PCDVD數位科技討論區 - WDC官方不建議Desktop系列硬碟使用在RAID磁碟陣列環境下

引用:

作者我要開機啦

請問一下
上面說WD硬碟有錯時會進行2分鐘的修復動作
但HBA允許的修復時間僅為7~15秒

那是不是說硬碟在進行錯誤修復其實只要花幾秒鐘而已
不然為什麼HBA會把時間定在7~15秒

所以SAS的硬碟沒有這種問題嗎 :confused: :confused:

"但HBA允許的修復時間僅為7~15秒"
這和廠商的RAID設計有關....

"所以SAS的硬碟沒有這種問題嗎 :confused: "
量身訂做的SAS規範怎麼會有這種問題...:laugh:....
但是這塊和SMART有相關係...
來看看我以前寫的這串...
這是以LSI MegaRAID Controller的作法
>>Q: WebBIOS中有一個SMART Polling屬性? 是做甚麼用的呢?
>>A: 主要用以輪詢一段時間, 預設是300秒. 透過一個特殊的polling timer來記時, 當達到300秒的時候, RAID controller便會要求HDD的SMART報告. 診斷HDD的當前運作情況.

>>Q: TLER/ERC/CCTL會不會跟SMART Polling有關係呢?..
>>A: 多多少少有些關係, 但是不是SMART Polling跟TLER/ERC/CCTL成絕對關係.
SMART polling and TLER are only related in the sense that both deal with disk errors. The controller does SMART poll, but this is not related to TLER.
TLER/ERC/CCTL的設計就是防範當error correction超過RAID controller所規定的threshold時, RAID controller將會把超時的HDD判定為failed並且將他drop, 也許這個error correction可能是deep的情況. 關於LSI RAID controller所規定的threshold, LSI表示如下:
The time-out threshold is ten seconds.
前面講過, 當LSI RAID controller的polling timer達到300秒的時候, 變遍歷收集每顆硬碟的SMART資訊. 在TLER/ERC/CCTL部分, 如果取得的SCT ERC Timer偵測發現超過規定的threshold, 也就是10秒的情況下. LSI RAID controller便會將該超時的HDD給強制drop. 在這個案例下, SCT ERC Timer記載的value便會是0秒, 也就是unlimited. 如果帶有TLER/ERC/CCTL支持的HDD, 通常SCT ERC Timer設定會是在7 sec以下, 這時SCT ERC Timer<timeout threshold. 便不會將HDD給強制drop掉. 這將會提升對Storage System很大的穩定性.
LSI=> A drive will drop after 10 seconds

但是ERC不能開嗎??..
未必...
WD開不了但是其他牌的話...:shy:..
C:\Program Files (x86)\smartmontools\bin>smartctl --scan
/dev/sdi -d ata [ATA]
------------------------------------------------------------------------------------------------------
C:\Program Files (x86)\smartmontools\bin>smartctl -a /dev/sdi
smartctl 5.40 2010-10-16 r3189 [i686-w64-mingw32-2008r2(64)] (sf-win32-5.40-1)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Device Model: Hitachi HDS723020BLA642
Serial Number: MN1220F30GYSED
Firmware Version: MN6OA580
User Capacity: 2,000,398,934,016 bytes
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: ATA-8-ACS revision 4
Local Time is: Wed Mar 02 11:36:18 2011 TST
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: (0x84) Offline data collection activity
was suspended by an interrupting command
from host.
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: (18950) seconds.
Offline data collection
capabilities: (0x5b) SMART execute Offline immediate.
Auto Offline data collection on/off supp
ort.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
No 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.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 255) minutes.
SCT capabilities: (0x003d) SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
------------------------------------------------------------------------------------------------------
C:\Program Files (x86)\smartmontools\bin>smartctl -l scterc /dev/sdi
smartctl 5.40 2010-10-16 r3189 [i686-w64-mingw32-2008r2(64)] (sf-win32-5.40-1)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net
SCT Error Recovery Control:
Read: Disabled
Write: Disabled
------------------------------------------------------------------------------------------------------
C:\Program Files (x86)\smartmontools\bin>smartctl -l scterc,70,70 /dev/sdi
smartctl 5.40 2010-10-16 r3189 [i686-w64-mingw32-2008r2(64)] (sf-win32-5.40-1)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net
SCT Error Recovery Control:
Read: 70 (7.0 seconds)
Write: 70 (7.0 seconds)
------------------------------------------------------------------------------------------------------
C:\Program Files (x86)\smartmontools\bin>smartctl -l scterc /dev/sdi
smartctl 5.40 2010-10-16 r3189 [i686-w64-mingw32-2008r2(64)] (sf-win32-5.40-1)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net
SCT Error Recovery Control:
Read: 70 (7.0 seconds)
Write: 70 (7.0 seconds)
------------------------------------------------------------------------------------------------------