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Memory requirements
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Basic memory configurations for each server role were discussed earlier in this chapter. One of the variables that makes sizing memory on the Mailbox server more complicated is the mailbox database cache. The mailbox database cache is the memory used to cache database I/O operations. Having ample mailbox database cache will minimize the required storage I/O. To estimate the mailbox database cache requirements, multiply the number of mailbox copies and the average I/O calculated for each mailbox and then multiply by 50 MB/IOP to obtain the amount of optimal database cache for the calculated user profile. For example: 2750 Mailboxes * 0.120 IOPS/Mailbox * 50 MB/IOPS = 16,500 MB.
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Fifty MB/IOp is calculated from performance guidelines published by Microsoft.
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For more information about the Exchange mailbox database cache and other ways to estimate the optimal mailbox database cache visit http://technet.microsoft.com/en-us/ library/ee832793.aspx.
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After determining the amount of mailbox database cache, you must determine the amount of physical memory required. To determine the amount of physical memory required to satisfy the mailbox database cache required use the information in Table 13-5.
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ChapTEr 13
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Hardware Planning for Exchange Server 2010
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TABLE 13-5 Exchange Mailbox Database Cache
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PHYSICAL MEMORY (GB)
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MAILBOX ROLE ONLY: MAILBOX DATABASE CACHE (GB)
MULTIPLE ROLE: MAILBOX DATABASE CACHE (GB)
4 8 16 24 32 48 64 96 128
1 3.6 10.4 17.6 24.4 39.2 53.6 82.4 111.2
Not Supported 2 8 14 20 32 44 68 92
To provide 16,500 MB of cache for the preceding example, according to the table the physical server should have 24 GB of memory to provide 17.6 GB of mailbox database cache. For more information about sizing memory for Exchange 2010 visit http://technet .microsoft.com/en-us/library/dd346700.aspx.
Storage requirements
Although many of these concepts are wrapped in the Mailbox Server Role Requirements Calculator, it is also important to understand how it calculates the requirements. One of the decisions that you need to make is whether you want to use a SAN, or direct attached storage (DAS). If you choose to use DAS, you also have the option of configuring storage as JBOD or with RAID protection. This decision should be made based on the level of redundancy in the Exchange configuration, operational maturity, and storage performance. For example if you already have a SAN in place and you plan to deploy a DAG, storing all database copies in the DAG on the SAN still has the SAN as a single point of failure. In some environments this may be an acceptable risk because of the redundancy for the SAN. On the other hand, a greater level of redundancy may be achieved at a lower cost by using a DAS solution with local RAID. If you have decided to use a DAS configuration and you have planned for at least three copies of each database, do you also need to have a RAID-configured storage system For a more thorough discussion of risk management and storage options, please see 11. Mailbox data stored on disk that is not equal to the amount of data that Outlook reports is stored inside a user s mailbox because there is some additional overhead. To estimate the maximum size a mailbox would consume on disk, add the mailbox limit and whitespace and the dumpster size. Whitespace is the transient data in the mailbox that may take up
Sizing Guidelines
ChapTEr 13
space temporarily on disk but is shortly deleted. Whitespace can be estimated to be roughly the size of messages sent and received each day. A user profile that sends and receives 100 messages a day with an average size of 100 KB each would have an estimated whitespace of about 10 MB. Calculating the size of the dumpster depends on the features enabled. Deleted item retention is figured simply by multiplying the average size of messages sent and received each day by the length of the retention period. If you enable Single Item Recovery, an additional 1.2 percent of the mailbox size needs to be added to the size on disk. If you leave calendar version logging enabled you must also add an additional 5.8 percent of the mailbox size. For a mailbox with a 1,024 MB limit that has roughly 10 MB of changes each day, a 21-day retention window, and Single Item Recovery, the size would be roughly 210 MB. Add to that 12.3 MB (1,024 MB mailbox limit 1.2 percent) for Single Item Recovery and 59.4 MB (1,024 MB mailbox limit 5.8 percent) for calendar version logging to estimate the dumpster to be 281.7 MB. The maximum size for the 1,024 MB mailbox in this scenario would be roughly 1,317 MB (1,024 MB mailbox limit + 10 MB whitespace + 281.7 MB dumpster) on disk.
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