|Summary:||Win7 guests: cannot enable disk caching on IDE disks|
|Product:||Red Hat Enterprise Linux 5||Reporter:||Yaniv Kaul <ykaul>|
|Status:||CLOSED NOTABUG||QA Contact:||Virtualization Bugs <virt-bugs>|
|Version:||5.5.z||CC:||jkt, kwolf, virt-maint, ykaul|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2010-05-07 10:41:09 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
Description Yaniv Kaul 2010-04-22 10:49:10 UTC
Description of problem: Although the option exist (Device Manager -> Disk Drives -> 'QEMU HARDDISJ ATA' -> right click -> Properties -> Policies) to enable write caching, once you check it you get an error that it cannot be set. On XP/32, you can set this. Version-Release number of selected component (if applicable): kvm-83-164.el5_5.6 How reproducible: Always - both on Win7/32 and Win7/64. Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
Comment 1 firstname.lastname@example.org 2010-04-28 15:40:24 UTC
Note that you never could enabled/disable the write cache under qemu. While return success for the SETFEATURES calls, we never take any action. I suspect the difference is that Win7 issues an IDENTIFY call later to check if we actually advertize a cache now. Note that in recent qemu we will always advertize a write cache,
Comment 2 email@example.com 2010-05-07 10:41:09 UTC
Yaniv, is this serious in any way? Even implementing changing the caching settings is not a high priority, and backporting to RHEL5 certainly isn't. I'm tempted to close this as WONTFIX.
Comment 3 Yaniv Kaul 2010-05-07 18:51:41 UTC
I don't think it's serious, except for the user experience, where it appears he can do something, then gets a bit of an ugly error. If you don't want to fix it, close as WONTFIX. I guess there are more important bugs to fix.