customer Support Center and quote this article number for more information.

If the cluster is running OneFS 8.0.0.4, apply the patch (supplied by DELL EMC Support).

 
During installation or removal of this patch, the following services will be stopped and restarted automatically:

Dell EMC Isilon recommends that you install the patch during an off-hours maintenance window to minimize the disruption of service to clients.