詠鉌のIT

Recently I've done some review to few hard disk which configured with hardware RAID related cases, found that most of the hard disk replacement that lead to OS 'crash' is due to the server did gone through ChkDsk, either trigger by user or start automatically.
I do not know why until I found this article with the below statements:

"....Chkdsk is not RAID-aware. Its algorithms only work in the simplest cases. In general, it must be avoided. If chkdsk attempts to repair one or more member disks, the RAID data patterns will be destroyed, usually beyond recovery."

Frankly, I have no idea how true is the abovementioned statements, as I can't find any relevant info from Microsoft site. However, the experiences that I gone through with customer are real. In this moment, I think we should try to avoid running the Chkdsk when there is any hard disk failure (with hardware RAID configuration).

For more info, you may go to the link below:
http://www.quetek.com/RAID_mistakes.htm

Yesterday, I were surprised by a Singapore customer with the inquiry as below:

"...I suspect is your RAID card limitation to detect the full size of my 3TB SATA Hard Disk..."

Wow, I feel shame as my hardware knowledge not really up-to-date. I use around 12mins of researching, confirm that H200 does not able to detect hard disk with more than 2TB at this moment. According to Dell, this support features may come out this year (2011), but it doesn't really mentioned the exact release date.
If you really have budget to upgrade all Hard Disks to the size of 3TB SATA, you may consider to upgrade the RAID card as well. Currently, Dell PERC H700 & H800 are support hard disk with more than 2TB (need to fulfill the minimum requirement of firmware).

Dell PERC H700 and H800 – The following firmware revision (or later) must be applied on the Storage Controller Cards to obtain support for >2 TB drives. The firmware release numbers and revisions are below:  

For SAS drives >2TB: 7.1 FW A02/12.3.0-0032 

R269683 – H800; A02 ( listed as DELL_PERC-H800-ADAPTER_XX_XXXXXXX.exe at the below download link) 

R269684 – H700I: A02 ( listed as DELL_PERC-H700-INTEGRATED_XX_XXXXXXX.exe at the below download link) 

R269685 – H700A; A02 ( listed as DELL_PERC-H700-ADAPTER_XX_XXXXXXX.exe at the below download link) 

R269686 – H700M; A02 ( listed as DELL_PERC-H700-MODULAR_XX_XXXXXXX.exe at the below download link)

SATA Support – SATA drives will be supported in Q1, 2011.


The above mentioned releases of firmware can be downloaded from http://ftp.us.dell.com/sas-raid/.

Dell H200 – Support is planned for the H200 in 2011

Therefore, Dell PERC H200 is yet to have latest firmware to support hard disk with size larger than 2TB. Hopefully the newer firmware is out soon to eliminate this limitation.

For more info, you may visit Dell official website: Click Here!
**The abovementioned info are obtained from Dell TechCentre for sharing purpose