[Pacemaker] Pacemaker 1.1.12 cib testing, crm_mon doesn't work

Fri Jun 13 07:35:01 UTC 2014

Hi,

The PCMK_ipc_buffer was already set to 10000000 (10M).

For testing I increased to buffer to 10000000 (100M), without results.

I decreased the buffer to the default 20480 (20K) as it then shows the 
suggested value.
If I leave it running for a couple of minutes I got these suggested values:
Jun 13 06:33:53 [62206] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (3854984 bytes 
suggested)
Jun 13 06:33:54 [62206] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (7709968 bytes 
suggested)
Jun 13 06:33:58 [62206] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (15419936 
bytes suggested)
Jun 13 06:35:55 [62206] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (30839872 
bytes suggested)
Jun 13 06:37:56 [62206] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (61679744 
bytes suggested)
Jun 13 07:16:47 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (3952852 bytes 
suggested)
Jun 13 07:16:47 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (7905704 bytes 
suggested)
Jun 13 07:18:03 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (15811408 
bytes suggested)
Jun 13 07:18:43 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (31622816 
bytes suggested)
Jun 13 07:18:48 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (63245632 
bytes suggested)
Jun 13 07:20:49 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (126491264 
bytes suggested)
Jun 13 07:22:50 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (252982528 
bytes suggested)
Jun 13 07:22:52 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (505965056 
bytes suggested)
Jun 13 07:23:57 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (1011930112 
bytes suggested)
Jun 13 07:24:51 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (2023860224 
bytes suggested)
Jun 13 07:26:52 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (-247246848 
bytes suggested)
Jun 13 07:27:22 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (-494493696 
bytes suggested)
Jun 13 07:29:22 [44112] SRV-5-1        cib:    error: crm_ipc_prepare: 
     Could not compress the message into less than the configured ipc 
limit (20480 bytes).Set PCMK_ipc_buffer to a higher value (-988987392 
bytes suggested)

There is definitely something wrong. Is it the printing of the suggested 
value or is it something else ?

If I check the cib.xml files in /var/lib/pacemaker/cib/ all files are a 
bit smaller then 300K.

Changing these buffers did not solve my problem not getting results from 
crm_mon.

Gr.
Johan

On 13-06-14 01:13, Andrew Beekhof wrote:
> On 12 Jun 2014, at 10:53 pm, Johan Huysmans <johan.huysmans at inuits.be> wrote:
>
>> Hi All,
>>
>> I deployed Pacemaker 1.1.12-rc2 on our platform to test the cib changes.
>> This was needed on our setup as it contains 6 nodes, 150 resources and the cib process was using lots of cpu.
>>
>> With a limited set of resources (6 nodes, 30 resources) everything worked as expected, including crm_mon.
>> When loading the complete set of resources we lost the crm_mon functionality on all nodes.
>> The cluster is running as expected (running all resources) however we don't have any visibility.
>>
>> I noticed that operations performing changes did actually work like (crm resource stop <resourcename>),
>> but crm resource status didn't work (using crmsh-2.0+git46-1.1.x86_64).
>>
>> I noticed that /dev/shm/qb-cib_ro* files are created, and lsof shows that they are both opened by crm_mon and cib.
>>
>>
>> When executing "crm_mon -1" I get following messages in /var/log/messages (and /var/log/pacemaker.log)
>> Jun 12 12:47:38 [8062] SRV-5-1        cib:   notice: crm_ipcs_sendv:     Response 2 to 0x1810370[17836] (1091618 bytes) failed: Resource temporarily unavailable (-11)
>> Jun 12 12:47:38 [8062] SRV-5-1        cib:  warning: do_local_notify:     Sync reply to crm_mon failed: No message of desired type
>>
>>
>> Restarting the pacemaker and cman service of 1 node didn't solve it.
>>
>>
>> What is causing this problem and how can I resolve it ?
> Almost certainly you're hitting IPC limits associated with large clusters.
>
> You should be able to tune:
>
> # PCMK_ipc_buffer=20480
>
> In /etc/sysconfig/pacemaker and then restart the cluster.
>
> Note also:
>
> # For non-systemd based systems, prefix 'export' to each enabled line
>
>
>
>
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