Drives won't spin down

For the last several weeks, every drive in my array has been spinning. I've made no setup changes for quite a while, so I'm not sure what the issue is.

I have SAB, SB, & CP installed to my cache drive.

I run torrents, but they are all feeding to/from the newest disk (not many old things are being seeded).

Running these two commands:

/usr/bin/lsof |grep "/mnt/user"
/usr/bin/lsof |grep "/mnt/disk"

Reveal only a few files open on my data drives.

I'm running cache_dirs, so that should eliminate spinning disks up for directory listings.

I've confirmed that the system default spin-down is 1 hour and that all disks are using the system default

I noticed that it's set to use spin-up groups, and that most of the drives are in their own spin-up group (a few are set to 'blank').

I can manually spin down disks, and they will stop, but within a couple of minutes, they spin up again.

I'd include a syslog, but I have three, syslog, syslog.1, syslog.2 and they're dated on 5 Aug, 6 Aug & 15 Aug. It seems that log rotation isn't working properly, either.

Version: 5.0.4

Uptime: 132 days, 8 hours, 55 minutes

I'm sure I should update to 5.0.6 (copy bzimage and bzroot to the root of my flash drive & restart the server, right?). Any other tips or suggestions?

Thanks,

FreeMan