Re: New Linux xfs/reiser file systems

mlw wrote:<br /><blockquote cite="mid:3AF2200D.922E5723@mohawksoft.com" type="cite"><pre wrap="">Bruce Momjian
wrote:<br/></pre><blockquote type="cite"><blockquote type="cite"><pre wrap="">Just put a note in the installation docs
thatthe place where the database<br />is initialised to should be on a non-Reiser, non-XFS mount...<br
/></pre></blockquote><prewrap="">Sure, we can do that now.  What do we do when these are the default file<br />systems
forLinux?  We can tell them to create other types of file<br />systems, but that is a pretty big hurdle.  I wonder if
itwould be<br />easier to get reiser/xfs to make some modifications.<br /></pre></blockquote><pre wrap=""><br /><br />I
havelooked at Reiser, and I don't think it is a file system suited for very<br />large files, or applications such as
postgres.The Linux crowd should lobby<br />against any such trend. It is ok for many moderately small files.
ReiserFS<br/>would be great for a cddb server, but poor for a database box.<br /><br />XFS is a real big file system
project,I'd bet that there are file properties<br />or management tools to tell it to leave directories and files
alone.They<br />should have addressed that years ago.<br /><br />One last mention..<br /><br />Having better control
overWHERE various files in a database are located can<br />make it easier to deal with these things.</pre></blockquote>
Ithink it's worth noting that Oracle has been petitioning the kernel developers for better raw device support: in other
words,the ability to write directly to the hard disk and bypassing the filesystem all together.   <br /><br /> If the
dbis going to assume the responsibility of disk write verification it seems reasonable to assume you might want to
investigatethe raw disk i/o options.<br /><br /> Telling your installers that a major performance gain is attainable by
doingso might be a start in the opposite direction.   I've monitored a lot of discussions and from what I can gather,
postgresqldoes it's own set of journaling operations.  I don't think that it's necessary for writes to be double
journalledanyway.<br /><br /> Again, just my two cents worth...<br />