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 <[email protected]> > 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 <[email protected]> > > 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 <[email protected]> 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 >> > >> >
