Hi,
we’re using kopano on a UCS server and have an additional UCS-Server as DC.
As kopano is doing a kerberos requests almost for every action a user take in the webapp, we have nearly a billion kerberos requests per day. We only have around 100 users!
As this renders our samba server almost unusable, i’m seeking for help here.
Any ideas?
iowait is all the time at ~30% on samba server due to the high amount of ongoing requests against ldap/kerberos service.
top - 07:43:18 up 2 days, 18:58, 1 user, load average: 1,16, 1,04, 0,99
Tasks: 216 total, 2 running, 214 sleeping, 0 stopped, 0 zombie
%Cpu0 : 3,4 us, 0,0 sy, 0,0 ni, 96,6 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
%Cpu1 : 3,2 us, 0,0 sy, 0,0 ni, 96,8 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
%Cpu2 : 0,0 us, 0,0 sy, 0,0 ni,100,0 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
%Cpu3 : 0,0 us, 0,0 sy, 0,0 ni,100,0 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
%Cpu4 : 51,7 us, 13,8 sy, 0,0 ni, 3,4 id, 27,6 wa, 0,0 hi, 3,4 si, 0,0 st
%Cpu5 : 0,0 us, 0,0 sy, 0,0 ni,100,0 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
%Cpu6 : 3,4 us, 0,0 sy, 0,0 ni, 93,1 id, 0,0 wa, 0,0 hi, 3,4 si, 0,0 st
%Cpu7 : 3,4 us, 3,4 sy, 0,0 ni, 93,1 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem : 16049028 total, 8481872 free, 5749512 used, 1817644 buff/cache
KiB Swap: 962556 total, 962556 free, 0 used. 9938888 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1996 root 20 0 5191572 4,280g 17988 R 66,7 28,0 1361:38 samba
Total DISK READ: 0.00 B/s | Total DISK WRITE: 2.54 M/s
Current DISK READ: 0.00 B/s | Current DISK WRITE: 2.62 M/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
1996 be/4 root 0.00 B/s 2.53 M/s 0.00 % 24.40 % samba: conn[kdc_tcp] c[ipv4:172.16.2.4:37328] s[ipv4:172.16.2.2:88] server_id[1996.46]
481 be/3 root 0.00 B/s 6.96 K/s 0.00 % 0.43 % [jbd2/sda1-8]
2560 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % samba: conn[ldap] c[ipv4:172.16.2.4:55068] s[ipv4:172.16.2.2:389] server_id[2560]
172.16.2.2 is UCS/samba
172.16.2.4 is Kopano.
Any help is greatly appreciated.