Mac OS X software RAID: “Automatically rebuild RAID mirror sets” option

mac-osxraid

As per the title, what are the pros and cons of using the "Automatically rebuild RAID mirror sets" option when creating a software RAID in Disk Utility on Mac OS X (in my case, a mirrored set)?

Best Answer

The diskutil man page (OS X 10.6) says:

AutoRebuild - If true, the system attempts to rebuild degraded mirrored volumes automatically. When looking for devices for rebuild, AppleRAID first looks for hot spares and then degraded members. Use a value of "1" for true and "0" for false.

I think it would not be desirable to rebuild the mirror using a disk marked degraded, so you might consider not using AutoRebuild if you don't have a hot spare.

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Win2008 R2 server core software RAID

So is the size of the extent big enough? IE is the free unpartitioned space available big enough to house the partition you right-clicked? Some 1TB disks have different actual size...

Also, I'd normally just init the disks as basic disks, create a partition on one and then "add disk" to that one to create the mirror which would then do the conversion logic for me, instead of manually converting to dynamic disks first. Something akin to (not tested for syntax perfect-ness and only applicable if this is a data volume, not the boot volume ;):

clean all
create volume simple disk=1
add disk=2

Software RAID in Windows Server 2003

What if your MotherBoard die?. I think that software RAID will be easier to recover than the one provided by your MB. You might also consider using another one/two HD for your OS and putting your data in the soft raid volume. Performance will probably be equivalent between your soft and hard solutions.

EDIT: Here's a link for you showing how RAID levels works. Hope this fits your needs.

Best Answer

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Win2008 R2 server core software RAID

Software RAID in Windows Server 2003

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