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标题: [2011/02/25修訂]LSI controller相關議題.... [打印本页]

作者: per1-q1222 时间: 2011-2-25 00:53
标题: [2011/02/25修訂]LSI controller相關議題....
本帖最后由 per1-q1222 于 2011-2-25 01:01 编辑

這邊做為一些收集....
可能確定, 不確定或著LSI還在確認中..

>>Q&A: LSI CacheCade目前似乎有一些bug, 創建new SSD Cache, 作為Multiple SSD, 僅會有一顆SSD有作用, H/W Reset後才會全啟用...

>>Q: LSISAS2008產品的Dimmer Switch特徵跟LSISAS2108一樣嗎?...
>>A: LSI=>New Dimmer switch is not planned for our entry line products.

>>Q: LSISAS1078的Dimmer Switch支持特徵為何?
>>A: 僅能對應到MegaRAID 3.6版本. 請參閱: http://www.lsi.com/DistributionSystem/User/AssetMgr.aspx?asset=52593

>>Q: 為什麼LSISAS1078沒辦法使用2TB以上的HDD呢?
>>A: 因為2TB以上的PD支持是對應MegaRAID 4.3版本, LSISAS1078沒包含其中.

>>Q: LSISAS2008有沒有支持2TB以上的PD呢?
>>A: 樓下說支持了.

>>Q: 為什麼LSISAS1078在MSM 8.16版點擊Power Save相關設定沒有任何反應?
>>A: 因為這是bug. LSI還在處理中.

>>Q: LSISAS2108為什麼有些HDD產品在MSM沒有看到溫度顯示呢?
>>A: 因為那是bug. LSI還在處理中.

>>Q: LSISAS2008是Hardware RAID solution嗎?
>>A: LSI跟我打模糊仗. 沒說清, Supermicro跟我講明是driver-based RAID. 個人臆測是所謂IR模式下, 提供的是Hardware RAID solution, 而IMR模式下提供RAID 5則是Driver-based RAID, 因為重要的XOR operation必須交由Host CPU承載.

>>Q: LSI RAID HBA我插在技嘉的主板沒辦法正常使用, 會彈出實體記憶體被搶用不足的情況.
>>A: 兼容性問題. 不要浪費時間, 請換板.

>>Q: WebBIOS中的DiskActivity屬性是做啥用的?
>>A: 作為定位disk之用(locate a disk). Use disk activity for locate...

>>Q: 為啥SATA SSD/HDD在Green Activity LED沒有恆亮?
>>A: LSI=> The expected behavior is a continuously lit green LED when a drive is online, optimal, and not running I/O. I expect that there may be some difference in the way the backplane is addressing the SATA drives.
>>>> Supermicro=> HDD activity LED is controlled by HDD, and its behavior is determined by its microcode.
SAS and SATA HDD will have different behavior, it is normal.
In normal state:
SAS HDD – activity LED on( green )
SATA HDD – activity LED off

>>Q: 增強型的Dimmer Switch在SATA和SAS間有沒有差異?
>>A: 有. SAS和SATA有不同的電源管理規格. SAS的優勢性更高. T10 Power State....

>>Q: Coercion Mode是做甚麼用的??
>>A: 作為同一個array, 差異容量硬盤支持...

2011/01/08
>>Q: 如何發揮發揮SSD的最高性能??
>>A: NRA&WT&DIO, set Stripe Size as 64KBytes...

>>Q: 加裝FastPath後有甚麼效果?
>>A: 透過FastPath去Unlock後, 可以大幅提升IOPS以及降低Access Time, 效果是明顯的, 設定同上面...

>>Q: LSI CacheCade怎麼使用?
>>A: 加裝上去後, 將所指定的HDD把IO Policy設為CIO即可使用.

2011/01/09
>>Q: 我從一些文檔中看到Write-Journaling這個功能, 他是做甚麼用的呢?
>>A: 這是目前RAID實務設計中很普遍在用的功能, 該功能透過一顆小量空間的NVSRAM來儲存log建立checkpoint使用, 可應用作為災後復原上一次操作. LSISAS107/2008/2108相關產品的NVSRAM皆為32KB.

>>Q: LSISAS2008的IR產品對於RAID建立有限制嗎?
>>A: 存有很大的限制. Stripe Size會被鎖死在64KB; 不支持HDD SAS/SATA Mix; 最高只能使用14個硬盤. 最多只能建立兩個VD(只能使用14個硬盤).

2011/01/18
>>Q: 6Gb/s HDD/SSD為什麼安裝在3Gb/s MegaRAID SAS Controller, 發現Negoiation Link Speed會強制在1.5Gb/s的速率呢?
>>A: LSI=> 3Gb/s MegaRAID controllers were designed before the 6Gb/s standard was developed. The card may not automatically set the correct link rate for 6Gb/s products. We cannot guarantee that the 3Gb/s speed will automatically be negotiated to with 6Gb/s drives connected to the 3Gb/s controller.

2011/02/03
>>Q: MegaCLI中的LDBBM是指甚麼呢? 他有甚麼用處? 如何作用?
>>A: 他指的是Logical Drive Battery Back-up Module, 指的就是BBU部分.作用方式, 根據LSI的說法如下:
If your controller supports BBUs, you are using a BBU, and you are write caching, the flag should change.

>>Q: 為什麼我安裝BBU, 設定回寫快取後, 我使用MegaCLI依然發現Enable LDBBM還是關閉的, 為什麼呢?
>>A: 這個issue我已經回報給LSI, 目前判定可能為bug....

>>Q: PFK是指甚麼? 作甚麼用?
>>A: PFK就是Premium Features Key. 透過PFK可以用來啟動LSI的高階軟體服務來加值. 根據LSI的說法:
There are two types of advanced software keys: hardware and license. If you purchase a hardware key, seating the key on the board will flip a switch in the NVRAM. Removing the hardware key will change that switch back to its original state. In essence, the key is not a permanent change. In other words, you cannot purchase a hardware key, seat it on several boards, and permanently enable the feature.

License keys are permanent switches, but they are single-use. Enabling the license will make a change in the NVRAM which is permanent, but the license is automatically disabled after first use.

>>Q: MegaCLI的PFK in NVRAM是指甚麼呢?
>>A: 就是在NVSRAM存放PFK. 根據LSI的說法如下:
License keys are permanent switches, but they are single-use. Enabling the license will make a change in the NVRAM which is permanent, but the license is automatically disabled after first use.

>>Q: 透過軟體認證, 第一次使用時, 無法使用, 這是為什麼呢?
>>A: 因為還要必須要透過專屬的Server來取得授權(Authorization), 再從指定的工具激活相關服務.

>>Q: 這樣做有何目的?
>>A: LSI=> The goal is to prevent duplication of single licenses.

>>Q: 軟體認證依然具備遷移性(Migration)嗎?
>>A: LSI=> Yes, you can remove it from one and move it to another. It will no longer work on the old controller, but it will work on the new controller.

>>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, 便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. 變不會將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

2011/02/04
>>Q: IMR模式下的LSISAS2008產品是Hardware RAID嗎???....
>>A: 根據我死纏爛打

, LSI的回答: The 9240-series controller are software RAID. 不是Hardware RAID...
注意喔! 9240系列就是IMR模式, 意味著IMR模式的LSISAS2008產品都是software RAID....

2011/02/25
>>Q: DirectPDMapping作用是甚麼?..
>>A: DirectPdMapping is a flag which disables use of a backplane. It directly maps the drives instead of mapping the SAS expander.
DirectPdMapping exposes devices behind an expander to the OS. This does not disable the expander, but changes how it interacts with the controller and OS.
If you do not wish to expose the drives to the OS, this policy should not be enabled. The controller does indeed bypass the expander and move directly to directly PD mapping.
The expander could be bad if it was enabled, but that would have nothing to do with it being enabled or disabled.

>>Q: LSISAS2008內置2MB buffer的用途?
>>A: LSI=> This is used for processes internal to the chip and not for read or write cache.
>>A: Intel=> Context memory is like processor cache memory. The LSISAS2008 doesn’t support “external” cache memory so it’s embedded in the ROC/Controller to provide a place for calculations and temporary data storage. Because it’s embedded there isn’t space for much memory (2MB).

其他等我想到在補...

作者: stephenmaxmax 时间: 2011-2-25 13:34
2011/01/18
>>Q: 6Gb/s HDD/SSD為什麼安裝在3Gb/s MegaRAID SAS Controller, 發現Negoiation Link Speed會強制在1.5Gb/s的速率呢?
>>A: LSI=> 3Gb/s MegaRAID controllers were designed before the 6Gb/s standard was developed. The card may not automatically set the correct link rate for 6Gb/s products. We cannot guarantee that the 3Gb/s speed will automatically be negotiated to with 6Gb/s drives connected to the 3Gb/s controller.

那如果，6g的硬盘接在3g背版上，然后3g背版接6g的卡呢？

作者: per1-q1222 时间: 2011-2-25 14:27
本帖最后由 per1-q1222 于 2011-2-25 14:27 编辑

stephenmaxmax 发表于 2011-2-25 13:34
2011/01/18
>>Q: 6Gb/s HDD/SSD為什麼安裝在3Gb/s MegaRAID SAS Controller, 發現Negoiation Link Speed會 ...

這會以backplane來決定...

作者: stephenmaxmax 时间: 2011-2-25 15:36
那改天我买块7k3000试试看

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