raidtools

[Bob Tanner <tanner@real-time.com>]

I have read over the raidtools documentation and I have the following
question.

If I have /dev/md0 being made of /dev/sda1 /dev/sdb1 working just
fine, now I get another drive /dev/sda3. I wish to add /dev/sda3 to
/dev/md0, can I do this without having to mkfs on the /dev/md0?

According to the FAQ it looks like I have to, which sucks because that
is 16Gb of data I will be erasing :-)

I ask because the README and FAQ are talking about 0.31 and I am
running 0.42. Anyone with expirence on this?

From the FAQ:

Q: I've created a linear md-dev with 2 devices. /proc/mdstat shows the
total size of the device, but df only shows the size of the first
physical device.

A: You must mkfs your new md-dev before using it the first time, so the
fs will cover the whole device.

From the README

Future extensions :
        Well, what I'd like to have now is a way to extend an existing
file system by just adding a new device to a md-dev running in linear
mode (of course, no data loss !!).  If Remy Card reads this, I'd be glad
to have his opinion about it (Yes, I can read french ;-).

-- 
Bob Tanner <tanner@real-time.com>       | Phone : (612)943-8700
http://www.real-time.com                | Fax   : (612)943-8500
Key fingerprint =  6C E9 51 4F D5 3E 4C 66 62 A9 10 E5 35 85 39 D9