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тАО03-25-2003 10:47 AM
тАО03-25-2003 10:47 AM
Stripe Size / Stripe Width
a. stripe size
b. stripe width
c. stripe interleave
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тАО03-25-2003 11:00 AM
тАО03-25-2003 11:00 AM
Re: Stripe Size / Stripe Width
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тАО03-25-2003 11:01 AM
тАО03-25-2003 11:01 AM
Re: Stripe Size / Stripe Width
a. stripe size
This is size of each chunk taken out from a disk normally specified in KB.
b. stripe width
The number of disks that constitute a striping group.
c. When a volume is striped, it does interleaving. So, I would say this as stripe size.
To illustrate the above, take four disks of 2 GB each. I can make a stripe volume of 8GB in such a way that the first 64 KB is accessed through Disk1, the next 64KB through Disk2 .. the fourth through Disk4 and the fifth 64KB through Disk1 again. It goes in this round robin fasion.
In the above case (considering I start it new), if I write 256KB of data sequentially, then it will be spread across 4 Disks which is interleaving.
In the above example, 64KB is the stripe size and 4 (disks) is the stripe width.
-Sri
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тАО03-25-2003 09:01 PM
тАО03-25-2003 09:01 PM
Re: Stripe Size / Stripe Width
the above replies are excellent.
You may also wish to have a look at the attached document which discusses about Optimal Storage configuration for Oracle.
hth
Yogeeraj
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тАО03-25-2003 09:16 PM
тАО03-25-2003 09:16 PM
Re: Stripe Size / Stripe Width
You sound to me like an oracle dba, mostly based on your chosen handle here.
Oracle and I would like to advise against striping where the oracle data sits.
The best performance configuration would be RAID 10 or Raid 1/0
You'll want a 1 to 1 mirror of the disks that data sits on.
Example
/dev/vg01/oradata is in disk /dev/dsk/c1t2d0
lvextend -m 1 /dev/vg01/oradata /dev/dsk/c2t2d0
This mirrors the logical volume in the way I suggest. Obviously with oracle down. and the fs unmounted, unless you have onlineJFS.
Just a little free advice, striping is nice, but oracle data is better off in a Raid 1/0 situation.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО03-26-2003 05:41 AM
тАО03-26-2003 05:41 AM