ubuntu 停止某个硬盘让 lsblk 命令识别不到

Question

因为在测试程序需要拔硬盘和插上硬盘来回测试，导致总是去机房拔了又插，来回跑太多次了，有没有什么命令可以停止硬盘让lsblk命令检查不到某个硬盘

Answer 1

1、首先是要命令ll /sys/block查看磁盘编号，确认需要拔出的磁盘的编号，如 0 2 2 1
2、echo "scsi remove-single-device 2 0 0 1"> /proc/scsi/scsi模拟拔除硬盘
3、echo "scsi add-single-device 2 0 0 1"> /proc/scsi/scsi模拟插入硬盘

示例实验如下：
[root@s151 ~]# ll /sys/block
总用量 0
lrwxrwxrwx 1 root root 0 10月 26 15:06 dm-0 -> ../devices/virtual/block/dm-0
lrwxrwxrwx 1 root root 0 10月 26 15:06 dm-1 -> ../devices/virtual/block/dm-1
lrwxrwxrwx 1 root root 0 10月 26 15:06 dm-2 -> ../devices/virtual/block/dm-2
lrwxrwxrwx 1 root root 0 10月 26 15:06 sda -> ../devices/pci0000:00/0000:00:05.0/virtio1/host2/target2:0:0/2:0:0:0/block/sda
lrwxrwxrwx 1 root root 0 10月 26 15:06 sdb -> ../devices/pci0000:00/0000:00:05.0/virtio1/host2/target2:0:0/2:0:0:1/block/sdb
lrwxrwxrwx 1 root root 0 10月 26 15:06 sr0 -> ../devices/pci0000:00/0000:00:01.1/ata2/host1/target1:0:0/1:0:0:0/block/sr0
[root@s151 ~]# cat /proc/scsi/scsi
Attached devices:
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: QEMU Model: QEMU DVD-ROM Rev: 2.5+
Type: CD-ROM ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: QEMU Model: QEMU HARDDISK Rev: 2.5+
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 01
Vendor: QEMU Model: QEMU HARDDISK Rev: 2.5+
Type: Direct-Access ANSI SCSI revision: 05
[root@s151 ~]# echo "scsi remove-single-device 2 0 0 1"> /proc/scsi/scsi
[root@s151 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 60G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 59G 0 part
├─centos-root 253:0 0 38.3G 0 lvm /
├─centos-swap 253:1 0 2G 0 lvm [SWAP]
└─centos-home 253:2 0 18.7G 0 lvm /home
sr0 11:0 1 4.3G 0 rom
[root@s151 ~]# echo "scsi add-single-device 2 0 0 1"> /proc/scsi/scsi
[root@s151 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 60G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 59G 0 part
├─centos-root 253:0 0 38.3G 0 lvm /
├─centos-swap 253:1 0 2G 0 lvm [SWAP]
└─centos-home 253:2 0 18.7G 0 lvm /home
sdb 8:16 0 20G 0 disk
├─sdb1 8:17 0 10.5G 0 part
└─sdb2 8:18 0 9.5G 0 part
sr0 11:0 1 4.3G 0 rom