SAS HDDのSMART情報を取得(3)
fake-eng前回、認識されているSAS HDDを以下のように表示させました。
# smartctl --scan
/dev/sda -d scsi # /dev/sda, SCSI device
/dev/bus/0 -d megaraid,2 # /dev/bus/0 [megaraid_disk_02], SCSI device次に、[ /dev/bus/0 -d megaraid,2 ]のSMART情報を表示させます。コマンドを以下のように実行すると表示させることができます。
# smartctl -a /dev/bus/0 -d megaraid,2
smartctl 7.0 2018-12-30 r4883 [x86_64-linux-3.10.0-1127.el7.x86_64] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Vendor: SEAGATE
Product: ST3300655SS
Revision: 1652
Compliance: SPC-3
User Capacity: 300,000,000,000 bytes [300 GB]
Logical block size: 512 bytes
Rotation Rate: 15015 rpm
Logical Unit id: 0x5000c500016a872f
Serial number: XXXXXXXXX
Device type: disk
Transport protocol: SAS (SPL-3)
Local Time is: Tue Aug 16 10:31:12 2022 JST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Disabled or Not Supported
=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK
Current Drive Temperature: 22 C
Drive Trip Temperature: 68 C
Elements in grown defect list: 0
Vendor (Seagate Cache) information
Blocks sent to initiator = 1090160259
Blocks received from initiator = 1320122583
Blocks read from cache and sent to initiator = 769910154
Number of read and write commands whose size <= segment size = 779853165
Number of read and write commands whose size > segment size = 0
Vendor (Seagate/Hitachi) factory information
number of hours powered up = 77308.25
number of minutes until next internal SMART test = 59
Error counter log:
Errors Corrected by Total Correction Gigabytes Total
ECC rereads/ errors algorithm processed uncorrected
fast | delayed rewrites corrected invocations [10^9 bytes] errors
read: 74705047 14 0 74705061 74705061 134635.756 0
write: 0 0 0 0 2 5105.199 2
Non-medium error count: 30
No Self-tests have been loggedSATA HDDで表示される情報と相違があります。ただ、基本的には
- Elements in grown defect list
- number of hours powered up
- Error counter log内Total uncorrected errors
- Non-medium error count
くらいだと思います。ただし、HDDメーカーによってはnumber of hours powered upがなかったりします。
Elements in grown defect listはGリストと呼ばれるもので「工場出荷後に不良セクタと予備セクタを紐づけるためのリスト」となっています（引用：https://ja.wikipedia.org/wiki/%E4%B8%8D%E8%89%AF%E3%82%BB%E3%82%AF%E3%82%BF）。number of hours powered up以外は0に近い方が望ましく、特にGリストが1以上であると不良セクタがあるという判定となります。
