Re: Upgrade raid0 to raid1

On Fri, 23 Nov 2007 13:13:38 -0800, Kedarius wrote:

Hi,
I would like to ask, whether there are any possibilites how to upgrade
running raid0 to raid1.
I have two 2GB flash drives running as raid0 and I would like to change
it to two 4GB flash drives running RAID1 without stopping the array. Is
this somewhat possible?

Radek

Plug in the other two drives, configure them as RAID1 and then copy the
contents of the old drives to the new ones.

RAID0 and RAID1 perform two separate functions, RAID0, otherwise know as
striping, increase your bandwidth. RAID1, otherwise known as mirroring,
replicates the data on two drives to provide redundancy. If you have more
that two drives then you can combine the two functions in a RAID5 array.
However with just two drives your choices are 0 or 1 and they are not
compatible. If you pull one drive on a RAID1 and replace it with another
then you can rebuild the RAID set. If you pull one drive from a RAID0 you
have nothing be cause the data is spread across both drives.

Just curious, why are you doing RAID with FLASH drives? FLASH drives are
great for moving data around but I'm not sure I would want to use them as
my main storage. FLASH drives have very slow write times, and they also
have a limited number of write cycles. In cameras, phones and MP3 players
this doesn't matter because they are fast enough and you do very few
writes to any particular location. I'm assuming you are using them for
some very low power application, but I would think that a single drive
would be best for that.
.

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