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From: | Anthony Liguori |
Subject: | Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? |
Date: | Wed, 04 Aug 2010 12:53:23 -0500 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.11) Gecko/20100713 Lightning/1.0b1 Thunderbird/3.0.6 |
On 08/04/2010 12:37 PM, Avi Kivity wrote:
On 08/04/2010 08:27 PM, Anthony Liguori wrote:On 08/04/2010 12:19 PM, Avi Kivity wrote:On 08/04/2010 08:01 PM, Paolo Bonzini wrote:That's another story and I totally agree here, but not reusing /dev/sd* is not intrinsic in the design of virtio-blk (and one thing that Windows gets right; everything is SCSI, period).I don't really get why everything must be SCSI. Everything must support read, write, a few other commands, and a large set of optional commands. But why map them all to SCSI? What's the magic?Because that's what real hardware with only a few rare exceptions.I thought that IDE was emulated as SCSI even when it wasn't. But I guess now with SATA you're right.
IDE -> EIDE -> ATA -> SATAATA can encapsulate SCSI commands via ATAPI which gives you the ability to have ATA based CD-ROMs among other things.
I don't believe that SATA actually uses SCSI commands for read/write operations but I think Linux exposes SATA drivers as SCSI anyway.
Regards, Anthony Liguori
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