Eureka! la solution est ici:
EDIT: hélas non, (cf plus bas)
https://memo-linux.com/comment-monter-une-partition-lvm-dun-disque-externe-sous-linux/
C’est vgchange -ay /dev/seagateUSB4T
# vgchange -ay /dev/seagateUSB4T
2 logical volume(s) in volume group "seagateUSB4T" now active
root@pclf-w970suw:~# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv_clone VG_1 -wi-a----- 40,00g
lv_home VG_1 -wi-ao---- 836,26g
lv_tmp VG_1 -wi-a----- 3,72g
CD seagateUSB4T -wi-a----- 1000,00g
bkp seagateUSB4T -wi-a----- 2,05t
Suite:
En suivant la méthode indiquée, je retrouve des messages d’erreur (unable to read superblock):
dmesg affiche:
[220589.487721] broken atomic modeset userspace detected, disabling atomic
[231092.501110] usb 4-2: new SuperSpeed Gen 1 USB device number 11 using xhci_hcd
[231092.522188] usb 4-2: New USB device found, idVendor=0bc2, idProduct=231a, bcdDevice= 7.12
[231092.522192] usb 4-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[231092.522194] usb 4-2: Product: Expansion
[231092.522195] usb 4-2: Manufacturer: Seagate
[231092.522197] usb 4-2: SerialNumber: NAAX94EB
[231092.526507] scsi host7: uas
[231092.527108] scsi 7:0:0:0: Direct-Access Seagate Expansion 0712 PQ: 0 ANSI: 6
[231092.527958] sd 7:0:0:0: Attached scsi generic sg3 type 0
[231099.075447] sd 7:0:0:0: [sdd] 7814037167 512-byte logical blocks: (4.00 TB/3.64 TiB)
[231099.075452] sd 7:0:0:0: [sdd] 4096-byte physical blocks
[231099.075637] sd 7:0:0:0: [sdd] Write Protect is off
[231099.075640] sd 7:0:0:0: [sdd] Mode Sense: 53 00 00 08
[231099.076031] sd 7:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[231099.076407] sd 7:0:0:0: [sdd] Optimal transfer size 33553920 bytes not a multiple of physical block size (4096 bytes)
[231099.194517] sdd: sdd1
[231099.195945] sd 7:0:0:0: [sdd] Attached SCSI disk
[231714.817121] Buffer I/O error on dev dm-3, logical block 550502384, async page read
[231714.820192] Buffer I/O error on dev dm-4, logical block 262143984, async page read
[231714.871576] Buffer I/O error on dev dm-3, logical block 550502384, async page read
[231714.871769] Buffer I/O error on dev dm-4, logical block 262143984, async page read
[231851.715099] Buffer I/O error on dev dm-3, logical block 550502384, async page read
[231851.715845] Buffer I/O error on dev dm-4, logical block 262143984, async page read
[231873.208440] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208472] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208478] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208483] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208487] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208491] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208496] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208500] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208504] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.208508] Buffer I/O error on dev dm-4, logical block 0, async page read
[231873.222172] sdd: sdd1
[232057.146885] buffer_io_error: 16 callbacks suppressed
[232057.146927] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.146974] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.146991] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.147013] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.147035] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.147076] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.147098] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.147120] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.147141] Buffer I/O error on dev dm-3, logical block 0, async page read
[232057.147179] Buffer I/O error on dev dm-3, logical block 1, async page read
[232078.875279] buffer_io_error: 15 callbacks suppressed
[232078.875281] Buffer I/O error on dev dm-3, logical block 550502384, async page read
[232078.875780] Buffer I/O error on dev dm-4, logical block 262143984, async page read
[232091.425135] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425148] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425154] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425160] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425165] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425170] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425175] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425180] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425186] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.425191] Buffer I/O error on dev dm-4, logical block 0, async page read
[232091.440113] sdd: sdd1
[232194.996120] buffer_io_error: 16 callbacks suppressed
[232194.996123] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996144] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996169] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996180] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996190] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996201] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996212] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996222] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996232] Buffer I/O error on dev dm-3, logical block 0, async page read
[232194.996243] Buffer I/O error on dev dm-3, logical block 1, async page read
[232211.869551] buffer_io_error: 15 callbacks suppressed
[232211.869554] Buffer I/O error on dev dm-4, logical block 262143984, async page read
[232211.869568] Buffer I/O error on dev dm-3, logical block 550502384, async page read
[236055.906693] Buffer I/O error on dev dm-4, logical block 262143984, async page read
[236055.906885] EXT4-fs (dm-4): unable to read superblock
[236055.906956] EXT4-fs (dm-4): unable to read superblock
[236055.907012] EXT4-fs (dm-4): unable to read superblock
En bref:
sudo mount /dev/seagateUSB4T/CD /media /seagateUSB4T_CD/
mount: /media/seagateUSB4T_CD: impossible de lire le superbloc à l’adresse /dev/mapper/seagateUSB4T-CD