On Sun, 01 Feb 2009 14:41:37 -0500, "Bill Davidsen" <davidsen@xxxxxxx> said: > whollygoat@xxxxxxxxxxxxxxx wrote: > > On Sat, 31 Jan 2009 10:38:22 +0000, "David Greaves" <david@xxxxxxxxxxxx> > > said: > > > >> whollygoat@xxxxxxxxxxxxxxx wrote: > >> > >>> On a boot a couple of days ago, mdadm failed a disk and > >>> started resyncing to spare (raid5, 6 drives, 5 active, 1 > >>> spare). smartctl -H <disk> returned info (can't remember > >>> the exact text) that made me suspect the drive was > >>> fine, but the data connection was bad. Sure enough the > >>> data cable was damaged. Replaced the cable and smartctl > >>> sees the disk just fine and reports no errors. > >>> > >>> - I'd like to readd the drive as a spare. Is it enough > >>> to "mdadm --add /dev/hdk" or do I need to prep the drive to > >>> remove any data that said where it previously belonged > >>> in the array? > >>> > >> That should work. > >> Any issues and you can zero the superblock (man mdadm) > >> No need to zero the disk. > >> > > > > Would --re-add be better? > > > > > I don't think do. And I would zero the superblock. The more detail you > put into preventing unwanted autodetection the fewer learning > experiences you will have. Can anyone provide any more insight with the below? fly:~# mdadm --zero-superblock /dev/hdk1 mdadm: Unrecognised md component device - /dev/hdk1 fly:~# fdisk -l /dev/hdk Disk /dev/hdk: 120.0 GB, 120034123776 bytes 255 heads, 63 sectors/track, 14593 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hdk1 1 14593 117218241 da Non-FS data fly:~# mdadm -a /dev/hdk1 mdadm: /dev/hdk1 does not appear to be an md device fly:~# smartctl -a /dev/hdk smartctl version 5.36 [i686-pc-linux-gnu] Copyright (C) 2002-6 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF INFORMATION SECTION === Model Family: Western Digital Caviar SE family Device Model: WDC WD1200JB-00GVC0 Serial Number: WD-WCALA2237663 Firmware Version: 08.02D08 User Capacity: 120,034,123,776 bytes Device is: In smartctl database [for details use: -P show] ATA Version is: 6 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Mon Feb 2 16:50:13 2009 PST SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x82) Offline data collection activity was completed without error. Auto Offline Data Collection: Enabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: (3472) seconds. Offline data collection capabilities: (0x7b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. No General Purpose Logging support. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 49) minutes. Conveyance self-test routine recommended polling time: ( 5) minutes. SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000b 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0007 126 122 021 Pre-fail Always - 4200 4 Start_Stop_Count 0x0032 100 100 040 Old_age Always - 680 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x000b 200 200 051 Pre-fail Always - 0 9 Power_On_Hours 0x0032 085 085 000 Old_age Always - 10951 10 Spin_Retry_Count 0x0013 100 100 051 Pre-fail Always - 0 11 Calibration_Retry_Count 0x0013 100 100 051 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 677 194 Temperature_Celsius 0x0022 112 094 000 Old_age Always - 35 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0012 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0012 200 200 000 Old_age Always - 0 199 UDMA_CRC_Error_Count 0x000a 200 253 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0009 200 200 051 Pre-fail Offline - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed without error 00% 10922 - SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. Thanks, wg -- whollygoat@xxxxxxxxxxxxxxx -- http://www.fastmail.fm - The way an email service should be -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
