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Re: block oriented storage

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On Thu, 06 Jan 2022 15:54:10 +0000, Johannes Koehler wrote:
> I try to get more skills to know about the following relation:
> 
> (b) blocksize@filesystem 

The block size depends on your filesystem. Example of a good man-page 
might be to study the -b flag at the man-page of mke2fs. To see the block 
size of an existing ext*fs you can try something like:

 dumpe2fs /dev/sda1

As you probably understand, it is prefered to have a block size which is 
a multiple of 1 or bigger of the sector size.

> (c) pagesize@(linux kernel or file)

The page size is usually 4 kB, you can check if that is really the case 
on your system by doing:

cat /proc/1/smaps | grep PageSize

Again, for swapping performance, it is prefered to have a page size which 
is a multiple of 1 or bigger of the sector size.

One simple way to test you raw disk performance with different block 
sizes is to do:

dd if=/dev/sda of=/dev/null bs=512

dd if=/dev/sda of=/dev/null bs=1024

dd if=/dev/sda of=/dev/null bs=2048

dd if=/dev/sda of=/dev/null bs=4096

dd if=/dev/sda of=/dev/null bs=8192

...

For RAID systems you might want to compare the performance with different 
stripe sizes.

regards Henrik

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block oriented storage Johannes Koehler <jko@johannes-koehler.de> - 2022-01-06 15:54 +0000
  Re: block oriented storage Marco Moock <mo01@posteo.de> - 2022-01-06 19:57 +0100
  Re: block oriented storage Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> - 2022-01-07 07:04 +0000

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