Please read additions to 4 and 5

-----Original Message----- From: Yizhong Zhou [mailto:zhou@mathworks.com] Sent: 04 August 2000 22:16 To: Ng, Pok Cc: 'toasters@mathworks.com' Subject: Re: Q. on Qtree/Volume/RAID group

On Fri, 4 Aug 2000, Ng, Pok wrote:

I have few questions regarding qtree, volume and raid group

1. Is it ture that raid group is added to a volume automatically?

A raid group is created automatically when you add new disks to a volume and fill the current raid group.

2. is there any command for creating new raid group?

No. When the current raid group is filled, a new raid group is created automatically.

3. when a qtree is created on a multi raid group volume, does the qtree span

across all raid group? do you have control on which raid group the qtree can reside on?

I don't think you have control over what raid groups a particular qtree can use.

4. when the max disk per raid group is increased, does it affect all raid

groups?

I believe it only affects the current raid group. AND any subsequent raid groups

5. I know if a new disk is added, it will be added to the last raid group of

a volume. Assuming the answer to Q4 is yes, then what happen if the last raid group of a volume is filled and there exists raid group(not the last one) in the same volume that is not filled?

If the default raid group is increased the current and subsequent groups ONLY can be added to. As raid groups build themselves as they are required, then by default once raid group 3 is started raid group 2 is assumed to be complete.

See 4).

Yizhong Zhou zhou@mathworks.com, (508) 647-7371 The Mathworks, Inc. 3 Apple Hill Drive, Natick, MA 01760