This is current/adm64 on a PC (dmesg below). I monitor disk status with atactl. On one of the disks, I get this:
# atactl sd2 identify Model: WDC WD3200AAJS-00VWA0, Rev: 12.01B02, Serial #: WD-WMARW0118535 Device type: ATA, fixed Cylinders: 16383, heads: 16, sec/track: 63, total sectors: 625142448 Device capabilities: ATA standby timer values IORDY operation IORDY disabling Device supports the following standards: ATA-1 ATA-2 ATA-3 ATA-4 ATA-5 ATA-6 ATA-7 ATA-8 Master password revision code 0xfffe Device supports the following command sets: NOP command READ BUFFER command WRITE BUFFER command Host Protected Area feature set Read look-ahead Write cache Power Management feature set Security Mode feature set SMART feature set Flush Cache Ext command Flush Cache command Device Configuration Overlay feature set 48bit address feature set Automatic Acoustic Management feature set Set Max security extension commands Set Features subcommand required Power-up in standby feature set DOWNLOAD MICROCODE command SMART self-test SMART error logging Device has enabled the following command sets/features: NOP command READ BUFFER command WRITE BUFFER command Host Protected Area feature set Read look-ahead Write cache Power Management feature set SMART feature set Flush Cache Ext command Flush Cache command Device Configuration Overlay feature set 48bit address feature set Automatic Acoustic Management feature set Set Features subcommand required DOWNLOAD MICROCODE command # atactl sd2 readattr Attributes table revision: 16 ID Attribute name Threshold Value Raw 1 Raw Read Error Rate 51 199 0x0000000309c6 3 Spin Up Time 21 157 0x000000001405 4 Start/Stop Count 0 100 0x0000000002b7 5 Reallocated Sector Count 140 200 0x000000000000 7 Seek Error Rate 51 200 0x000000000000 9 Power-On Hours Count 0 76 0x000000004660 10 Spin Retry Count 51 100 0x000000000000 11 Calibration Retry Count 51 100 0x000000000000 12 Device Power Cycle Count 0 100 0x0000000001ec 192 Power-Off Retract Count 0 200 0x000000000124 193 Load Cycle Count 0 200 0x0000000002b7 194 Temperature 0 105 0x00000000002a 196 Reallocation Event Count 0 200 0x000000000000 197 Current Pending Sector Count 0 200 0x00000000000a 198 Off-Line Scan Uncorrectable Sect 0 200 0x000000000003 199 Ultra DMA CRC Error Count 0 200 0x00000000001d 200 *Write Error Rate 51 1 0x00000000b290 One or more threshold values exceeded! # atactl sd2 smartstatus No SMART threshold exceeded Either some threshold was exceeded or it wasn't: am I missing some subtle semantics here? Jan