Wednesday, January 18, 2012

Exchange Transaction logs - capacity planning

Sumatra's enterprise customers ask me how much space they should allocate for transaction logs.  I came across Ross Smith's Technet post.  Ross suggests a formula to compute the transaction logfile growth:

For ever 100 messages, Exchange generates 20 transation logs.
According to another Technet article, "Understanding Mailbox Database and Log Capacity,"  each transaction log is 2MB.

All calendaring transactions are messages.  Thus, to estimate the logfile size (in MB), sum the total number of transactions (generated through a macro in the Sumatra DB, M_ShowCounts) and multiply by (2/100).

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