62.6GB how the math works out for me. For my calculations I use 62GB for computing usable space before snapshot reserve.
In your configuration I see the following RAID group 1 (8 disks, 7 data + 1 parity) 434GB
RAID group 2 (6 disks, 5 data + 1 parity) 310GB
Your disk count adds up to 14 so you do not have a spare disk in this configuration, 6+8=14. Changing RAID group 1 (7 disks, 6 data + 1 parity) 372GB and this would leave you with one spare disk drive for failures.
-gdg
Steve Roche wrote:
According to my configuration tool you would realize 606GB of usable space assuming a 10% snapshot reserve.
-----Original Message----- From: Geoff Hardin [mailto:geoff.hardin@dalsemi.com] Sent: Thursday, December 13, 2001 12:36 PM To: toasters Subject: Real vs Raw disk space
Toasters, We are looking at purchasing some new DS14 shelves with 72 GB disks. In order to properly forecast our disk space growth, I was wondering if anyone out there had taken a look at the difference between real and usable disk space realized with these new shelves and drives.
Basically, our environment is as follows: DS14 Shelf with 14 72 GB disks (1 RAID group of 8 disks, 1 RAID group of 6 disks), attached to a filer running DOT 6.1R1P1. We will have 1 spare disk and no snap reserve.
Geoff Hardin geoff.hardin@dalsemi.com