From: Kumar, Praveen (cahoot) (Praveen.Kumar@CAHOOT.COM)
Date: Mon Jan 12 2004 - 11:23:05 EST
Pablo,
Thanx for the information, but the performance tuning guide says
STRIPE WIDTH is number of stripes, does it mean number of physical volumes
that accomodate the striped lv as you said.
Regards
Praveen
-----Original Message-----
From: Clifton, Pablo [mailto:Pablo.Clifton@BCBSFL.COM]
Sent: 12 January 2004 16:08
To: aix-l@Princeton.EDU
Subject: Re: STRIPE WIDTH
Praveen-
I see a lot of different definitions out there for stripe width and size.
*My understanding* is that:
stripe width = The number of physical volumes that
accomodate the striped lv.
= the number of drives striped
across, example: 8 disks
stripe size = Specifies the size of the stripe for a
striped logical volume.
In AIX the size can be 4K, 16K, 32K,
64K or 128K bytes.
This is also referred to as the
"stripe unit size" or "chunk size".
The ["stripe width" * "stripe size"] = ["stripe length"]
but you will see "stripe size" and "stripe length" swapped
around a lot.
The Redbook: "AIX Logical Volume Manager from A to Z" has some info on
striping.
Remember:
striping is done at the LV level
To benefit from striping, the stripe size needs to be low
like- 128K, 64K in order
to get multiple drives active.
-pablo
---
Pablo Clifton
UNIX Technical Services
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
Kumar, Praveen (cahoot)
Sent: Monday, January 12, 2004 10:27 AM
To: aix-l@Princeton.EDU
Subject: STRIPE WIDTH
HI *,
What's the difference between STRIPE WIDTH & STRIPE SIZE. Is it
no.of stripes and size of each stripe resp or am i wrong.
Also can someone brief on lockstat command,i have gone through the manuals
but could not get much info...
TIA
Praveen.K
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