Re: How to create Root aggregate across external shelf during initialization
2019-07-16 07:16 AM
Regarding this comment:
3. As you noted, if you expand a RG with partitions, spare whole disks will be automatically partitioned. That said, you would avoid the wasted P1 partition "tax" if you simply created a new RG with your external shelf drives as whole disks.
Not always the best in this case. Why? If I have 11 or 12 partitioned disks (using RAID-TEC), This should be something like 7d+3p+1s or 8d+3p+1s or 7d+3p+2s. In all cases, RAID-TEC is using 3 parity drives. If I create another Raid Group (of say 8d+3p+1s), it will consume 3 more parity drives (30TB). If I just expand the RAID-group and let the system partition, the worst case you are losing 100GB per disk for the root partition (that would be up to 1200GB which is much better than 30TB).
Exceptions to everything, right? If I have more than an extra shelf, then I would have to consider what happens as I expand and do I plan to add more in the furture. i.e. Do I want the Parity tax now (ad be able to add drives later with no potential partity needed) or just add the parity later?