1)Yes...but you won't want to do this for an extended period as you'll only be using half of the 36GB as a spare if an 18GB drive fails. Hence, when you get your replacement 18GB drive, simply replace the failed 18GB drive (new drive will show up as a spare), then MANUALLY fail the 36GB drive so that the 18GB reclaims the role, and 36GB goes back into the spares pool. 2) Same issue as above...the 36GB drives will essentially become 18GB drives. Rather wasteful. You CAN do this, but you probably won't want to. 3) Not a performance or reliability issue...more of a "digital waste" issue.

-----Original Message----- From: Viper Rinspeed [mailto:debian22@yahoo.fr] Sent: Friday, October 19, 2001 11:19 AM To: toasters@mathworks.com Subject: Netapp hardware

Hi,

We have a Netapp 740 with a FC9 shelf (18Gb disks). We are planning to get a DS14 shelf with 36Gb disks. I have two questions: 1- Can we use only one spare disk (36Gb disk) instead of two (1 18Gb and 1 36Gb)? Will the spare 36Gb disk be used correctly to replace a failed 18Gb disk ? 2- Can I mix 18Gb and 36Gb disks in the same volume (same RAID)? If yes, how the data will be written? Let's say, I have 2x18G+2x36Gb (+parity). Will the 36Gb disks stored twice more data than the 18Gb ? Is there a performance issue ? a reliability issue (more data written-> more risk of failure?) ?

Thank you very much.

Jn

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