How to open more than 255 mhvtl dev

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How to open more than 255 mhvtl dev

henrychen
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Re: How to open more than 255 mhvtl dev

henrychen
more detail:
OS:centos 6.5    

device. config:

Drive: 253 CHANNEL: 22 TARGET: 0 LUN: 3
 Library ID: 250 Slot: 3
 Vendor identification: HP
 Product identification: Ultrium 5-SCSI
 Product revision level: N11G
 Unit serial number: 8100213
 NAA: 250:11:22:33:ab:22:0:3
 Compression: factor 1 enabled 1
 Compression type: lzo
 Backoff: 400

Drive: 254 CHANNEL: 22 TARGET: 0 LUN: 4
 Library ID: 250 Slot: 4
 Vendor identification: HP
 Product identification: Ultrium 5-SCSI
 Product revision level: N11G
 Unit serial number: 8100214
 NAA: 250:11:22:33:ab:22:0:4
 Compression: factor 1 enabled 1
 Compression type: lzo
 Backoff: 400

Drive: 255 CHANNEL: 22 TARGET: 0 LUN: 5
 Library ID: 250 Slot: 5
 Vendor identification: HP
 Product identification: Ultrium 5-SCSI
 Product revision level: N11G
 Unit serial number: 8100215
 NAA: 250:11:22:33:ab:22:0:5
 Compression: factor 1 enabled 1
 Compression type: lzo
 Backoff: 400

Drive: 256 CHANNEL: 22 TARGET: 0 LUN: 6
 Library ID: 250 Slot: 6
 Vendor identification: HP
 Product identification: Ultrium 5-SCSI
 Product revision level: N11G
 Unit serial number: 8100216
 NAA: 250:11:22:33:ab:22:0:6
 Compression: factor 1 enabled 1
 Compression type: lzo
 Backoff: 400

Drive: 257 CHANNEL: 22 TARGET: 0 LUN: 7
 Library ID: 250 Slot: 7
 Vendor identification: HP
 Product identification: Ultrium 5-SCSI
 Product revision level: N11G
 Unit serial number: 8100217
 NAA: 250:11:22:33:ab:22:0:7
 Compression: factor 1 enabled 1


I can see /dev/mhvtl256 in the /dev  
crw-r-----. 1 vtl  vtl     248,  250 12月 17 13:31 mhvtl250
crw-r-----. 1 vtl  vtl     248,  251 12月 17 13:31 mhvtl251
crw-r-----. 1 vtl  vtl     248,  252 12月 17 13:31 mhvtl252
crw-r-----. 1 vtl  vtl     248,  253 12月 17 13:31 mhvtl253
crw-r-----. 1 vtl  vtl     248,  254 12月 17 13:31 mhvtl254
crw-r-----. 1 vtl  vtl     248,  256 12月 17 13:31 mhvtl256
crw-r-----. 1 vtl  vtl     248,  257 12月 17 13:31 mhvtl257
crw-r-----. 1 vtl  vtl     248,  258 12月 17 13:31 mhvtl258
crw-r-----. 1 vtl  vtl     248,  260 12月 17 13:31 mhvtl260
crw-r-----. 1 vtl  vtl     248,  261 12月 17 13:31 mhvtl261