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-   -   hard drive advice (raid 1 sata) (http://www.linuxquestions.org/questions/linux-hardware-18/hard-drive-advice-raid-1-sata-584137/)

rblampain 09-12-2007 07:45 AM

hard drive advice (raid 1 sata)
 
Distro Debian Etch stable.
I am going to use a home machine as a server until the traffic requires something more professional. The board is an Asus a7v600-x with 2 sata slots. I planned to use these a a raid 1 set up for data only and keep the IDE channel for the OS.

My questions:
It seems some hard drives are made for RAID (bearing the mention "RAID edition" or similar), is it a true feature or some commercial gimmick?

If it is a true feature, why do they still have a cache (raid is supposed NOT to use the HD cache) and are they worth choosing over other drives?

Does anyone know of current info on the subject that could help me in the selection of the drives?

Thank you for your help.

macemoneta 09-12-2007 11:38 AM

There is noting special about RAID drives. Some manufacturers use the term when they implement time-limited error recovery (which they should have anyway; it's more of a bug if they don't). Every disk I/O subsystem (both hardware and software) will consider a drive non-responsive if it doesn't end a command in a given interval. The way to read "RAID Edition" is that the manufacturer is saying "These drives aren't broken".

Cache and RAID are not mutually exclusive; I'm not sure how you got that impression. Some very old hard drives did not properly flush the cache when told to do so. However, that could cause filesystem corruption whether the drive was used for RAID or not.

The most important thing to keep in mind is that RAID is not a substitute for backup. Not even a little bit. Ever.

rblampain 09-15-2007 12:19 AM

Thank you for your answer.


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