What James Stracka said is correct: There is a 5% reserve on most Unix (POSIX or Linux) filesystems which is set aside so that the system will not come to a halt if a rogue program fills it up. Oh ... and it's not always 5%; it can vary.
In English: When a disk is "100% full", root can still write stuff. 'df' shows you what is available to non-root mortals. There are other places where the storage gets burned up in overhead. To one point, the number 850K/cyl is wrong. On a 3390 with 4K blocks (which is what Linux will use and what CMS *usually* uses for 3390s) you get 720K/cyl, 180 blocks at 4K. On Thu, Feb 21, 2008 at 11:06 AM, Troy A Slaughter <[EMAIL PROTECTED]> wrote: > > I'm wondering if anyone else has experienced this issue. > > I'm building Redhat 5.1 linux servers under VM. I usually define the > server's minidisk under VM to accommodate the / filesystem under linux. > Unless I'm wrong, the specs are 850 K/Cyl(3390s). I do the math and > create the minidisk for the / directory under Linux. I get it installed and > do a 'df' command to see filesystem usage/size. I noticed that the total > filesystem space results are less than what I expected to see. I know that > during Linux installation, the minidisk is linux-formatted. Is that where > I'm losing disk space? Is there a formula I can use to account for this? > > * > > _______________________________________________________________________________ > Troy Slaughter | Software Consultant | Mainframe Support and Deployment * > 840 South Canal, Chicago, Illinois, 60607 | Phone 312-557-6322 | Cell > 312-208-3735 | [EMAIL PROTECTED] * <[EMAIL PROTECTED]> > Please visit *northerntrust.com* <http://www.northerntrust.com/> > > CONFIDENTIALITY NOTICE: This communication is confidential, may be > privileged and is meant only for the intended recipient. If you are not the > intended recipient, please notify the sender ASAP and delete this message > from your system. > > IRS CIRCULAR 230 NOTICE: To the extent that this message or any attachment > concerns tax matters, it is not intended to be used and cannot be used by a > taxpayer for the purpose of avoiding penalties that may be imposed by law. > For more information about this notice, see * > http://www.northerntrust.com/circular230*<http://www.northerntrust.com/circular230> > > P Please consider the environment before printing this e-mail. > -- -- R; <><
