Sorry, I sent this from the wrong email address, so it didn't make it to the list.<div><br></div><div>I have 2 WD Caviar Green, on which I run RAID1, that I bought to be a matched pair. But they have surprisingly different values on a few SMART parameters. Turns out they're actually different models (which may not be a bad thing).<br>
<div class="gmail_quote"><br>sda doesn't have the problem that Hugh cites, but sdb appears too.... it looks like it's had over a million load cycles!!<br><br>The <a href="https://ata.wiki.kernel.org/index.php/Known_issues#Drives_which_perform_frequent_head_unloads_under_Linux" target="_blank">https://ata.wiki.kernel.org/index.php/Known_issues#Drives_which_perform_frequent_head_unloads_under_Linux</a> page suggests that hdparm won't let you do a -B, and sure enough, I get:<br>
HDIO_DRIVE_CMD failed: Input/output error<br> APM_level<span style="white-space:pre-wrap"> </span>= not supported<br><br>I don't have any windows machines to run the <span style="line-height:19.049999237060547px;font-size:13px;font-family:sans-serif">wdidle3.exe tool that the web page suggests. Any suggestions?</span><br>
<font face="sans-serif"><span style="line-height:19.03999900817871px"><br></span></font><span style="font-family:sans-serif;font-size:13px;line-height:19.049999237060547px">Thanks ../Dave</span><br><font face="sans-serif"><span style="line-height:19.03999900817871px"><br>
</span></font><span style="font-family:sans-serif;font-size:13px;line-height:19.049999237060547px">---------- diff between my 2 drives ------------------</span><br>: ~ ; sudo smartctl -a /dev/sda >a;sudo smartctl -a /dev/sdb >b<br>
: ~ ; diff a b|less<br><br>5,9c5,9<br>< Model Family: Western Digital Caviar Green<br>< Device Model: WDC WD10EADS-00L5B1<br>< Serial Number: WD-WCAU4D967763<br>< LU WWN Device Id: 5 0014ee 2ae3e526b<br>
< Firmware Version: 01.01A01<br>---<br>> Model Family: Western Digital Caviar Green (Adv. Format)<br>> Device Model: WDC WD10EARS-00Z5B1<br>> Serial Number: WD-WMAVU1357829<br>> LU WWN Device Id: 5 0014ee 001df0c15<br>
> Firmware Version: 80.00A80<br>30c30<br>< data collection: (23400) seconds.<br>---<br>> data collection: (27480) seconds.<br>51,52c51<br>< SCT capabilities: (0x303f) SCT Status supported.<br>
< SCT Error Recovery Control supported.<br>---<br>> SCT capabilities: (0x3031) SCT Status supported.<br>60,61c59,60<br>< 3 Spin_Up_Time 0x0027 165 160 021 Pre-fail Always - 6741<br>
< 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 104<br>---<br>> 3 Spin_Up_Time 0x0027 181 179 021 Pre-fail Always - 5916<br>> 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 74<br>
64,70c63,69<br>< 9 Power_On_Hours 0x0032 067 067 000 Old_age Always - 24502<br>< 10 Spin_Retry_Count 0x0032 100 100 000 Old_age Always - 0<br>< 11 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 0<br>
< 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 102<br>< 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 11<br>< 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 104<br>
< 194 Temperature_Celsius 0x0022 114 103 000 Old_age Always - 36<br>---<br>> 9 Power_On_Hours 0x0032 075 075 000 Old_age Always - 18713<br>> 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0<br>
> 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0<br>> 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 72<br>> 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 17<br>
> 193 Load_Cycle_Count 0x0032 001 001 000 Old_age Always - 1140809<br>> 194 Temperature_Celsius 0x0022 <a href="tel:113%20%C2%A0%20103%20%C2%A0%20000" value="+13103000" target="_blank">113 103 000</a> Old_age Always - 37<br>
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