Beiträge von NCO

Hi,

A little question about FS final size, I looking for a method to build a FS with the exact size wanted (for example I want to have a ext4 fs with a size of exactly 300GB which is displayed on windows with this total size and not about 5 to 25 GB less).

My build is a raid of 2 3TB HDD in RAID1 -> Logical group -> Logical volumes -> ext4 fs

I tried to use base 2 sizes in LV to have a fs of the exact size I want but finally I loose space again (fs format ?)

Attachments :
LVs : a view of my LVs after I try to modify one with base 2 size
FS : a view of the fs generated by resizefs after I resized the LV in base 2 size
FS final : the result (same on windows board)

What component count in base 2 and what component count in base 10, there is reserved space in LV or in ext4 fs ???

I hope I was clear on the problem, I stay available for further informations.

Thanks in advance,

Nicolas

Hi everybody,

I've installed OVM since several months after a try of other free solutions like Freenas or xpenology (not really free but free in terms of money^^). In brief, I use an optiplex 780 (a Dell profesionnal computer of 2010) with 3 HDD inside (1 WD green of 3To for medias and 2x WD Red 3To in RAID 1 for backups ...). All works fine since I understand how does the system works and I know how to use OVM in command line.
All except a little problem with the sizes displayed by windows when I use my CIFS/SMB shares.

Indeed, when I copy some datas on my shares with OVM I see a really big difference between the "size" and the "size on disk" on properties of the folder i've copied. I know the concept of cluster size and how it change between filesystems but in this case the difference is very important. For example :

A folder with 931 files and 108 subfolders :
On the SMB/CIFS share (ext4 on a Logical Volume created in my RAID 1) I have a size of 2,12 GB and a size on disk of 2,76 GB
The same folder on my computer (NTFS partition on a SSD) I have a size of 2,12 GB and a size on disk of 2,12 GB (the difference is about some KB)

I need your help in order to know if this is normal or if this is an issue in relation with ext4, my RAID or the LVM system (in my opinion the difference is too important to be related with normal non-filling clusters). Sometimes, the size on disk is 2 times bigger than the theoric size.

Thanks all in advance for your help (sorry for my creepy english, I'm French)

Nicolas