Power-Management
為什麼使用 hdparm -S 時驅動器無法進入待機模式
閱讀
hdparm手冊頁時，它說-S值驅動器使用它來確定在關閉主軸電機以節省電力之前等待多長時間（沒有磁碟活動）
使用輸出配置我的驅動器時
hdparm -B 1 -K 1 -S 120 /dev/sd[d-z]：setting drive keep features to 1 (on) setting Advanced Power Management level to 0x01 (1) setting standby to 120 (10 minutes) APM_level = 1並且初始驅動狀態
hdparm -C /dev/sd[d-z]是“活動/空閒”。所有這些
/dev/sd[d-z]驅動器都使用相同的品牌和型號，未分區，未格式化且未安裝。等待 15 分鐘後，驅動狀態仍為“ active/idle ”。
只有當發出“強制 IDE 驅動器立即進入低功耗待機模式”
hdparm -y /dev/sd[d-z]時，驅動器才會進入“待機”狀態。為什麼我的硬碟在 hdparm 指定的超時值後沒有進入低功耗待機狀態？
更多驅動器規格源自
hdparm -I /dev/sdd/dev/sdd: ATA device, with non-removable media Model Number: Hitachi HDS5C3020BLE630 Firmware Revision: MZ4OAAB0 Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0; Revision: ATA8-AST T13 Project D1697 Revision 0b Standards: Used: unknown (minor revision code 0x0029) Supported: 8 7 6 5 Likely used: 8 Configuration: Logical max current cylinders 16383 16383 heads 16 16 sectors/track 63 63 -- CHS current addressable sectors: 16514064 LBA user addressable sectors: 268435455 LBA48 user addressable sectors: 3907029168 Logical Sector size: 512 bytes Physical Sector size: 4096 bytes Logical Sector-0 offset: 0 bytes device size with M = 1024*1024: 1907729 MBytes device size with M = 1000*1000: 2000398 MBytes (2000 GB) cache/buffer size = 22756 KBytes (type=DualPortCache) Form Factor: 3.5 inch Nominal Media Rotation Rate: 5700 Capabilities: LBA, IORDY(can be disabled) Queue depth: 32 Standby timer values: spec'd by Standard, no device specific minimum R/W multiple sector transfer: Max = 16 Current = 16 Advanced power management level: 1 DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=120ns IORDY flow control=120ns Commands/features: Enabled Supported: * SMART feature set Security Mode feature set * Power Management feature set * Write cache * Look-ahead * Host Protected Area feature set * WRITE_BUFFER command * READ_BUFFER command * NOP cmd * DOWNLOAD_MICROCODE * Advanced Power Management feature set Power-Up In Standby feature set * SET_FEATURES required to spinup after power up SET_MAX security extension * 48-bit Address feature set * Device Configuration Overlay feature set * Mandatory FLUSH_CACHE * FLUSH_CACHE_EXT * SMART error logging * SMART self-test Media Card Pass-Through * General Purpose Logging feature set * WRITE_{DMA|MULTIPLE}_FUA_EXT * 64-bit World wide name * URG for READ_STREAM[_DMA]_EXT * URG for WRITE_STREAM[_DMA]_EXT * WRITE_UNCORRECTABLE_EXT command * {READ,WRITE}_DMA_EXT_GPL commands * Segmented DOWNLOAD_MICROCODE unknown 119[7] * Gen1 signaling speed (1.5Gb/s) * Gen2 signaling speed (3.0Gb/s) * Gen3 signaling speed (6.0Gb/s) * Native Command Queueing (NCQ) * Host-initiated interface power management * Phy event counters * NCQ priority information Non-Zero buffer offsets in DMA Setup FIS DMA Setup Auto-Activate optimization Device-initiated interface power management In-order data delivery * Software settings preservation * SMART Command Transport (SCT) feature set * SCT Write Same (AC2) * SCT Error Recovery Control (AC3) * SCT Features Control (AC4) * SCT Data Tables (AC5) Security: Master password revision code = 65534 supported not enabled not locked frozen not expired: security count not supported: enhanced erase 416min for SECURITY ERASE UNIT. Logical Unit WWN Device Identifier: 5000cca37dc106a3 NAA : 5 IEEE OUI : 000cca Unique ID : 37dc106a3 Checksum: correct
禁用 SMART 清理（自動離線測試）後，
smartctl --offlineauto=off /dev/sdx驅動器現在進入“待機”狀態。注意：offlineauto=off 值保存在驅動器中，在重新啟動和斷電後仍然存在。