ZFS already aligns the beginning of data areas to 4KB offsets from the label. For modern OpenSolaris and Solaris implementations, the default starting block for partitions is also aligned to 4KB.
On Oct 5, 2010, at 6:36 PM, Michael DeMan wrote: > Hi upfront, and thanks for the valuable information. > > > On Oct 5, 2010, at 4:12 PM, Peter Jeremy wrote: > >>> Another annoying thing with the whole 4K sector size, is what happens >>> when you need to replace drives next year, or the year after? >> >> About the only mitigation needed is to ensure that any partitioning is >> based on multiples of 4KB. > > I agree, but to be quite honest, I have no clue how to do this with ZFS. It > seems that it should be something under the regular tuning documenation. Disagree. Starting alignment is not a problem OOB. You have to go out of your way to make the starting alignments not be 4KB aligned. > > http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide > > http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide > > > Is it going to be the case that basic information like about how to deal with > common scenarios like this is no longer going to be publicly available, and > Oracle will simply keep it 'close to the vest', with the relevant information > simply available for those who choose to research it themselves, or only > available to those with certain levels of support contracts from Oracle? > > To put it another way - does the community that uses ZFS need to fork 'ZFS > Best Practices' and 'ZFZ Evil Tuning' to ensure that it is reasonably up to > date? ZFS Best Practices and Evil Tuning Guide are not hosted by Oracle. They are hosted at the SolarisInternals.com site. -- richard -- OpenStorage Summit, October 25-27, Palo Alto, CA http://nexenta-summit2010.eventbrite.com ZFS and performance consulting http://www.RichardElling.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
