Is there some utility, that, given a file system with real data on it,
will compute the optimum file system block size for that data set?
If not, is it a reasonable assumption that the space allocated to a file
will be the file's data size, rounded up to the fragment size?
On Fri, 11 May 2012 12:48:08 +0200
Edgar Fuß e...@math.uni-bonn.de wrote:
Edgar is describing the desideratum for a minimum-latency
application.
Yes, I'm looking for minimum latency.
I've logged the current file server's disc business and the only
time they really are busy is during the
Thanks a lot for your detailed answers.
Yes. Absolutely.
Fine.
As you can see, all of those span all 4 discs.
Yes, that was perfectly clear to me. What I wasn't sure of was that the
whole stack of subsystems involved would really be able to make use of that.
Thanks for confirming it actually
I'm assuming you're talking FFS here.
Ah, sorry, yes, I'm talking of FFS.
at least if you ignore the space used by the inode.
I guess I can indeed ignore inodes because the space occupied by them doesn't
vary with fsbsize, or does it?
For files large enough to need indirect blocks,
(a) the
at least if you ignore the space used by the inode.
I guess I can indeed ignore inodes because the space occupied by them
doesn't vary with fsbsize, or does it?
I think you're right that an inode's size is independent of the
filesystem's blocksize; possibly also relevant is that inode space is
On Fri, 11 May 2012, Edgar Fu? wrote:
EF I have one process doing something largely resulting in meta-data
EF reads (i.e. traversing a very large directory tree). Will the kernel
EF only issue sequential reads or will it be able to parallelise, e.g.
EF reading indirect blocks?
GO I don't
On Fri, 11 May 2012 17:05:24 +0200
Edgar Fuß e...@math.uni-bonn.de wrote:
Thanks a lot for your detailed answers.
Yes. Absolutely.
Fine.
As you can see, all of those span all 4 discs.
Yes, that was perfectly clear to me. What I wasn't sure of was that
the whole stack of subsystems
Does that help?
Yes, thanks!
Yet another question: Suppose I have 4k fsbsize and a stripe size such that
16k go to one disc (i.e. 64k stripes with my 4+1 RAID 5 example).
Will RAIDframe ever deal with less than 16k? I.e.:
A. I read one 4k fs block. Will RAIDframe read 4k or 16k from the disc?
