Forum Discussion

Pratya_109955's avatar
Pratya_109955
Icon for Nimbostratus rankNimbostratus
Feb 25, 2013

Howto obtain memory usage of persistence table

Are there any way to obtain memory usage of persistance / session table?

 

i have memory capacity issue on my 8800, (sweeper update) and i think the major usage come from persistence table which is set timeout = 6 hours. I can count amount of total persistence record by using command " b persist all show all | wc". But i dont know howto obtain memory usage of each record. Kindly advise,

 

thank you guys in advance

 

 

management
monitoring

1 Reply

  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Feb 25, 2013
    one simple persistence record is about 112 bytes. anyway, you may grep "persist" from "b memory", "tmsh show sys memory" or "tmctl memory_usage_stat" command output.

    sol5779: The amount of memory the BIG-IP LTM allocates for a simple persistence record

    https://support.f5.com/kb/en-us/solutions/public/5000/700/sol5779.html

    by the way, you are not running 10.x, are you?

    sol10094: Running the 'bigpipe persist show' command on a system with a large number of persistent connections can cause system instability

    http://support.f5.com/kb/en-us/solutions/public/10000/000/sol10094.html 

    [root@ve10:Active] config  tmsh list ltm virtual bar
ltm virtual bar {
    destination 172.28.19.252:http
    ip-protocol tcp
    mask 255.255.255.255
    persist {
        source_addr {
            default yes
        }
    }
    pool foo
    profiles {
        http { }
        tcp { }
    }
    snat automap
}

 no persistence record

[root@ve10:Active] config  b persist
No Persistence Table Entries were found.

[root@ve10:Active] config  tmsh show sys memory|grep -i "subsystem\|persist"
Sys::SubSystem Memory
SubSystem                     Alloc (bytes)  Max Alloc (bytes)  Object Size
http_persist                              0                  0           72
persist                                   0                  0          112
persistence (variable)                    0                  0            1

 1 persistence record

[root@ve10:Active] config  b persist
PERSISTENT CONNECTIONS
    Type           Virtual                Node
    source addr    172.28.19.252:80   200.200.200.101:80

[root@ve10:Active] config  tmsh show sys memory|grep -i "subsystem\|persist"
Sys::SubSystem Memory
SubSystem                     Alloc (bytes)  Max Alloc (bytes)  Object Size
http_persist                              0                  0           72
persist                                 112                112          112
persistence (variable)                    0                  0            1