Experimental Physics and
Industrial Control System

<[email protected]> · Fri, 1 Oct 2010 12:38:45 +0100

I'm going to answer my own question after reading the manual in more
detail. The archiver writes a special 'archiver stopped' sample using
the server's timestamp before shutdown. If your PV hasn't updated before
the server restarts, then your first sample will have a timestamp
earlier than the last sample of the previous block.

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of 
> [email protected] 
> Sent: 01 October 2010 10:54
> To: [email protected]
> Subject: Channel Archiver overlapping blocks
> 
> Hi
> 
> Does anyone have experience with overlapping blocks appearing 
> in the Rtree Channel Archiver? 
> 
> Our archive engine restarts each week. For a channel, 
> sometimes the first sample in the new week's archive has the 
> same timestamp and value as the first sample in the previous 
> week's archive, after that the samples are correct. This is 
> not related to the IOC timestamps as it happens across many 
> channels. We do connect through the gateway but I'm not aware 
> of a gateway bug that could cause this.
> 
> Previous week  SSSSSSSSSSS
> New week       S____________SSSSSSSSS
> 
> James
> 
> [jr76@pc0053 archiver_indexer]$
> ~/archiver/trunk/bin/linux-x86/ArchiveDataTool -verbose \
> 3 /extra1/index/archiver1/raid1/PS/2010/06_09/index -blocks 
> -channel LI-PS-VAULT-01:SRCH\ COUNT RTree M for channel 
> 'LI-PS-VAULT-01:SRCHCOUNT': 50 Datablocks for channel 
> 'LI-PS-VAULT-01:SRCHCOUNT':
> '20100609' @ 0xB4E6ED: Indexed range 06/08/2010 
> 09:46:37.516254210 - 06/16/2010 07:15:30\ .669380000
> 
> 1 data blocks, 0 hidden blocks, 1 total
> 
> [jr76@pc0053 archiver_indexer]$
> ~/archiver/trunk/bin/linux-x86/ArchiveDataTool -verbose \
> 3 /extra1/index/archiver1/raid1/PS/2010/06_16/index -blocks 
> -channel LI-PS-VAULT-01:SRCH\ COUNT RTree M for channel 
> 'LI-PS-VAULT-01:SRCHCOUNT': 50 Datablocks for channel 
> 'LI-PS-VAULT-01:SRCHCOUNT':
> '20100616' @ 0xBC0B10: Indexed range 06/08/2010 
> 09:46:37.516254210 - 06/17/2010 10:26:40\ .334905070
> 
> 1 data blocks, 0 hidden blocks, 1 total
> 
> 
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System