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Air Products SAP ERP configuration

MetaVolume shown to OS as LUN/Volume

Now imagine Transaction Log writes into MetaVolume in combination with EMC SRDF/S (synchronous Storage Replication)

Write of e.g. 15KB into T-Log file on Metavolume below

EMC SRDF/S lock down whole 960KB stripe during Replicating the 15KB changes

Second T-Log Write immediately afterwards highly likely touching same 960KB Block will be blocked for time of replication of first change

DBA-416M• ISV configurations & implementations – Lessons Learned

1. Tlog-Write

2. Tlog-Write

Blocked for changes until changes got replicated

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