Merci pour ta réponse.
Alors, le bash_history est dans le /home/ ^^
impossible de retrouver le /home :’( :
lrwxrwxrwx 1 root root 7 oct. 25 18:35 /dev/mapper/2DB–vg-home -> …/dm-4
brw-rw---- 1 root disk 254, 4 oct. 25 18:35 dm-4
voilà la seule info que j’ai :
Avant :
Size of logical volume 2DB-vg/home changed from 903,73 GiB (231355 extents) to 703,73 GiB (180155 extents).
Logical volume home successfully resized
Size of logical volume 2DB-vg/var changed from 2,79 GiB (715 extents) to 42,79 GiB (10955 extents).
Logical volume var successfully resized
Après :
lvdisplay /dev/mapper/2DB–vg-home
— Logical volume —
LV Path /dev/2DB-vg/home
LV Name home
VG Name 2DB-vg
LV UUID 0ES16q-JNYq-F2sn-fSfv-PaYT-ewLl-1fvkNz
LV Write Access read/write
LV Creation host, time 2DB, 2016-03-23 14:37:48 +0100
LV Status available
# open 0
LV Size 703,73 GiB
Current LE 180155
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:4
LV Path /dev/2DB-vg/var
LV Name var
VG Name 2DB-vg
LV UUID dB3ut4-hIj1-2LEc-RT64-33oI-dHiV-T3CV4E
LV Write Access read/write
LV Creation host, time 2DB, 2016-03-23 14:37:48 +0100
LV Status available
# open 1
LV Size 42,79 GiB
Current LE 10955
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:2
Je ne sais pas si ces infos servent 
Merci à vous !