On Feb 2, 2005, at 1:48 PM, Richard Starr wrote:
--- You wrote: I run raids (1) in all our machines.
I highly recommend raids to anyone who worries about data loss. With HD's
being so cheap there really isn't any reason not to.
--- end of quote ---
So are you running raid to duplicate drives or extend them? I've considered
combining two 80 gig drives but I worry about whether it is less secure than
seperate.
Is combining drives with raid pretty secure after all? Is a raid pair easy to
repair?
Extending a raid across two drives is the most INsecure method available. Mirroring them is a lot more secure.
There are a number of RAID levels, but OS X supports only two natively: RAID 0 and RAID 1.
Two drives set as a single volume is RAID 0. The data is merely stored across ('striped') the two volumes as though they were a single drive.
This will have roughly twice the failure rate of a single drive, since there is no parity or restore information stored. This is the fastest RAID storage mechanism, however, faster than a single drive (though, like dial processors, not twice as fast)
This is widely used for such things as video work that demand raw I/O speed over all else.
RAID 1, which is mirrored drives, is vastly more secure, since to lose data both drives have to fail simultaneously (presuming you have a replacement drive handy to swap in after a failure.) This is the *slowest* raid mechanism, though, since every write to a disk is done twice.
Higher levels of RAID offer different degrees of hot-swapability and security but since they require hardware RAID controllers are probably out of the realm of consideration here.
Basically it really depends on your reasons for having a RAID in the first place: speed or security. That will determine which you use.
-- Bruce Johnson
This is the sig who says 'Ni!'
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