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centos 新增硬盤以后，系統不能自動進行識別。
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1. 由于不知道新增硬盤掛載的位置，可以先查看現有硬盤掛載的適配器。
[root@localhost ~]# ls -l /sys/block/sda lrwxrwxrwx. 1 root root 0 Jun 15 11:47 /sys/block/sda -> ../devices/pci0000:00/0000:00:10.0/host32/target32:0:0/32:0:0:0/block/sda
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2. 發現正在磁盤掛載到host32，可以嘗試使用下邊命令，重新掃描host32信息
echo "- - -" > /sys/class/scsi_host/host32/scan
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3. 執行完成后，dmesg可以查看到新增硬盤信息。
[ 620.865767] scsi 32:0:1:0: Direct-Access VMware, VMware Virtual S 1.0 PQ: 0 ANSI: 2[ 620.865800] scsi target32:0:1: Beginning Domain Validation [ 620.866413] scsi target32:0:1: Domain Validation skipping write tests [ 620.866416] scsi target32:0:1: Ending Domain Validation [ 620.866450] scsi target32:0:1: FAST-40 WIDE SCSI 80.0 MB/s ST (25 ns, offset 127) [ 620.870284] sd 32:0:1:0: Attached scsi generic sg2 type 0[ 620.870360] sd 32:0:1:0: [sdb] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB) [ 620.870408] sd 32:0:1:0: [sdb] Write Protect is off [ 620.870410] sd 32:0:1:0: [sdb] Mode Sense: 61 00 00 00[ 620.870734] sd 32:0:1:0: [sdb] Cache data unavailable [ 620.870736] sd 32:0:1:0: [sdb] Assuming drive cache: write through [ 620.874775] sd 32:0:1:0: [sdb] Cache data unavailable [ 620.874779] sd 32:0:1:0: [sdb] Assuming drive cache: write through [ 620.875859] sdb: unknown partition table [ 620.876069] sd 32:0:1:0: [sdb] Cache data unavailable [ 620.876071] sd 32:0:1:0: [sdb] Assuming drive cache: write through [ 620.876123] sd 32:0:1:0: [sdb] Attached SCSI disk
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4. fdisk -l 可以發現心中的/dev/sdb信息
Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
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5. 現在就可以使用fdisk -l 或者parted命令進行分區操作了。
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?從總線刪除/dev/sdb硬盤（刪除后，不能識別/dev/sdb硬盤了）
echo 1 > /sys/block/sdb/device/delete
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