Complex cooked/raw value dependency of attribute 5 on Hitachi Deskstar T7K250
Dan Lukes <[email protected]>
| Newsgroups | gmane.linux.utilities.smartmontools |
|---|---|
| Message-ID | <[email protected]> |
Note this is neither bug report nor question. It's report about surprising behavior of Hitachi's SMART. ------------ I received disc affected by "unreadable sectors issue" causing the disk can't be mounted (broken filesystem, unable to repair because of unreadable sectors). For this kind of issues I compiled my own utility to refresh the affected disc. It read all disc sectors and write back all those considered unreadable or suspicious (I'm trying to catch recoverable read errors as well). Write should trigger internal relocation of broken sector causing there will be o unreadable sector at user level visible. Don't hesitate, I need no help with such task, it works like a charm. I'm writing here because I monitored the SMART attributes during the refresh process and I got some result I would like to share. The initial values as well as snaps of selected atributes are on bottom. It revealed that this disc/firmware doesn't save worst values. Cooked value and worst value is same all the times - despite cooked value has increased. The exception is the attribute 199, it seems the WORST value is constant and unrelated to value at all. Well, it is noticeable "feature", but what's surprising me more is the relationship of RAW and COOKED value of attribute 5. Despite raw value of attribute 5 has increased monotonically during the refresh (expected behavior), the cooked value increased for a while before it start to descend (unexpected behavior by me). Yes, I'm aware that exact meaning of RAW value is vendor specific - and even meaning of cooked value is not defined. Despite of it I can be surprised by particular behavior, isn't it ? OK. There's no conclusion from such test. Just recorded values and behavior of particular disc. Someone may consider it interesting despite the true value of this information is rather questionable ;-) Regards Dan ------------------------------------------------------------- Model Family: Hitachi Deskstar T7K250 Device Model: HDT722525DLA380 Firmware Version: V44OA96A User Capacity: 250,059,350,016 bytes [250 GB] SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE 1 Raw_Read_Error_Rate PO-R-- 084 084 016 - 11600063 2 Throughput_Performance P-S--- 100 100 050 - 0 3 Spin_Up_Time POS--- 106 106 024 - 325 4 Start_Stop_Count -O--C- 100 100 000 - 78 5 Reallocated_Sector_Ct PO--CK 005 005 005 NOW 1592 7 Seek_Error_Rate PO-R-- 100 100 067 - 0 8 Seek_Time_Performance P-S--- 138 138 020 - 30 9 Power_On_Hours -O--C- 090 090 000 - 75364 10 Spin_Retry_Count PO--C- 100 100 060 - 0 12 Power_Cycle_Count -O--CK 100 100 000 - 78 192 Power-Off_Retract_Count -O--CK 099 099 050 - 1203 193 Load_Cycle_Count -O--C- 099 099 050 - 1203 194 Temperature_Celsius -O---- 141 141 000 - 39 (Min/Max 18/64) 196 Reallocated_Event_Count -O--CK 015 015 000 - 1621 197 Current_Pending_Sector -O---K 098 098 000 - 206 198 Offline_Uncorrectable ---R-- 100 100 000 - 0 199 UDMA_CRC_Error_Count -O-R-- 200 253 000 - 0 ------------------------------------------------------------- Snapshots of selected attributes during disk refresh process. ------------------------------------ 5 Reallocated_Sector_Ct PO--CK 005 005 005 NOW 1598 196 Reallocated_Event_Count -O--CK 015 015 000 - 1630 197 Current_Pending_Sector -O---K 098 098 000 - 202 5 Reallocated_Sector_Ct PO--CK 005 005 005 NOW 1602 196 Reallocated_Event_Count -O--CK 013 013 000 - 1635 197 Current_Pending_Sector -O---K 098 098 000 - 197 5 Reallocated_Sector_Ct PO--CK 005 005 005 NOW 1614 196 Reallocated_Event_Count -O--CK 013 013 000 - 1648 197 Current_Pending_Sector -O---K 100 100 000 - 187 5 Reallocated_Sector_Ct PO--CK 006 006 005 - 1632 196 Reallocated_Event_Count -O--CK 012 012 000 - 1669 197 Current_Pending_Sector -O---K 100 100 000 - 143 5 Reallocated_Sector_Ct PO--CK 006 006 005 - 1644 196 Reallocated_Event_Count -O--CK 011 011 000 - 1685 197 Current_Pending_Sector -O---K 100 100 000 - 126 5 Reallocated_Sector_Ct PO--CK 007 007 005 - 1647 196 Reallocated_Event_Count -O--CK 011 011 000 - 1690 197 Current_Pending_Sector -O---K 100 100 000 - 117 5 Reallocated_Sector_Ct PO--CK 006 006 005 - 1655 196 Reallocated_Event_Count -O--CK 010 010 000 - 1698 197 Current_Pending_Sector -O---K 100 100 000 - 112 5 Reallocated_Sector_Ct PO--CK 006 006 005 - 1669 196 Reallocated_Event_Count -O--CK 009 009 000 - 1712 197 Current_Pending_Sector -O---K 100 100 000 - 105 5 Reallocated_Sector_Ct PO--CK 006 006 005 - 1671 196 Reallocated_Event_Count -O--CK 009 009 000 - 1714 197 Current_Pending_Sector -O---K 100 100 000 - 103 5 Reallocated_Sector_Ct PO--CK 006 006 005 - 1684 196 Reallocated_Event_Count -O--CK 009 009 000 - 1728 197 Current_Pending_Sector -O---K 100 100 000 - 94 5 Reallocated_Sector_Ct PO--CK 006 006 005 - 1701 196 Reallocated_Event_Count -O--CK 008 008 000 - 1746 197 Current_Pending_Sector -O---K 100 100 000 - 83 5 Reallocated_Sector_Ct PO--CK 005 005 005 NOW 1740 196 Reallocated_Event_Count -O--CK 005 005 000 - 1791 197 Current_Pending_Sector -O---K 100 100 000 - 50 5 Reallocated_Sector_Ct PO--CK 005 005 005 NOW 1780 196 Reallocated_Event_Count -O--CK 003 003 000 - 1840 197 Current_Pending_Sector -O---K 100 100 000 - 50 5 Reallocated_Sector_Ct PO--CK 005 005 005 NOW 1797 196 Reallocated_Event_Count -O--CK 001 001 000 - 1877 197 Current_Pending_Sector -O---K 100 100 000 - 3 5 Reallocated_Sector_Ct PO--CK 004 004 005 NOW 1806 196 Reallocated_Event_Count -O--CK 001 001 000 - 1886 197 Current_Pending_Sector -O---K 100 100 000 - 1 ------------------------------------ ------------------------------------------------------------------------------ Don't Limit Your Business. 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