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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!menudo.uh.edu!navier.math.uh.edu!mcbryde
- From: mcbryde@navier.math.uh.edu (Jack Mcbryde)
- Newsgroups: comp.unix.aix
- Subject: Re: disk space
- Date: 22 Jan 1993 04:29:45 GMT
- Organization: UH Dept of Math
- Lines: 92
- Message-ID: <1jnt7pINNdp6@menudo.uh.edu>
- References: <1993Jan22.003726.17271@sobeco.com>
- NNTP-Posting-Host: navier.math.uh.edu
- Keywords: disk vg lv df
-
- In article <1993Jan22.003726.17271@sobeco.com> emillion@sobeco.com (E.J.Millions) writes:
- >I recently added a disk to an existing volume group and am somewhat
- >puzzled by the difference between df and lslv, as follows
- >
- >% df
- >Filesystem Total KB free %used iused %iused Mounted on
- >/dev/lv04 2097152 865984 58% 15372 2% /mounts/b
- >% lslv lv04
- >LOGICAL VOLUME: lv04 VOLUME GROUP: vg03
- >...
- >MAX LPs: 600 PP SIZE: 4 megabyte(s)
- >COPIES: 1 SCHED POLICY: parallel
- >LPs: 568 PPs: 568
- >...
- >MOUNT POINT: /mounts/b LABEL: /mounts/b
- >
- >Perhaps it is simply that I'm tired and it's time to go home, but
- >the last time I checked 2,097 Meg was not equivalent to 4x568=2,272 Meg.
-
- Looks like the 2Gb filesystem limit may have gotten you. I don't know anyway
- to reclaim the space other than deleting the filesystem and logical volume
- and recreating it the easy foolproof way. (There may be one, I just don't
- know it.)
-
- This is for lots of people out there. Unless you want to do stuff with things
- like raw partitions there is *no* reason to screw around with logical volumes
- in order to create/enlarge filesystems. (Except to change the maximum number
- of physical partitions.) All it does is mess people up.
-
- Here is the simple foolproof way to do it:
- For a filesystem <= .5Gb with the disk already in the volume group:
- smitty
- Physical & Logical Storage
- File Systems
- Add / Change / Show / Delete File Systems
- Journaled File Systems
- Add a Journaled File System
- or
- Change / Show Characteristics of a Journaled File System
- (if it already exists)
-
- To add a new disk to a volume group:
- smitty
- Physical & Logical Storage
- Logical Volume Manager
- Volume Groups
- Set Characteristics of a Volume Group
- Add a Physical Volume to a Volume Group
-
- To modify the default .5Gb limit:
- smitty
- Physical & Logical Storage
- Logical Volume Manager
- Logical Volumes
- Set Characteristic of a Logical Volume
- Change a Logical Volume
- LOGICAL VOLUME name (use F4)
- change the line that says
- MAXIMUM NUMBER of LOGICAL PARTITIONS
- to 512 (this gives you the 2Gb limit)
-
- If you do things this way you will never have to count the physical partition,
- you will never have mismatched amount of disk allocated to a logical volume
- and its corresponding filesystem, and you will spend less time messing
- around in smit. Don't make it harder than it needs to be. Most of the IBMer's
- I've seen do this strange crap with allocating more physical partitions to
- a logical volume before they try to enlarge a filesystem. It's not necessary.
-
- What I do is stick a disk into a volume group. (It's own if I can get away
- with it. But that's another story.) Then if I need a new filesystem, I add
- a filesystem. (as in first set of menus) If I need it to be larger (but
- less than .5Gb) I follow the first set of menus. smit takes care of all of
- the underlying logical volume stuff for you. If I need it to be larger than
- .5Gb then I follow the second set of menus (and I always change it it 512,
- that way I never have to do it again - this is just resetting the maximum
- possible size it doesn't use up space) followed by the first.
-
- BTW, any irritation that may be detected on my part is not with you or any
- in particular individual. I just get so tired of watching people making
- the logical volume manager more complicated and messy than it needs to be.
- I suspect that IBM is responsible whether it be by virtue of classes, unclear
- documentation, or SE's. Then again maybe it has do do with a Sun mindset
- where you have to preallocate all of your disk before you can possibly really
- know where it is going to need to go. Gack!
-
- later,
- jack
- --
- jack mcbryde@karazm.math.uh.edu * All I ask of Thee, Lord
- * Christ died for our sins. Dare we * Is to be a drinker and fornicator
- * make his martyrdom meaningless by * An unbeliever and a sodomite
- * not committing them? - Jules Feiffer * And then to die. - Claude de Chauvigny
-