Hi,


One more question, We have two controllers (active-standby), with the steps
mentioned below, when application on the standby node makes
saCkptCheckpointRead() call from which replica is data read from? From
active or standby replica?



We have async collocated checkpoint.



Regards,

Girish



*From:* Girish Nagaraj [mailto:[email protected]]
*Sent:* Friday, December 18, 2015 8:38 AM
*To:* '[email protected]'
*Subject:* Question regarding shared memory



Hi,



In our checkpoint application we have huge amount of data, some sections
have upto 500MB of data, while testing bulk-sync scenario I have observed
that performance is very poor.



Steps (active-standby model):

1.       Start active node and  checkpoint 500MB of data

2.       Start standby node



In 2nd step data is synced from active to standby node during
saCkptCheckpointOpen() call, after this application reads data from
checkpoint database(10MB at a time) using saCkptCheckpointRead() function
call and deposits data to application so that application on standby node
is in same state as active. We have observed that saCkptCheckpointRead()
call takes lot of time(increases exponentialy? If the total section size is
>= 400MB)



Any reasoning/performance test results available for checkpoint read/write
call?



How is checkpoint data transferred between osafckptnd process and
application? Is it that agent and osafckptnd share a common shared memory?



Regards,

Girish

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