Hello,
I have question about space recelamation. I think that I have very low efficency in my enviroment, and I don't why.
I have many CentOS guests (versions 6 and 7). There I have ext4 (on v6) and xfs (on v7) with LVM partitions.
I try it on ESXi 6.5 and 6.7U1. Guest VM HW is version 13. Datastores are VMFS6.
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/lvmgr-root 25G 21G 5.0G 81% /
/dev/mapper/lvmgr-www 197G 128G 69G 66% /www
/dev/mapper/lvmgr-tmp 1014M 33M 982M 4% /tmp
/dev/sda1 497M 177M 321M 36% /boot
So there is about 149GB used. Here is how VHDD are orderly.
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K 0 disk
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 39.5G 0 part
├─lvmgr-root 253:0 0 25G 0 lvm /
├─lvmgr-swap 253:1 0 2G 0 lvm [SWAP]
├─lvmgr-www 253:2 0 196.5G 0 lvm /www
└─lvmgr-tmp 253:3 0 1G 0 lvm /tmp
sdb 8:16 0 40G 0 disk
└─lvmgr-www 253:2 0 196.5G 0 lvm /www
sdc 8:32 0 15G 0 disk
└─lvmgr-root 253:0 0 25G 0 lvm /
sdd 8:48 0 50G 0 disk
└─lvmgr-www 253:2 0 196.5G 0 lvm /www
sde 8:64 0 40G 0 disk
└─sde1 8:65 0 40G 0 part
└─lvmgr-www 253:2 0 196.5G 0 lvm /www
sdf 8:80 0 40G 0 disk
├─sdf1 8:81 0 20G 0 part
│ └─lvmgr-www 253:2 0 196.5G 0 lvm /www
├─sdf2 8:82 0 10G 0 part
│ └─lvmgr-www 253:2 0 196.5G 0 lvm /www
└─sdf3 8:83 0 10G 0 part
└─lvmgr-www 253:2 0 196.5G 0 lvm /www
sr0 11:0 1 1024M 0 rom
Storage usage from VCenter say 185GB. So there is about 36GB diff. Why? I have VMs there difference is much bigger.
"fstrim", zeroed free space, discard in fstab is without some effect.
Any hint for this?
Thanks
Pavel
