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1607
July 24th, 2015 10:00
Write Activity During Replication
I'm trying to determine how much data will be written to disk during normal replication. Consider the following scenario:
- Source Storage = 1MB Write
- Source RPA = 1MB Write (or does this write not actually go to disk but stay in memory?)
- Target RPA = 1MB Write (or does this write not actually go to disk but stay in memory?)
- Target Storage = 1MB Write
- Target Journal = 1MB Write
Is this understanding correct? Please correct if it's wrong. Thanks.
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fadliz
153 Posts
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July 24th, 2015 12:00
Hi -
So assuming 1 MB is intercepted by the Splitter and sent to the source RPA, the RPA receives the write and applies any link policies (Write folding, compression, dedup), then the RPA transfers this write (along w/ other writes part of the snapshot - which also has a configurable granularity, default is Dynamic) to the remote RPA. Once the remote RPA receives the write(s), it writes it to a stream in the copy Journal called the DO stream. It then reads it from the DO stream to memory and also reads the data from the actual replica and writes it to the undo stream, finally the write is written to the actual replica. This is a normal 5-phase distribution.
Hope that helps.
-Zahid
RP Corp Sys Eng.
DrWhy1
10 Posts
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July 24th, 2015 13:00
Thanks Sahid, however, I'm still unclear on where the writes occur. Can you please be more definitive in your description. Writing it out step by step in the same format I did above would help.
echolaughmk
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522 Posts
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July 25th, 2015 05:00
This should help DrWhy - check out the RecoverPoint Admin Guide...it will detail all of the write flows in different scenarios. This illustrates the normal distribution phase that Zahid talks about above.