Brian,

You can have a volume with one or more RAID groups, but not a RAID group with multiple volumes. Disks added to a volume will automatically be added to the first existing raid group until that raid group reaches it's maximum size. After the maximum number of disks per the RAID group "raidsize" is reached, a new raidgroup is automatically created with a parity disk. However, you can create logical partitions on the volume using qtrees.

Raid size is set either at volume creation by ; vol create volname [ -r raidsize ] example: filer > vol create vol1 -r 14

or on an existing volume by vol options volname optname optval example: filer > vol options vol0 raidsize 21 ( sets the size of the raid size on existing raid group and subsequent ones for this volume )

From the manual;

The default number of disks in a RAID group (including the parity disk) is 14 ( 2 shelves). A RAID group must contain at least two disks. The largest RAID group size you can create manually is 28 disks. The maximum RAID group size is 52 disks.

Using smaller RAID groups reduces disk reconstruction time if a disk fails. Using smaller (therefore, more) RAID groups provides higher reliability by reducing the risk of data loss due to multiple-disk failure. Conversely, configuring with larger (therefore, fewer) RAID groups in a filer uses fewer disks for parity, leaving more disks available for data storage.

Jeff Soto SE NYC NetworkAppliance, Inc mailto:jsoto@netapp.com Mobile : 1-516-635-0668 CorpVM : 1-408-822-8567 Pager : 1-877-563-8277 eFax: 1-419-831-5019

-----Original Message----- From: Brian Hostetter [mailto:BrianH@dice.com] Sent: Wednesday, June 14, 2000 11:53 AM To: toasters@mathworks.com Subject: Raid Groups and Volumes Importance: High

Hello, I just got my two new 760s with 2 shelves of 36G drives each. I am going through the setup and have a question on Volumes and Raid Groups. Can I create two shelves into one big raid group in order to take advantage of all the spindles, and then create two volumes on that raid group? Or do I have to create 2 raid groups (thus using an extra parity drive) and have 1 volume living on 1 raid group.

--Brian

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