Resizing RAID5 under ASM

Lots of RAID managment software (including Array Config Utility provided by HP) allows non-destructive dynamic reconfiguration of RAID arrays, including expanding them to add extra disks.
If I'm running an ASM instance using an ASM diskgroup (external redundancy) on a RAID 5 array using and I dynamically resize the RAID 5 array by adding extra disks, is the ASM instance going to:
a. seamlessly detect that the array is bigger and expand the diskgroup accordingly (I wish) or
b. have a heart attack.
The resize diskgroup command doco states:
If you do not specify a new size in the SIZE clause then ASM uses the size of the disk as returned by the operating system. The new size is written to the ASM disk header and if the size of the disk is increasing, then the new space is immediately available for allocation.
So it does seem to imply that it can all be done dynamically with no loss of service...
Anyone ever tested this?
Thanks,
Gavin

a. seamlessly detect that the array is bigger and expand the diskgroup accordingly (I wish) or
b. have a heart attack.
Anyone ever tested this?Hi,
first of all it depends what from you created your disk group. If you put the whole disk (e.g. "/dev/sda") in it ASM should recognize the resize immediately.
If you first created a partition on the disk (e.g. "/dev/sda1") as oracle recommends to prevent some administrator from using the disk cause he though it was empty then ASM will NOT detect the change. You have to adjust the partition after resizing (growing) the disk.
Ronny Egner
My Blog: http://blog.ronnyegner-consulting.de

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