USB3.0でやられた
Ubuntu18.04LTSで動いていたPCに、いままでUSB3.0のポータブルHDDを１２台繋いで、17TBを確保していたのですが、そこへ4TBx4を繋いだら、
[ 98.155725] xhci_hcd 0000:00:14.0: Error while assigning device slot ID
[ 98.156051] xhci_hcd 0000:00:14.0: Max number of devices this xHCI host supports is 32.
[ 98.156399] usb usb2-port4: couldn't allocate usb_device
と言われてしまいました
で説明があるように、96endpoint / 3endpoint = 32deviceが最大値なのね。
また、
[ 97.566061] scsi 19:0:0:0: Direct-Access WD My Passport 25E2 4005 PQ: 0 ANSI: 6
[ 97.567823] scsi 19:0:0:1: Enclosure WD SES Device 4005 PQ: 0 ANSI: 6
[ 97.572629] sd 19:0:0:0: Attached scsi generic sg24 type 0
[ 97.572844] sd 19:0:0:0: [sds] Very big device. Trying to use READ CAPACITY(16).
[ 97.573270] sd 19:0:0:0: [sds] 7813969920 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 97.573283] sd 19:0:0:0: [sds] 4096-byte physical blocks
[ 97.573357] ses 19:0:0:1: Attached Enclosure device
[ 97.573898] sd 19:0:0:0: [sds] Write Protect is off
[ 97.573910] ses 19:0:0:1: Attached scsi generic sg25 type 13
[ 97.573914] sd 19:0:0:0: [sds] Mode Sense: 47 00 10 08
[ 97.574535] sd 19:0:0:0: [sds] No Caching mode page found
[ 97.574825] sd 19:0:0:0: [sds] Assuming drive cache: write through
[ 97.576108] ses 19:0:0:1: Wrong diagnostic page; asked for 1 got 8
[ 97.576426] ses 19:0:0:1: Failed to get diagnostic page 0x1
[ 97.576679] ses 19:0:0:1: Failed to bind enclosure -19
[ 97.588934] sds: sds1
[ 97.592901] sd 19:0:0:0: [sds] Attached SCSI disk
とログが出ている通り、ポータブルHDD１個に２個デバイスがある状態ですし、
lsusbは以下の通り。
root@localhost:~# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
|__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M
|__ Port 1: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 2: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 3: Dev 5, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 4: Dev 6, If 0, Class=Hub, Driver=hub/4p, 5000M
|__ Port 3: Dev 9, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 1: Dev 7, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 4: Dev 10, If 0, Class=Hub, Driver=hub/4p, 5000M
|__ Port 4: Dev 14, If 0, Class=Hub, Driver=hub/4p, 5000M
|__ Port 3: Dev 16, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 1: Dev 15, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 4: Dev 17, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 2: Dev 12, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 3: Dev 13, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 1: Dev 11, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 2: Dev 8, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/7p, 480M
|__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 4, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 6, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 9, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 2: Dev 10, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 3: Dev 11, If 0, Class=Wireless, Driver=btusb, 12M
|__ Port 3: Dev 11, If 1, Class=Wireless, Driver=btusb, 12M
|__ Port 4: Dev 5, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 8, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 5: Dev 7, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 2: Dev 12, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 1: Dev 13, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 2: Dev 14, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 3: Dev 15, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 16, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 2: Dev 18, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 1: Dev 17, If 0, Class=Mass Storage, Driver=usb-storage, 480M
root@localhost:~#
というわけで、一番簡単なのは、usb2.0として使えば 127endpointになるよってことみたい。
尚、
PCは
https://www.amazon.co.jp/dp/B07GN7SVY6/ref=cm_sw_em_r_mt_dp_U_hbCHDb32PW0S2 なので、PCIeでrootを増やすとか無理だし、
さてどうしようかな
ちなみにUSB HUB１個目は https://www.amazon.co.jp/gp/product/B00JWMLYUC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
USB HUB ２個目は
https://www.amazon.co.jp/dp/B07QPDBX5L/ref=cm_sw_em_r_mt_dp_U_XfCHDbBDYNX5D
です
