I've changed title.
When I connected 3rd USB-UAS device, uas module fails to probe it.
And when I connected 2 drives on the same USB interface card, it was OK. 

======== 1st drive (connect to C220 Chipset USB3.0 port================
[root@nas01 ~]# lsusb -t
/:  Bus 08.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
    |__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/14p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 4: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 4: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 7: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
====================================================

======= 2nd drive (connect USB interface board)
[root@nas01 ~]# lsusb -t
/:  Bus 08.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
    |__ Port 1: Dev 8, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
    |__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/14p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 4: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 4: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 7: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
===========================

======== 3rd drive (connect the other USB interface board)
[root@nas01 ~]# lsusb -t
/:  Bus 08.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
    |__ Port 1: Dev 8, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
    |__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/14p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 4: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 4: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 7: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
==========================

======= dmsg =======================================
[49732.767608] usb 4-2: new SuperSpeed USB device number 2 using xhci_hcd
[49732.780276] usb 4-2: New USB device found, idVendor=0584, idProduct=0276
[49732.780277] usb 4-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[49732.780277] usb 4-2: Product: RS-EC32-U31R RAID1
[49732.780278] usb 4-2: Manufacturer: RATOC Systems,Inc.
[49732.780278] usb 4-2: SerialNumber: 323116430132
[49732.782572] scsi host9: uas
[49733.182312] scsi 9:0:0:0: Direct-Access     HGST HDN 724040ALE640     MJAO PQ: 0 ANSI: 6
[49733.342896] sd 9:0:0:0: [sdh] 7813988353 512-byte logical blocks: (4.00 TB/3.64 TiB)
[49733.342898] sd 9:0:0:0: [sdh] 4096-byte physical blocks
[49733.342923] sd 9:0:0:0: Attached scsi generic sg8 type 0
[49733.348092] sd 9:0:0:0: [sdh] Write Protect is off
[49733.348094] sd 9:0:0:0: [sdh] Mode Sense: 43 00 00 00
[49733.348250] sd 9:0:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[49733.403398]  sdh:
[49733.464345] sd 9:0:0:0: [sdh] Attached SCSI disk
[49917.363085] usb 6-1: new SuperSpeed USB device number 8 using xhci_hcd
[49917.380709] usb 6-1: New USB device found, idVendor=0584, idProduct=0276
[49917.380710] usb 6-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[49917.380711] usb 6-1: Product: RS-EC32-U31R RAID1
[49917.380711] usb 6-1: Manufacturer: RATOC Systems,Inc.
[49917.380712] usb 6-1: SerialNumber: 323116430004
[49917.386379] scsi host10: uas
[49917.797680] scsi 10:0:0:0: Direct-Access     HGST HDN 724040ALE640     MJAO PQ: 0 ANSI: 6
[49918.052848] sd 10:0:0:0: [sdi] 7813988353 512-byte logical blocks: (4.00 TB/3.64 TiB)
[49918.052850] sd 10:0:0:0: [sdi] 4096-byte physical blocks
[49918.053104] sd 10:0:0:0: Attached scsi generic sg9 type 0
[49918.058097] sd 10:0:0:0: [sdi] Write Protect is off
[49918.058099] sd 10:0:0:0: [sdi] Mode Sense: 43 00 00 00
[49918.058340] sd 10:0:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[49918.058861] xhci_hcd 0000:04:00.0: ERROR Transfer event for disabled endpoint or incorrect stream ring
[49918.058889] xhci_hcd 0000:04:00.0: @000000040d397c80 00000000 00000000 1b000000 01038000
[49918.118610]  sdi: sdi1 sdi2
[49918.232854] sd 10:0:0:0: [sdi] Attached SCSI disk
[50167.344938] usb 7-1: new high-speed USB device number 2 using xhci_hcd
[50167.469127] usb 7-1: New USB device found, idVendor=0584, idProduct=0276
[50167.469129] usb 7-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[50167.469130] usb 7-1: Product: RS-EC32-U31R RAID1
[50167.469131] usb 7-1: Manufacturer: RATOC Systems,Inc.
[50167.469132] usb 7-1: SerialNumber: 3231164301C8
[50167.488805] kworker/3:1: page allocation failure: order:0, mode:0x2604001(GFP_NOIO|GFP_DMA|__GFP_COMP|__GFP_NOTRACK)
[50167.488810] CPU: 3 PID: 5034 Comm: kworker/3:1 Not tainted 4.9.7-201.fc25.x86_64 #1
[50167.488810] Hardware name: Dell Inc. XPS 8700/0KWVT8, BIOS A11 07/09/2015
[50167.488814] Workqueue: usb_hub_wq hub_event
[50167.488815]  ffffabe849edb440 ffffffffb23f442d ffffffffb2c50e30 0000000000000001
[50167.488817]  ffffabe849edb4c8 ffffffffb21cc6fa 02604001dfde90a0 ffffffffb2c50e30

[50167.488819]  ffffabe849edb468 ffff964d00000010 ffffabe849edb4d8 ffffabe849edb488
[50167.488822] Call Trace:
[50167.488826]  [<ffffffffb23f442d>] dump_stack+0x63/0x86
[50167.488829]  [<ffffffffb21cc6fa>] warn_alloc+0x13a/0x170
[50167.488831]  [<ffffffffb240af08>] ? find_next_bit+0x18/0x20
[50167.488833]  [<ffffffffb21cca82>] __alloc_pages_slowpath+0x2e2/0xc40
[50167.488835]  [<ffffffffb21cd636>] __alloc_pages_nodemask+0x256/0x2c0
[50167.488837]  [<ffffffffb2223525>] alloc_pages_current+0x95/0x140
[50167.488839]  [<ffffffffb222d33d>] new_slab+0x30d/0x790
[50167.488841]  [<ffffffffb222f232>] ___slab_alloc+0x3f2/0x540
[50167.488843]  [<ffffffffb2626afb>] ? xhci_segment_alloc.isra.25+0xfb/0x140
[50167.488845]  [<ffffffffb23f417d>] ? cpumask_next_and+0x2d/0x50
[50167.488847]  [<ffffffffb20e0148>] ? update_sd_lb_stats+0x108/0x510
[50167.488849]  [<ffffffffb222f3a0>] __slab_alloc+0x20/0x40
[50167.488850]  [<ffffffffb2230c18>] __kmalloc+0x188/0x1f0
[50167.488851]  [<ffffffffb2626afb>] ? xhci_segment_alloc.isra.25+0xfb/0x140
[50167.488853]  [<ffffffffb2626afb>] xhci_segment_alloc.isra.25+0xfb/0x140
[50167.488854]  [<ffffffffb2626b83>] xhci_alloc_segments_for_ring+0x43/0x100
[50167.488856]  [<ffffffffb2626cfe>] xhci_ring_alloc.constprop.34+0xbe/0x140
[50167.488857]  [<ffffffffb26279c2>] xhci_endpoint_init+0x182/0x580
[50167.488859]  [<ffffffffb2621b81>] xhci_add_endpoint+0x101/0x2a0
[50167.488861]  [<ffffffffb25ee381>] usb_hcd_alloc_bandwidth+0x1b1/0x320
[50167.488862]  [<ffffffffb25f2052>] usb_set_configuration+0x272/0x910
[50167.488865]  [<ffffffffb22e0383>] ? kernfs_activate+0x83/0xe0
[50167.488867]  [<ffffffffb22dfd1e>] ? kernfs_link_sibling+0x8e/0xc0
[50167.488868]  [<ffffffffb22e04c0>] ? kernfs_add_one+0xe0/0x130
[50167.488870]  [<ffffffffb25fd6be>] generic_probe+0x2e/0x80
[50167.488872]  [<ffffffffb25f423e>] usb_probe_device+0x2e/0x70
[50167.488874]  [<ffffffffb254be23>] driver_probe_device+0x223/0x430
[50167.488875]  [<ffffffffb254c1ac>] __device_attach_driver+0x8c/0x100
[50167.488876]  [<ffffffffb254c120>] ? __driver_attach+0xf0/0xf0
[50167.488879]  [<ffffffffb25498e7>] bus_for_each_drv+0x67/0xb0
[50167.488880]  [<ffffffffb254ba8d>] __device_attach+0xdd/0x160
[50167.488881]  [<ffffffffb254c263>] device_initial_probe+0x13/0x20
[50167.488883]  [<ffffffffb254acb2>] bus_probe_device+0x92/0xa0
[50167.488884]  [<ffffffffb2548813>] device_add+0x373/0x630
[50167.488886]  [<ffffffffb2519700>] ? random_poll+0x10/0x80
[50167.488887]  [<ffffffffb25e7515>] usb_new_device+0x275/0x490
[50167.488889]  [<ffffffffb25e9244>] hub_event+0xc54/0x15a0
[50167.488891]  [<ffffffffb20bc4f4>] process_one_work+0x184/0x430
[50167.488893]  [<ffffffffb20bc7ee>] worker_thread+0x4e/0x490
[50167.488894]  [<ffffffffb20bc7a0>] ? process_one_work+0x430/0x430
[50167.488895]  [<ffffffffb20bc7a0>] ? process_one_work+0x430/0x430
[50167.488897]  [<ffffffffb20c2579>] kthread+0xd9/0xf0
[50167.488899]  [<ffffffffb20c24a0>] ? kthread_park+0x60/0x60
[50167.488901]  [<ffffffffb281ded5>] ret_from_fork+0x25/0x30
[50167.488905] Mem-Info:
[50167.488908] active_anon:1889846 inactive_anon:244489 isolated_anon:0
                active_file:226589 inactive_file:1542707 isolated_file:0
                unevictable:0 dirty:1260 writeback:0 unstable:0
                slab_reclaimable:58786 slab_unreclaimable:26405
                mapped:7442 shmem:4140 pagetables:7304 bounce:0
                free:35879 free_pcp:1566 free_cma:0
[50167.488911] Node 0 active_anon:7559384kB inactive_anon:977956kB active_file:906356kB inactive_file:6170828kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:29768kB dirty:5040kB writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 8394752kB anon_thp: 16560kB writeback_tmp:0kB unstable:0kB pages_scanned:0 all_unreclaimable? no
[50167.488912] Node 0 DMA free:60kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15984kB managed:15896kB mlocked:0kB slab_reclaimable:0kB slab_unreclaimable:15836kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[50167.488915] lowmem_reserve[]: 0 3381 15921 15921 15921
[50167.488919] Node 0 DMA32 free:68336kB min:14336kB low:17920kB high:21504kB active_anon:2696kB inactive_anon:608kB active_file:22996kB inactive_file:3289864kB unevictable:0kB writepending:72kB present:3568408kB managed:3487532kB mlocked:0kB slab_reclaimable:92424kB slab_unreclaimable:2532kB kernel_stack:464kB pagetables:28kB bounce:0kB free_pcp:3068kB local_pcp:160kB free_cma:0kB
[50167.488922] lowmem_reserve[]: 0 0 12540 12540 12540
[50167.488924] Node 0 Normal free:75120kB min:53176kB low:66468kB high:79760kB active_anon:7556688kB inactive_anon:977348kB active_file:883360kB inactive_file:2880964kB unevictable:0kB writepending:4952kB present:13105152kB managed:12841308kB mlocked:0kB slab_reclaimable:142720kB slab_unreclaimable:87252kB kernel_stack:6096kB pagetables:29188kB bounce:0kB free_pcp:3196kB local_pcp:368kB free_cma:0kB
[50167.488927] lowmem_reserve[]: 0 0 0 0 0
[50167.488929] Node 0 DMA: 1*4kB (U) 1*8kB (U) 1*16kB (U) 1*32kB (U) 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 60kB
[50167.488936] Node 0 DMA32: 126*4kB (UME) 115*8kB (UME) 128*16kB (UME) 41*32kB (UME) 25*64kB (UME) 46*128kB (UME) 13*256kB (UME) 15*512kB (UME) 4*1024kB (ME) 2*2048kB (UM) 9*4096kB (M) = 68336kB
[50167.488946] Node 0 Normal: 976*4kB (UE) 1206*8kB (UE) 598*16kB (UMEH) 347*32kB (UEH) 179*64kB (UMH) 182*128kB (UME) 12*256kB (UMEH) 4*512kB (UMH) 1*1024kB (H) 0*2048kB 0*4096kB = 75120kB
[50167.488956] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[50167.488957] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[50167.488958] 1774049 total pagecache pages
[50167.488958] 576 pages in swap cache
[50167.488959] Swap cache stats: add 8614, delete 8038, find 22411/22681
[50167.488960] Free swap  = 8164800kB
[50167.488960] Total swap = 8196092kB
[50167.488961] 4172386 pages RAM
[50167.488961] 0 pages HighMem/MovableOnly
[50167.488962] 86202 pages reserved
[50167.488962] 0 pages cma reserved
[50167.488962] 0 pages hwpoisoned
[50167.488964] SLUB: Unable to allocate memory on node -1, gfp=0x2408001(GFP_NOIO|GFP_DMA|__GFP_ZERO)
[50167.488965]   cache: dma-kmalloc-512, object size: 512, buffer size: 512, default order: 2, min order: 0
[50167.488966]   node 0: slabs: 5, objs: 160, free: 0
[50167.488971] usb 7-1: can't set config #1, error -12
===============================