Re: Filesystem optimisation for postgresql tables and WAL

I don't remember saying they should match, it is just that it is nice if
it does, but I don't think it would make any major difference in
performance.  In fact, some use 32k pages sizes, and get a performance
boost, and clearly don't have 32k file system blocks.

---------------------------------------------------------------------------

Rajesh Kumar Mallah. wrote:
>
> Hi,
>
>
> I have got there SCSIs HDDs for the postgresql Box
> i plan to install OS on 1st , 2nd for tables and indexes and third
> for pg_xlog.
>
> Bruce Momjian's "H/W Perf tuning" on
> http://www.ca.postgresql.org/docs/momjian/hw_performance/node11.html
> recommends 8k blocksize for the filesystem which is same as the page size.
>
> On linux ext2 fs (on my server) 4096 is the default blocak size and 8192 bytes
> is not supported.
>
> but man mkfs.ext2 on linux mentions an option -T which is:
> -T fs-type
>               Specify  how  the filesystem is going to be used, so that mke2fs can chose optimal filesystem
parametersfor that 
>               use.  The supported filesystem types are:
>                   news        one inode per 4kb block
>                   largefile   one inode per megabyte
>                   largefile4  one inode per 4 megabytes
>
> is the above relevent as far as optimisation for filesystem for tables is concerned?
>
> Also for the pg_xlog drive is a particular block size more favourable then others?
>
>
> regds
> mallah.
>
>
>
>
>
>
> --
> Rajesh Kumar Mallah,
> Project Manager (Development)
> Infocom Network Limited, New Delhi
> phone: +91(11)6152172 (221) (L) ,9811255597 (M)
>
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>
>
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