> On Tue, Jun 10, 2008 at 11:33:36AM -0700, Wyllys > Ingersoll wrote: > > Im running build 91 with ZFS boot. It seems that > ZFS will not allow > > me to add an additional partition to the current > root/boot pool > > because it is a bootable dataset. Is this a known > issue that will be > > fixed or a permanent limitation? > > The current limitation is that a bootable pool be > limited to one disk or > one disk and a mirror. When your data is striped > across multiple disks, > that makes booting harder. > > >From a post to zfs-discuss about two months ago: > > ... we do have plans to support booting from > RAID-Z. The design is > still being worked out, but it's likely that it > will involve a new > kind of dataset which is replicated on each disk of > the RAID-Z pool, > and which contains the boot archive and other > crucial files that the > booter needs to read. I don't have a projected > date for when it will > be available. It's a lower priority project than > getting the install > support for zfs boot done. > - > Darren
If I read you right, with little or nothing extra, that would enable growing rpool as well, since what it would really do is ensure /boot (and whatever if anything else) was mirrored even though the rest of the zpool was raidz or raidz2; which would also ensure that those critical items were _not_ spread across the stripe that would result from adding devices to an existing zpool. Of course installation and upgrade would have to be able to recognize and deal with such exotica too. Which seems to pose a problem, since having one dataset in the zpool mirrored while the rest is raidz and/or extended by a stripe implies to me that some space is more or less reserved for that purpose, or that such a dataset couldn't be snapshotted, or both; so I suppose there might be a smaller-than-total-capacity limit on the number of BEs possible. http://en.wikipedia.org/wiki/TANSTAAFL ... This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
