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Home -> Community -> Mailing Lists -> Oracle-L -> Sizing - RAC, storage subsystem EMC
Hi all, hope you can give some input ideas.
I am in the process of designing a system for a client of ours for a proposal
The sizing information I have been given is as follows.
58.1 million tickets/day at 351 bytes per record. The record was complete
populated (all columns filled to max) in a table and then analyzed. Average
row size 351 bytes.
=~ 19 GB/day. Raw data. Plus overhead (indexes, temp space, rollback, some
other data etc) here and there I have requested 5 TB.
We need to keep records for a month. Table design I am looking at is a date partition with a second level hash partition. This is so that I can move data in the oldest week/table space off line and write them to optical storage for possible retrieval at a later date (requirement).
Of course this will be on locally managed table spaces with auto storage management for segments.
Hardware:
The database will be a Oracle RAC 9.2.0.4 on Sun cluster 3 build on 2 x Sun
StarFire V880, 4 CPU's, 4 GB RAM each,
Connected to an EMC SAN via Fiber Channel
I do not have more information about the EMC array at the moment. Hitachi has been mentioned. (excuse the spelling)
Question I have.
I have been asked how many writes the Database will be doing to the SAN per
second.
I have determined that I should expect about 2000 tickets/second.
The table in question will have 2 indexes.
Now following rough guessing I said I should expect at least 16 000 writes/second
This was done by say/assuming
2 writes for the redo log files (2 members)
2 writes for the control files (2 control files)
2 writes to index blocks
1 write to undo table space block
1 write to table block for data
total 8 blocks written to per ticket.
Now I know the above is a real rough. And probably very wrong, if someone can shed some more light on it and give me a more accurate method/guess I would appreciate it.
Another question.
The hardware SAN engineers are telling me they want to configure the SAN in
a RAID 5 configuration. I have requested Raid 0 + 1. They say this is going
to be to expensive and the new technology allows them to give me the
performance I want using RAID 5.
I would prefer to err on the side of caution and follow Oracle industry wide recommendation and follow the SAME methodology. Comment.
Thx.
George
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