Re: Mount and file system size issue

["bmoon" <bo@anthologysolutions.com>]

Reisers,

I have three questions related with this 4 months old issue.

- Still reiser2 or reiser4 do not support "on demand" bitmap read?
- What is the supporting block size on reiser2, and reiser4?
- I am going to build one big volume(LVM) out of 8 IDE disks and make
reiserfs on it.
  Where does the system write the meta data(super block, bitmap,..) into?
Will it copy the same meta data on each disk?

Thanks,

Bo
----- Original Message -----
From: "Oleg Drokin" <green@namesys.com>
Subject: Re: [reiserfs-list] Mount and file system size issue


> Hello!
>
>    reiserfs reading all of the bitmaps immediately and stick bitmaps in
the RAM.
>    So if reading all of the bitmaps on 120G volume, that means
>    reading 960 4k sectors off the media (each 32M there is bitmap on
disk).
>    That would eat at least 4 megabytes of RAM.
>    Actually if you can do a profiling to see what reiserfs does during
mounting,
>    that would be interesting.
>    Also you have not answered what kind of media you are using.
>
>    ext2/3 read bitmap blocks on demand on the other side.
>
>