Exchange Q&A with David Elfassy

David Elfassy IM’d me yesterday and asked me to play a game of word association. I hate word associations. It seems that word associations always lead to people thinking I am insane, and I get locked in padded rooms.


Anyways, he said it would really help him with some Exchange materials that he is working on, so I agreed.


David: SAN optimization. (First word that comes to your mind)

Russ: Banana (I was hungry and was reaching for a banana)


David: You *&(%$__*(&*(@#** – (wow, that was rude)  🙂

Russ: Cheerios (what else do you say to that?)


Note: at this point, I could already hear the ambulance and the guys in white suits coming to take me away.


David: SAN optimization.

Russ: diskpar, multipathing (see the link for Rod Fournier’s diskpar blog, and see  on the Exchange team blog on the same subject here)


David: SAN availability

Russ: Multipathing, SAN replication, geo clustering


David: Transaction log performance on SAN’s

Russ: disable write back cache for the LUN if possible, provide a separate LUN, RAID 1 within the SAN

Note: David asked me to explain why I did not say anything about RAID 10 or 0+1. I told him that I can’t see throwing that much at a transaction log unless you really have huge amounts of transactions that require scaling up the size of the log space to hold a large size.

David: iSCSI for Exchange

Russ: Interesting solution, not near the I/O achievable via a SAN with multipathing, though. Must use a dedicated gig/e network to achieve best performance.


David: WIndows Storage Server with NAS for small orgs

Russ: Good solution depending on size of org. Again, not near the I/O of an inexpensive SAN device and should again have a dedicated gig/e network for the connection.

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