xen支持的塊設備

1. 物理塊設備（Dom0中的物理塊設備，如邏輯卷）
? ? phy:/dev/cdrom
? ? phy:/dev/xenvg/vm1
2. 磁盤鏡像
? ? file:/root/tst.iso（使用loopback）
? ? nbd: ip_port （網絡塊設備）
? ? tap:cdrom:/dev/sr0（CD設備）
? ? tap:aio:/path/file ?（blktap）
? ? tap:qcow:/mnt/disks/sles10sp1.iso.qcow（QEMU磁盤鏡像）
? ? tap:vmdk:/mnt/disks/sles10sp1.iso.vmdk（Vmware磁盤鏡像）
3. ISCSI設備：
? ? iscsi:iqn.2001-04.com.acme@0ac47ee2-216e-452a-a341-a12624cd0225
4. NPIV設備：
? ? npiv:210400e08b80c40f

file與tap的區別

file: uses dom0 kernel page cache, and thus might give better performance than phy: or tap:aio:,
but it's also more insecure because of the caching.

tap:aio: uses direct IO, so it bypasses dom0 kernel caches, and works like phy: in that sense.

blktap1 provides also other modes than :aio, like: qcow, but those were not very stable or fast,
? ? disk = ['tap:aio:<FILENAME>,sda1,w']
? ? disk = ['tap:qcow:<FILENAME>,sda1,w']
so blktap2 was developed. for blktap1 see: http://wiki.xensource.com/xenwiki/blktap .

blktap2 also has vhd image support including snapshots and cloning.
? ? disk = [ "tap:tapdisk:vhd:/path/images/disk.vhd,xvda,w" ]
? ? disk = [ "tap2:tapdisk:vhd:/path/images/disk.vhd,xvda,w" ]
See here: http://wiki.xensource.com/xenwiki/blktap2 .

本文轉自feisky博客園博客，原文鏈接：http://www.cnblogs.com/feisky/archive/2012/01/31/2332809.html，如需轉載請自行聯系原作者

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