Unless you are serving mail via imap or pop, it is generally considered safe.
On Sun, Oct 11, 2009 at 1:11 AM, Stas Oskin <stas.os...@gmail.com> wrote: > Hi. > > By the way, about the noatime - is it safe just to set this for all > partitions used, including / and boot? > > Thanks. > > 2009/10/9 Stas Oskin <stas.os...@gmail.com> > > > Hi. > > AFAIK, this space is reserved for root logs, in case the filesystem is > > full, so the kernel won't crash. > > > > From what I seen, it has to be only enabled on the root partition, the > data > > partitions it can be safely set to 0. > > > > I usually leave the default 5% on root, boot and swap (as the space > savings > > there insignificant), and set to 0 on data partition, where it really > gives > > back the 50-60 GB mentioned below. > > > > Regards. > > > > > > 2009/10/9 Edward Capriolo <edlinuxg...@gmail.com> > > > > On a 1tb disk reducing reserved space from 5 to 2 saves almost 30 gb. > >> Cutting the inodes down saves you some space but not nearly as much. > >> Say 10 gb. > >> > >> The differnce is once you format your disk you can't change the inode > >> numbers. Tunefs can tune reserved blocks while the disk is mounted. > >> > >> I did reserved space with tunefs -m2 > >> , Noatime then moved on. > >> > >> On 10/9/09, stephen mulcahy <stephen.mulc...@deri.org> wrote: > >> > paul wrote: > >> >> Check out the bottom of this page: > >> >> > >> >> http://wiki.apache.org/hadoop/DiskSetup > >> > > >> > Just re-reading that page, two suggestions that may not be > appropriate, > >> > > >> > 1. Reducing reserved space to 0. AFAIK, ext3 needs a certain amount of > >> > free space to function properly - the man page for mke2fs suggests > that > >> > this reserved space is used for defragmentation, as well as being > >> > emergency space reserved for root. A quick Google doesn't turn up > >> > anything more definitive, but setting it to 0 is a bad idea afaics. > >> > > >> > 2. Reducing the number of inodes. This is a good idea, if you are > >> > really, really sure that nothing will create small files on that > >> > partition. Unless you are absolutely certain of this, I would not > change > >> > from the default - I'm not clear on how much of an overall saving > you'll > >> > make and the downside to running to running out of inodes is that you > >> > start getting "out of space" errors when you try to write to that disk > >> > (despite df showing you loads of free space), so again, I'm not sure > I'd > >> > recommend this one. > >> > > >> > -stephen > >> > > >> > -- > >> > Stephen Mulcahy, DI2, Digital Enterprise Research Institute, > >> > NUI Galway, IDA Business Park, Lower Dangan, Galway, Ireland > >> > http://di2.deri.ie http://webstar.deri.ie http://sindice.com > >> > > >> > > > -- Pro Hadoop, a book to guide you from beginner to hadoop mastery, http://www.amazon.com/dp/1430219424?tag=jewlerymall www.prohadoopbook.com a community for Hadoop Professionals
