How to grow a RAID array for increased partition size ?

[doublehp]

I have two disks hda and hdc, with many partitions. At the moment, md9 is hda9+hdc9 in RAID1.

I managed to make room after hda and hdc. So, i now can increase the size of partitions, then size of array, then filesystem. Thats ok. Filesystem is offtopic. All operations are performed on offline filesystem, but on online volumes (system does boot on hda, and / is on hda7; may require reboot to make kernel understand new size of hda9 after grow).

I have two problems:
- take care or growing the partition
- how to resize the array

1: I know that array infos are stored at the end of the volume; using fdisk to change the end sector of the partition is not a problem; but, as i will do this, i fear the RAID driver will be mistaken about the location of the table: if i move the "last sector", the driver is likely to look for descriptor "too far". I wonder how i can resize the partition without breaking any info about the slice.

2: after this, i will need to use mdadm to use the full size of partitions. And i have no clue how to do this. Because I am in a very specific and rare case where i grow the size of the volumes themselves ! and this is not a typical case we find in tutos.

Anyone can help ?
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DEMAINE Benoît-Pierre (aka DoubleHP ) http://www.demaine.info/
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[doublehp]

Errata: the free space is BEFORE hda9 ... i am not going to move the end of partition, but the beginning.
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DEMAINE Benoît-Pierre (aka DoubleHP ) http://www.demaine.info/
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[doublehp]

up :/
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DEMAINE Benoît-Pierre (aka DoubleHP ) http://www.demaine.info/
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[fangorn]

It is a RAID1, so no problem with redundancy.

Just deactivate the RAID, resize the partition on one disk, see if it changes the partition number because of deleted partition(s) before it, resize and check the filesystem, if it is ok, resize the partition on the second drive, adjust your RAID config if necessary mark disk2 as dirty and rebuild the RAID1 from disk 1 to disk 2.
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[doublehp]

What about if the RAID zone contains informations about size ? then mdadm will just see that the volume is bigger than it should => unpredictable behaviour ...
_________________
DEMAINE Benoît-Pierre (aka DoubleHP ) http://www.demaine.info/
>o_/ Coin coin coin \_o<
to contact me (MSN,ICQ, JABBER, Skype ... ) http://benoit.demaine.info/contact.png