cdelorme at gmail
Jul 8, 2012, 8:42 PM
Post #2 of 4
I have been using a SSD with Xen 4.2 for 6 months. I am running on Debian
Wheezy Dom0, and a compiled Kernel 3.4.4.
Trim required not only the appropriate kernel, but the discard flag in
fstab, and only for compatible file systems (Ext4 being one).
My SSD has /boot/efi and /boot partitions, the rest is LVM, and I have Ext4
for my /home and / (root) partitions with discard flag added manually to
/etc/fstab. This appears to be working.
For virtual machines I have an HVM Windows which without GPLPV drivers
appears to have recognized that it was running on a SSD (well a LV on an
SSD), as it had Auto Disk Defrag turned off. So HVM Windows appears to
I have been running a Debian Squeeze HVM DomU for web development testing,
and for stability I had not added trim. I also have been running a pfSense
HVM DomU (FreeBSD) but I have not checked whether it supports trim either.
On Sun, Jul 8, 2012 at 11:25 PM, Liwei <xieliwei [at] gmail> wrote:
> Hi list,
> Recently we've been thinking of adding SSDs into some of our domU
> VMs to boost application loading times. Looking around, it seems that
> information about trim support in various configurations is sparse at
> The only clear confirmation I could find is that trim is supported
> in PV domU on Linux kernels 3.1 and above, but only if dom0 has kernel
> 3.1 and above as well.
> So paravirtualised Linux domUs are fine for the upgrade, but what
> about other configurations?
> 1. Non-PV Linux domUs?
> 2. Non-PV BSD domUs?
> 3. PV BSD domUs?
> 4. Windows domUs?
> 5. Windows domUs with PV drivers?
> 6. Other non-PV configurations?
> Perhaps it'd be great to clear everything up now.
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