I have an older Pro Business edition and a newer Pro6 that sit next to each other with enough space in between for air circulation. The system fan on the Pro 6 often runs much faster than on the Pro. This is especially noticeable after a file system consistency check, backup job, or something else that's disk intensive has been performed and nothing else has happened since. I understand why this woulod be true during or very soon after the intensive activity, but here are the statuses 14 hours following a file system consistency check:
Health status when I started this message:
Device Description Status Disk 1 Seagate ST2000DL003-9VT166 1863 GB , 26 C / 78 F , Write-cache ON OK Disk 2 Seagate ST2000DL003-9VT166 1863 GB , 25 C / 77 F , Write-cache ON OK Disk 3 Seagate ST2000DL003-9VT166 1863 GB , 26 C / 78 F , Write-cache ON OK Disk 4 Seagate ST2000DL003-9VT166 1863 GB , 26 C / 78 F , Write-cache ON OK Disk 5 Hitachi HDS722020ALA330 1863 GB , 27 C / 80 F , Write-cache ON OK Disk 6 Hitachi HDS722020ALA330 1863 GB , 27 C / 80 F , Write-cache ON OK Fan SYS 1776 RPM OK Fan CPU 2083 RPM OK Temp SYS 46 C / 114 F [Normal 0-65 C / 32-149 F] OK Temp CPU 24.5 C / 76 F [Normal 0-85 C / 32-185 F] OK UPS 1 Remote CPS CP 1500C, Battery charge: 100%, 13 minutes OK
Health status now:
Device Description Status Disk 1 Seagate ST2000DL003-9VT166 1863 GB , 34 C / 93 F , Write-cache ON OK Disk 2 Seagate ST2000DL003-9VT166 1863 GB , 33 C / 91 F , Write-cache ON OK Disk 3 Seagate ST2000DL003-9VT166 1863 GB , 33 C / 91 F , Write-cache ON OK Disk 4 Seagate ST2000DL003-9VT166 1863 GB , 34 C / 93 F , Write-cache ON OK Disk 5 Hitachi HDS722020ALA330 1863 GB , 37 C / 98 F , Write-cache ON OK Disk 6 Hitachi HDS722020ALA330 1863 GB , 36 C / 96 F , Write-cache ON OK Fan SYS 942 RPM OK Fan CPU 2136 RPM OK Temp SYS 55 C / 131 F [Normal 0-65 C / 32-149 F] OK Temp CPU 28.5 C / 83 F [Normal 0-85 C / 32-185 F] OK UPS 1 Remote CPS CP 1500C, Battery charge: 100%, 14 minutes OK
And here is the older Pro BE:
Device Description Status Disk 1 Hitachi HDS722020ALA330 1863 GB , 40 C / 104 F , Write-cache ON OK Disk 2 Hitachi HDS722020ALA330 1863 GB , 41 C / 105 F , Write-cache ON OK Disk 3 Hitachi HDS722020ALA330 1863 GB , 39 C / 102 F , Write-cache ON OK Disk 4 Hitachi HDS722020ALA330 1863 GB , 39 C / 102 F , Write-cache ON OK Disk 5 Hitachi HDS722020ALA330 1863 GB , 39 C / 102 F , Write-cache ON OK Disk 6 Hitachi HDS722020ALA330 1863 GB , 38 C / 100 F , Write-cache ON OK Fan SYS 942 RPM OK Fan CPU 2109 RPM OK Temp SYS 58 C / 136 F [Normal 0-65 C / 32-149 F] OK Temp CPU 25.5 C / 77 F [Normal 0-60 C / 32-140 F] OK UPS 1 Remote CPS CP 1500C, Battery charge: 100%, 14 minutes OK
The system and drive temperatures on the Pro6 are warmer now, which you would expect with the fan running slower, but why did it think it needed to still run the fan faster and attain those lower temperatures well after the intensive disk activity was completed? The Pro BE is happy with a low fan speed with even higher disk and system temperatures. The system fan was up over around 2000 RPM when I first came into the room, but I didn't get a snapshot of that. Why did I have to wake it up by accessing FrontView for it to return to normal fan speeds? The Pro BE doesn't seem to do this. Then again, the Pro6 is mostly just a backup of the Pro BE and the Pro BE is accessed nightly by three different computers that do their backups to it, so maybe the backups are serving to wake up the Pro BE and get it to adjust the fan speed based on the temperatures while nothing does the same for the Pro6. Perhaps this is a bug, that the fan speed adjustment doesn't run when the drives are spun down? And does it work the opposite as well? If my A/C failed, would it fail to increase the fan speed as the system got warmer?
The CPU temp on the Pro6 does run a bit warmer, which I attribute to my having replaced the CPU on the BE, putting in some Artic Silver thermal compound in the process, while the 6 is still stock CPU (since it came with a faster one). Both are equipped with 2048 MB [4-5-5-15 DDR2] (stock on the BE, upgrade on the 6). Both run RAIDiator 4.2.26.
OK, so it's not just the Pro6. I just "caught" my Pro BE doing the same thing. Drive, system, and CPU temperatures well within normal range but system fan at 2280RPM. Just as soon as I looked at the health status to check the RPM's, the fan started dropping speed in steps and is now down to 932. The unit completed RAID scrubbing some 20 hours ago, but probably hasn't been accessed since. I just updated my firmware to 4.2.26 (from 4.2.21) about a month ago, and I never saw this kind of thing before that (except, of course, when activity or room temperature drove up the temperatures). I had stuck with the older version because of problems that arose with the dreaded Seagate ST2000DL003's with 4.2.22 and I finally decided to see if the latest was working with them (so far, so good). So I don't know if this is new in 4.2.26 or snuck in earlier.
