On Wed, 14 Nov 2012, Ronald F. Guilmette wrote:
(And I gather from everything that has been said
so far in this thread that if the alignment is set wrong, then the user
is likely to pay a Big Price in terms of performance, right?)
Yes.
... and I am almost tempted to file a formal PR about this, i.e. the fact
that ``guided'' partitioning doesn't allow the user to specify the alignment
of _anything_.
There are a couple PRs like that already.
Or do I need to set the alignment separately, e.g. my manually running
bsdlabel? (Normally, I've just been using what noadays is being
called "guided" partitioning, you know, with the friendly curses-based
GUI. So As with fdisk, I have no real experience using bsdlabee from
teh command line. But I guess it is time that i learned how.)
I don't know of a way to make fdisk and bsdlabel do the correct
alignment.
That also is rather entirely perplexing to me, especially given all else
that I have learned already from and within this conversation.
fdisk and bsdlabel are old tools. Disks have had 512-byte blocks for a
very long time.
For example, I've learned that when one is using modern "Advanced
Format) (4KB blocksize) hard disks, it is Bad (capital `B') to allow
any partition to be aligned to anything other than (at least) a 4KB
boundary, _and_ that newfs has already, apparently been modified/updated
so that it's minimum default fragment size is 4KB.
The larger size was an option to newfs, the defaults have just been
changed.
Given these facts, I am more than a little surpised to learn (or rather
just to realize) that the good old traditional fdisk and bsdlabel tools
do not have ways to explicitly specify minimum alignment _and_ that
these tools are still being distributed with FreeBSD.
There may be a way, I haven't bothered to look. As I said, gpart does
everything fdisk and bsdlabel can do.
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