RE: Filesystem Block Size ? 1K or 4K or 8K ?
- From: "Mark W. Farnham" <mwf@xxxxxxxx>
- To: <VIVEK_SHARMA@xxxxxxxxxxx>, "'Greg Rahn'" <greg@xxxxxxxxxxxxxxxxxx>
- Date: Wed, 15 Oct 2008 06:01:19 -0400
VS: I'm pretty sure Greg was asking out of actual interest in your reasons,
not (as I think you took it from your "WOW") as a backhand slap that you are
somehow behind the times.
So maybe you consider filesystems on VxFS more reliable than ASM, maybe you
are just more familiar with them and haven't had a problem with them, or
maybe you have some other technical reason for prefering VxFS in your
environment for your benchmark. I believe Greg was genuinely asking to hear
those reasons. Greg bases his opinions on measured facts, and if you have
some facts about your choice I would also like to hear them. That is not a
slap, but a genuine question. I'm always interested in learning something.
Now, as for your benchmark: Measure. Craft (or find) a simple test that
simulates the i/o load you expect to see in the benchmark. (If I understand
what your "benchmark" exercise is, you are supposed to demonstrate the
maximum throughput against a given set of hardware.) I have a guess if had
to guess, but you should measure unless someone can produce measurements
already made. (I'd guess 8K, just because that means it would have to track
fewer units and probably be a small mathmatical advantage as long as your
oracle block size is an even multiple of the size you choose. Unless your
underlying physical media is ssd, flash, or those fancy new 4K sector
drives, it is likely whatever you are looking at is assembled from 512 byte
"sectors." If the underlying storage is 4K sector drives, definitely use 4K
or 8K, because 1K would be patently stupid in that case and not worth
testing.)
Again, your keyword is "benchmark." If I understand what you are up to, your
customer deserves a test of VxFS at the best measured file system block size
against ASM.
Good luck with your test.
Regards,
mwf
_____
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of VIVEK_SHARMA
Sent: Wednesday, October 15, 2008 3:10 AM
To: Greg Rahn
Cc: ORACLE-L
Subject: RE: Filesystem Block Size ? 1K or 4K or 8K ?
WOW Greg.
Probably I still belong to the Old Technology of using Mounted Filesystems
for Database in a NON-RAC scenario.
Cheers
-----Original Message-----
From: Greg Rahn [mailto:greg@xxxxxxxxxxxxxxxxxx]
Sent: Wednesday, October 15, 2008 3:21 AM
To: VIVEK_SHARMA
Subject: Re: Filesystem Block Size ? 1K or 4K or 8K ?
Out of curiosity, why are you choosing VxFS over ASM?
-----------
On Tue, Oct 14, 2008 at 3:23 AM, VIVEK_SHARMA <VIVEK_SHARMA@xxxxxxxxxxx>
wrote:
> Should the Filesystem (VXFS) Block Size be set to 1K, 4K or 8K? .
Personally
> I think it should be 4 K (i.e. Equal to the Page-size)
--
Regards,
Greg Rahn
http://structureddata.org
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