Experimental Physics and
Industrial Control System

It is a hard disk performance issue rather than memory issue, that is our NFS disk for STS, MTS and LTS has slower write speed than the archiving speed, which causes some data fails to be stored. Sorry for the confusing title.

Actually, before this migration, I had a RAMDisk folder for STS, but I was too confident of our NFS disk performance and removed the RAMDisk for the migration, which caused the problem. Now after using RAMDisk for STS again, the data can be stored normally.

Regards,

Lin

-----原始邮件-----
发件人:"Wang, Lin" <wanglin at ihep.ac.cn>
发送时间:2023-02-14 12:45:28 (星期二)
收件人: tech-talk at aps.anl.gov
抄送:
主题: Archiver appliance sampling buffer overflows after migration from Version 2018 to Version 1.1.0

Dear all,

In the last several years, we used Archiver Appliance Version archappl_v0.0.1_SNAPSHOT_15-November-2018T10-27-25.tar.gz to arvhive PVs at CSNS office network.

Recently, we have upgrated Archiver Appliance to the latest Version 1.1.0 and preserve the existing MySQL database as well as archappl.properties.

However, with this latest version, some 25Hz high-frequency PVs with low archiving rate and SCAN archiving method cannot be archived continuously.

For example, the process frequency of PV A:B:C:D is 25Hz, the scan period is 1 second and the scan method is SCAN, the data can only be stored at the beginning of every 1 minute and then stop.

It seems that the sampling buffer overflows, but it did not happen for the old version. Did I miss something for the migration or is there anything changed in the latest version? Any suggestion is appreciated.

Regards,

Lin 

References:

Archiver appliance sampling buffer overflows after migration from Version 2018 to Version 1.1.0 Wang, Lin via Tech-talk

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