Re: What's VxFS buffer size ?

8K block size is the default, when you create a new file system by using newfs, you can specify the size differently.

Zhenming

Bass Chorng wrote in message ...
>In Steve Adam's article of "Why a Large Database Block Size", he
>points out that all Unix file system buffer size are invariably 8K.
>
>Does anybody know what VxFS default buffer size is ? Is it tuneable ?
>How large can it go ? How do you verify it ? And how do you change it
>?
>
>The other question is, if I can beef it up , do I still benefit from
>raw on my datafiles ? I am talking about a database that's not write
>intensive at all.
>
>I tested our system (VxFS, no QIO) with full table scan in very large
>db_file_multiblock_read_count and examine the trace file. The blocks
>that Oracle is reading per IO is maxed at 256K. So I know for sure
>VxFS is not
>operating at the same 8K buffer size like ufs.
>
>Thanks for any knowledge sharing in advance.
>
>-Bass Chorng
Received on Tue Jul 31 2001 - 23:02:42 CDT