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JM D.'s questions

Martin Hope
JM D.
Asked: 2022-05-19 18:01:10 +0800 CST
  • 5

我使用 libvirt + qemu 用带有 IDE 总线的磁盘启动虚拟机

libvirt 中的设备：

<disk type='network' device='disk'>
  <driver name='qemu' type='raw' cache='none' io='native'/>
  <source protocol='iscsi' name='xxx'>
    <host name='127.0.0.1' port='xxx'/>
  </source>
  <target dev='hdb' bus='ide'/>
  <boot order='3'/>
  <alias name='ide0-0-1'/>
  <address type='drive' controller='0' bus='0' target='0' unit='1'/>
</disk>

在qem中：

-drive file.driver=iscsi,file.portal=127.0.0.1:xxx,file.target=xxx,file.lun=xxx,file.transport=tcp,format=raw,if=none,id=drive-ide0-0-1,cache=none,aio=native
-device ide-hd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1,bootindex=3,write-cache=on

来宾操作系统是 CentOS-7.9-x86_64-DVD-2009

开机后，dmesg中的显示显示

May 18 06:07:37 localhost kernel: ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xd120 irq 14
May 18 06:07:37 localhost kernel: ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xd128 irq 15
May 18 09:15:54 localhost kernel: ata1.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
May 18 09:15:54 localhost kernel: ata1.01: ATA-7: QEMU HARDDISK, 2.5+, max UDMA/100
May 18 09:15:54 localhost kernel: ata1.01: 6291456 sectors, multi 16: LBA48
May 18 09:15:54 localhost kernel: ata1.00: configured for MWDMA2
May 18 09:15:54 localhost kernel: ata1.01: configured for MWDMA2
May 18 09:15:54 localhost kernel: scsi 0:0:0:0: CD-ROM            QEMU     QEMU DVD-ROM     2.5+ PQ: 0 ANSI: 5
May 18 09:15:54 localhost kernel: scsi 0:0:1:0: Direct-Access     ATA      QEMU HARDDISK    2.5+ PQ: 0 ANSI: 5
May 18 09:15:54 localhost kernel: sr 0:0:0:0: [sr0] scsi3-mmc drive: 4x/4x cd/rw xa/form2 tray
May 18 09:15:54 localhost kernel: cdrom: Uniform CD-ROM driver Revision: 3.20
May 18 09:15:54 localhost kernel: sd 0:0:1:0: [sda] 6291456 512-byte logical blocks: (3.22 GB/3.00 GiB)
May 18 09:15:54 localhost kernel: sd 0:0:1:0: [sda] Write Protect is off
May 18 09:15:54 localhost kernel: sd 0:0:1:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
May 18 09:15:54 localhost kernel: sd 0:0:1:0: [sda] Attached SCSI disk

并在 lshw 中显示

[root@localhost ~]# lshw -class disk
  *-cdrom                   
       description: DVD reader
       product: QEMU DVD-ROM
       vendor: QEMU
       physical id: 0.0.0
       bus info: scsi@0:0.0.0
       logical name: /dev/cdrom
       logical name: /dev/sr0
       version: 2.5+
       capabilities: removable audio dvd
       configuration: ansiversion=5 status=ready
     *-medium
          physical id: 0
          logical name: /dev/cdrom
          capabilities: partitioned partitioned:dos
          configuration: signature=6b8b4567
  *-disk
       description: ATA Disk
       product: QEMU HARDDISK
       physical id: 0.1.0
       bus info: scsi@0:0.1.0
       logical name: /dev/sda
       version: 2.5+
       serial: 918a6997-1928-38a1-9
       size: 3GiB (3221MB)
       configuration: ansiversion=5 logicalsectorsize=512 sectorsize=512

为什么 CentOS 将 ATA 总线转换为 scsi 总线？我在哪里可以看到更相关的描述？

centos qemu