Re: Filesystem Block Size ? 1K or 4K or 8K ?

  • From: zhuchao@xxxxxxxxx
  • To: "VIVEK_SHARMA" <VIVEK_SHARMA@xxxxxxxxxxx>,"ORACLE-L" <oracle-l@xxxxxxxxxxxxx>
  • Date: Tue, 14 Oct 2008 11:35:40 +0000

If direct io is being used, the difference maybe less.
Anyway I don't see any benefit using 1k/4k blocksize.
If you want best throughput, go with raw volumes.
Have done all tuning on hp kaio setup to maximize os capability?
Sent via BlackBerry by AT&T

-----Original Message-----

Date: Tue, 14 Oct 2008 16:38:03 
To: zhuchao@xxxxxxxxx<zhuchao@xxxxxxxxx>; ORACLE-L<oracle-l@xxxxxxxxxxxxx>
Subject: RE: Filesystem Block Size ? 1K or 4K or 8K ?

Thanks V much Zhu

HP who is partnering the Benchmark states - since Filesystems are being Mounted 
with Direct I/O therefore 1K F.S. block size is preferred to 8K.


From: zhuchao@xxxxxxxxx [mailto:zhuchao@xxxxxxxxx]

Of course set to 8k

Date: Tue, 14 Oct 2008 15:53:52 +0530

We are in the process of Setting up DB Server for an OLTP Banking Application 

HP-UX B.11.31
system device block size(think this is the O.S. block size) = 1K
Base page size = 4K.
DB_block_size = 8K

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)

Cheers & Thanks V much


P.S. Will provide any data needed

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