Displaying 3 results from an estimated 3 matches for "book_kvm".
2014 Aug 11
2
Behavior of disk caching with qcow2 disks
...efault:
http://www-01.ibm.com/support/knowledgecenter/linuxonibm/liaat/liaatbpkvmguestcache.htm?lang=en
However this SuSE documentation claims that QEMU 1.2.x and newer allows the
driver to select which cache mode, and it often defaults to cache=writeback:
https://www.suse.com/documentation/sles11/book_kvm/data/sect1_1_chapter_book_kvm.html
Which is correct? How is the cache mode set by default (if cache= is not
specified)?
My second question is can cache=none be used safely on a local ext4 filesystem
with no BBU? Since ext4 uses barriers, would writing to these qcow2 image files
be safe? The kerne...
2014 Aug 12
0
Re: Behavior of disk caching with qcow2 disks
...m/liaat/liaatbpkvmguestcache.htm?lang=en
The above sounds incorrect (refer below).
> However this SuSE documentation claims that QEMU 1.2.x and newer
> allows the driver to select which cache mode, and it often defaults to
> cache=writeback:
> https://www.suse.com/documentation/sles11/book_kvm/data/sect1_1_chapter_book_kvm.html
The above seems correct.
Looking at `qemu-img` source[1], 'cache=writeback' seems to be the
default. That's also corroborated by this[2] (Rich's blog, and
libguestfs/virt-tools lead developer).
[1] http://git.qemu.org/?p=qemu.git;a=blob;f=qem...
2015 Jan 16
2
kvm guest from zfs dataset
Hi all,
I thought I?d post this in case any one has issues similar to mine.
First, my initial email to the list which I didn?t send;
I?m trying to run a KVM based guest OS off of a mirrored ZFS dataset.
It won?t run with errors "invalid argument..", but will run when on the root volume, or when that ZFS dataset has been removed in favor of an EXT4 volumes.
Thanks in advance,
PS I