FS question

[kunjuttan]

Hi all,
One of my servers filesystem is showing 98%.
/dev/vgsappep01/sappeplv
20889600 20538271 329808 98% /usr/sap/PEP

And here it is showing 20GB total size.
But when I am giving vgdisplay command,it is showing size equivalent to 25GB.How it happens..Below the vgdisplay output

VG Name /dev/vgsappep01
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 1
Open LV 1
Max PV 16
Cur PV 1
Act PV 1
Max PE per PV 12800
VGDA 2
PE Size (Mbytes) 32
Total PE 799
Alloc PE 799
Free PE 0
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

[Torsten.]

How about an lvdisplay -v ...

[kunjuttan]

LV Name /dev/vgsappep01/sappeplv
VG Name /dev/vgsappep01
LV Permission read/write
LV Status available/syncd
Mirror copies 0
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 25568
Current LE 799
Allocated PE 799
Stripes 0
Stripe Size (Kbytes) 0
Bad block on
Allocation strict
IO Timeout (Seconds) default

[Torsten.]

It's a guess only, but maybe the LVOL was extended in the past without running extendfs?

[kunjuttan]

no till date vg not extended..but vg is 25gb r88???

[Torsten.]

I would give extendfs a try.

[kunjuttan]

you r right..am also thinking in the same way...but anyway am going to do a vgextend of some 10GB.at that time I need to go for a extendfs...

[Bill Hassell]

lvextend simply makes the volume larger. It has nothing to do with files and directories. You have to inform the filesystem that there is more space available. The reverse is also true. lvreduce will make the volume smaller. The filesystem thinks that all the space is available so items like superblocks at the end of the lvol are gone and you'll get I/O errors as the filesystem code tries to read or write to the end of the filesystem.

While there is an extendfs, there is no reducefs. If you need to reduce a filesystem, you must backup the data, umount the filesystem, run lvreduce and then newfs. Finally, mount the empty filesystem and restore the data to the new lvol. If you have the Online JFS product, you would use fsadm to resize the filesystem both up and down without requiring a umount (lvextend and lvreduce are still required).

[Deepankar Panda]

Hi..,
yah.. you are thinking right. add some disk space about 10 GB as per your requirement then go for the file system extension, then with the one logic both of your problems will get resolved.
because File system bottle neck is never a good idea.. thanks

[kunjuttan]

Thts r88 Mr.Panda..But the thing is app team requires the fs to be extended 10GB more.In my scenario if I add more 10GB lun and if i go for an extendfs,the fs will get extend to 15GB r88????So first I need to confirm,is the 5GB space is available or not.Then i have to add 5GB more.