We found out where the extra space-usage was on the Exchange servers. Turns out the EXCHSRVR directories for the two halves of the exchange cluster are effectively identical.
We also found out that there was something like 35 GB going missing that wasn't turning up in the directory lists, but was showing as used at the disk-level. I hammered that thing, but couldn't dig it up. Until I reran checkdisk and actually paid attention to the drive stats, and noticed that BAD CLUSTERS was up around 32GB of space.
Whaaaaa? This is a SAN. That sort of thing shouldn't happen. We have something like three layers of error correction between the physical platter and the OS. Clearly the bad stuff wasn't in regular data our we'da heard about it by now. Because of how the striping happens, bad clusters like that should have completely shot the SAN to a smouldering glow. But the only signs of space like this is on this one Exchange server. My theory is that these got marked bad through some OS-level mistake, rather than actual bad stuff.
This will get closer inspection when we bring things up after the SAN update this Sunday. Wozers.
We also found out that there was something like 35 GB going missing that wasn't turning up in the directory lists, but was showing as used at the disk-level. I hammered that thing, but couldn't dig it up. Until I reran checkdisk and actually paid attention to the drive stats, and noticed that BAD CLUSTERS was up around 32GB of space.
Whaaaaa? This is a SAN. That sort of thing shouldn't happen. We have something like three layers of error correction between the physical platter and the OS. Clearly the bad stuff wasn't in regular data our we'da heard about it by now. Because of how the striping happens, bad clusters like that should have completely shot the SAN to a smouldering glow. But the only signs of space like this is on this one Exchange server. My theory is that these got marked bad through some OS-level mistake, rather than actual bad stuff.
This will get closer inspection when we bring things up after the SAN update this Sunday. Wozers.