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Re: Hitachi SMART status temps are way wrong

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John Davidson
Re: Hitachi SMART status temps are way wrong
on Feb 2, 2012 at 2:21:14 am

My understanding is that the ATTO cards are supposed to crank up the internal fans to full blast to compensate for the lack of on board fan. My issue is related to drives in a RAID 5 ProAvio enclosure. As we had a second room with WD drives and a second identical 8MS enclosure, this is what we've done to isolate the issue:

1. Swapped enclosures. It's not a faulty enclosure issue, drives still claim to be hot.
2. Plugged the RAID into a R380 card. Drives still look hot ( ATTO Config SMART says 211 degrees on some drives, even when cold).
3. Swapped drives with 2Tb WD Caviar Black into the R680, all chilling at a nice 111 degrees. It's not an ATTO issue.

At best I can isolate the issue to being specific to how Hitachi Drives report SMART status temperature, as in real life they are not hot. With this in mind, I'm just disabling SMART status monitoring, as it seems to be only really good at giving incorrect information.

We just got two new drives in. I'll be removing the drive claiming to be the hottest and rebuilding the array tonight. With a little luck, we'll be back to nice even read / write lines and can move on to deal with other looming disasters.

John Davidson | President / Creative Director | Magic Feather Inc.

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