Hi, I'm using EV10 SP3, Exchange 2010. We have 2 EV servers, one journaling one for users mailboxes, with separate SQL 2008 server. Last night we enabled 100 people in EV, the first of our pilot groups. We forced an archive run at 4pm which finished at 12:30am. Over that period it archived 416,000 items. Looking at the SAN utilisation, everything went along ok until 8pm-12am when for some reason MSMQ went crazy and spiked for 4 hours (see pic). The other luns continued on at around 50-100 I/O throughout the period, but MSMQ went to 900. What could cause this behaviour?
(The pic shows MSMQ in red, index (blue), partition (green), and SQL database (dark blue) and Logs (magenta) volumes)