[EMAIL PROTECTED] writes:
> (Removed Sun-managers because that's not a discussion list)
>
>
> >In fact, their tools i.e. lspv etc etc showed clearly the PP layout on
> >the physical disk.
>
> Solaris never really liked more than 8 physical partitions on a disk;
> this AIX mechanism looks like something you'd do when disks are huge
> and few and far between. And not when the basic unit of storage is a
> single disk, which is more like tthe situation we have today.
I'm not sure I completely agree with that. AIX's PP facility is not
really like Solaris' use of physical partitions at all.
Instead, PPs on AIX are a way to segment storage on a single disk so
that you can grow LVs when you need to and without dedicating storage
to them ahead of time.
This is something Solaris hasn't had in the past. LVs on AIX are
roughly the same thing as slices ('partitions') on Solaris. The
difference is that on Solaris, if you grow partitions at all, the
growth must be in contiguous cylinders. AIX has one more level of
redirection here that allows you to grow the LV on the fly from a pool
of free PPs, which needn't be contiguous. (The only limitation in LVM
is that chunks are at least 1/1016 the disk size.)
Interestingly, you can safely grow it while the system is in use.
Back when I used AIX, I would frequently watch df output while
installing some big software package, and frantically type "sudo chfs
-a size=+1 /usr" when I saw that it was running low. That causes the
file system to grow, which forces the LV to grow underneath, and that
causes a new PP to be added.
> >I can find no Solaris equivalent of this feature. And I am curious as to
> >how Solaris treats the above or what Sun thinks of the above AIX treatment.
>
> There isn't.
>
> ZFS makes this discussion moot in the sense that the data from multiple
> filesystems will be spread throughout the storage pool.
Yep.
--
James Carlson, KISS Network <[EMAIL PROTECTED]>
Sun Microsystems / 1 Network Drive 71.232W Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677
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