[opensuse] SMART Attribute 194 Temperatures -- Reliable?
Listmates, How accurate are the SMART Attribute 194 Temperatures? I ask because I have 2 drives that are reporting at, or over, 160 C (161 C = 321.8 F). However, the drives are just warm to the touch, not Hot at all. If the drives were really hot enough to cook a roast, I would expect the outside of the drive to be at least "hot to the touch". With the case open, I can rest my hands on the driver without any discomfort, all the while, smart is reporting: Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sda, SMART Usage Attribute: 194 Temperature_Celsius changed from 161 to 166 Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sdb, SMART Usage Attribute: 194 Temperature_Celsius changed from 166 to 161 Anybody looked into this issue, or is SMART just OUT SMARTING itself? -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Thursday 24 April 2008 07:17, David C. Rankin wrote:
Listmates,
How accurate are the SMART Attribute 194 Temperatures? I ask because I have 2 drives that are reporting at, or over, 160 C (161 C = 321.8 F). However, the drives are just warm to the touch, not Hot at all. If the drives were really hot enough to cook a roast, I would expect the outside of the drive to be at least "hot to the touch". With the case open, I can rest my hands on the driver without any discomfort, all the while, smart is reporting:
I seem to recall something in SMART about how the reported values are biased in some cases. If the reporting program doesn't know the right bias, it displays incorrect values. It's a pretty vague recollection and probably not entirely accurate, but you can find mentions of it in various resources describing SMART.
Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sda, SMART Usage Attribute: 194 Temperature_Celsius changed from 161 to 166 Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sdb, SMART Usage Attribute: 194 Temperature_Celsius changed from 166 to 161
On my 10.0 system, the numbers report for degrees centigrade are plausible, on my 10.3 system, they're like the ones you show.
Anybody looked into this issue, or is SMART just OUT SMARTING itself?
-- David C. Rankin
Randall Schulz -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
hi! Am Donnerstag, 24. April 2008 16:17 schrieb David C. Rankin:
How accurate are the SMART Attribute 194 Temperatures? I ask because I have 2 drives that are reporting at, or over, 160 C (161 C = 321.8 F).
Are you sure those are the raw-values and not the calucated ones? Regards, Matthias -- Matthias Bach www.marix.org -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Matthias Bach wrote:
hi!
Am Donnerstag, 24. April 2008 16:17 schrieb David C. Rankin:
How accurate are the SMART Attribute 194 Temperatures? I ask because I have 2 drives that are reporting at, or over, 160 C (161 C = 321.8 F).
Are you sure those are the raw-values and not the calucated ones?
Regards, Matthias
They are whatever get logged in /var/log/messages, so I suspect they are the calculated ones. When I get time, I'll look into the not so smart calculation and see if I can find out where the miscalculation is. It almost looks like a 2X doubling of the actual temps. -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
David C. Rankin schrieb:
Matthias Bach wrote:
hi!
Am Donnerstag, 24. April 2008 16:17 schrieb David C. Rankin:
How accurate are the SMART Attribute 194 Temperatures? I ask because I have 2 drives that are reporting at, or over, 160 C (161 C = 321.8 F).
Are you sure those are the raw-values and not the calucated ones?
Regards, Matthias
They are whatever get logged in /var/log/messages, so I suspect they are the calculated ones. When I get time, I'll look into the not so smart calculation and see if I can find out where the miscalculation is. It almost looks like a 2X doubling of the actual temps.
There is also a bug regarding unclear smartd output: https://bugzilla.novell.com/show_bug.cgi?id=355119 Greetings -- Thomas Schmidt (tschmidt [at] suse.de) SUSE Linux Products GmbH :: Research & Development :: Tools "Don't Panic", Douglas Adams (1952 - 11.05.2001) -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
David C. Rankin wrote:
Listmates,
How accurate are the SMART Attribute 194 Temperatures? I ask because I have 2 drives that are reporting at, or over, 160 C (161 C = 321.8 F). However, the drives are just warm to the touch, not Hot at all. If the drives were really hot enough to cook a roast, I would expect the outside of the drive to be at least "hot to the touch". With the case open, I can rest my hands on the driver without any discomfort, all the while, smart is reporting:
Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sda, SMART Usage Attribute: 194 Temperature_Celsius changed from 161 to 166 Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sdb, SMART Usage Attribute: 194 Temperature_Celsius changed from 166 to 161
Anybody looked into this issue, or is SMART just OUT SMARTING itself?
These are 'normalized' values, within the range of 0-255. If you want more useful information, you need to look at smartctl -a /dev/sda and look for the RAW column.
Hi! Am Donnerstag 24 April 2008 schrieb Adam Schrotenboer:
These are 'normalized' values, within the range of 0-255. If you want more useful information, you need to look at smartctl -a /dev/sda and look for the RAW column.
Yes, and 255 is best, 0 is worst. There is usually a Threshold at ~100. Regards, Matthias -- Matthias Bach www.marix.org „Der einzige Weg, die Grenzen des Möglichen zu finden, ist ein klein wenig über diese hinaus in das Unmögliche vorzustoßen.“ - Arthur C. Clarke
Adam Schrotenboer wrote:
David C. Rankin wrote:
Listmates,
How accurate are the SMART Attribute 194 Temperatures? I ask because I have 2 drives that are reporting at, or over, 160 C (161 C = 321.8 F). However, the drives are just warm to the touch, not Hot at all. If the drives were really hot enough to cook a roast, I would expect the outside of the drive to be at least "hot to the touch". With the case open, I can rest my hands on the driver without any discomfort, all the while, smart is reporting:
Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sda, SMART Usage Attribute: 194 Temperature_Celsius changed from 161 to 166 Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sdb, SMART Usage Attribute: 194 Temperature_Celsius changed from 166 to 161
Anybody looked into this issue, or is SMART just OUT SMARTING itself?
These are 'normalized' values, within the range of 0-T255. If you want more useful information, you need to look at smartctl -a /dev/sda and look for the RAW column.
Ahah!, That makes more sense: 194 Temperature_Celsius 0x0002 161 161 000 Old_age Always - 34 (Lifetime Min/Max 15/45) The Raw value is 34. -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Thu, Apr 24, 2008 at 7:17 AM, David C. Rankin
Listmates,
How accurate are the SMART Attribute 194 Temperatures? I ask because I have 2 drives that are reporting at, or over, 160 C (161 C = 321.8 F). However, the drives are just warm to the touch, not Hot at all. If the drives were really hot enough to cook a roast, I would expect the outside of the drive to be at least "hot to the touch". With the case open, I can rest my hands on the driver without any discomfort, all the while, smart is reporting:
Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sda, SMART Usage Attribute: 194 Temperature_Celsius changed from 161 to 166 Apr 24 07:47:17 trinity smartd[3627]: Device: /dev/sdb, SMART Usage Attribute: 194 Temperature_Celsius changed from 166 to 161
Anybody looked into this issue, or is SMART just OUT SMARTING itself?
man 8 smartd.conf see the -v option where you can bias the readings to account for the various different way of reporting temps. See also http://download.savannah.nongnu.org/releases/hddtemp/hddtemp.db -- ----------JSA--------- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (6)
-
Adam Schrotenboer -
David C. Rankin -
John Andersen -
Matthias Bach -
Randall R Schulz -
Thomas Schmidt