Strange Jetstress 2010 results..?

Are you running the latest version of Jetstress 2010 against data created using the beta?  If so then you may see some very strange results because there are some minor updates from the beta version which mean that you cannot mix databases created using the beta version with tests run using the released version.  Either…

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3 into 4 can go…

Once you’ve determined the number of Exchange Server 2010 mailbox database copies you’re going to use it makes sense to deploy a complimentary number of mailbox servers in the DAG.  If you decide to go with an odd number of database copies go with an odd number of nodes; if you use an even number…

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1 AD Site, 1 DAG = no DAC

So as the TechNet article (Understanding Datacenter Activation Coordination Mode) explains you can’t enable DAC mode in Exchange Server 2010 for a DAG where all members are in the same AD site…  So what happens if you lose your primary data centre where your Witness Server is located and you do have a single DAG…

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CCR or SCC?

Have had this discussion on many occasions and this 3Sharp whitepaper by Missy Koslosky would have proved very useful as an external reference point… High Availability Choices for Exchange Server 2007: Continuous Cluster Replication or Single Copy Clustering In conclusion…  (this isn’t the only bit I read) “Exchange Server 2007 is a mission critical application….

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Why so much fluff?

When you use the Exchange 2007 Mailbox Storage Calculator on the face of it you seem to get a lot of fluff added to your storage design.  ..fluff upon fluff. Will run through some of the reasoning where it may not seem obvious in the cell comments themselves. LUN Free Space Percentage: couple of reasons…

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3 Data Centres and a File Share Witness

What’s the guidance if you’ve got 3 data centres, you’re stretching Exchange 2007 mailbox CCR nodes between two of them and the link speed and latencies are similar between all 3.  Should you put the File Share Witness (FSW) in the 3rd data centre? In my opinion yes I would recommend putting the FSW in…

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24 hour operation, several thousand mailboxes, high concurrency, heavy profiles – how do you tune Online Maintenance?

For companies who have to support a lot of ‘heavy usage’ clients connecting to their Exchange 2007 platform 24 hours a day, tuning online maintenance is going to be important.. You have to be quite careful about staggering online maintenance to minimise its impact on performance and it can be a bit of a juggling…

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Initializing Storage Groups…

This is a nice blog from Tim McMichael (a Microsoft Escalation Engineer)…  If you want to know why replicated storage groups sometimes appear to be initializing have a read. Get-storagegroupcopystatus = Initializing “When storage groups are in an initializing state commandlets report that action cannot be taken because replication is failed.  It really is not…

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Crossover cables and CCR…

So can you just use a crossover cable for private cluster communications between CCR (& SCC) nodes.  Well the answer, not very surprisingly, is yes; but there are a couple of caveats… Be careful and test the cable, especially if it’s a DIY job; And make sure you get speed and duplex settings right: “If…

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