Is TRIM passed through a LVM-based PV Xen domU to the underlying SSD

Question

Scenario: -- Debian Xen dom0 -- SSD drive setup as LVM PV/single Volume Group. -- Debian pv_ops-based domU setup on LVM logical volume. -- File system inside domU is ext4 with discard option enabled.

Question: Will the TRIM command generated inside the domU pass through these layers and reach the physical SSD?

score 0 · Accepted Answer · answered Jul 04 '12 at 02:15

0

Linux supports TRIM both as a domU (through commit ed30bf317) and dom0 (through commit b3cb0d6), but only starting with the version 3.1.

Support in DeviceMapper (the kernel technology underlying LVM) is older, so it won't be the problem.

answered Jul 04 '12 at 02:15

Pierre Carrier

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version 3.1 of what? Linux kernel? – Brian Blood Jul 04 '12 at 03:45
Yes. Sorry if that was ambiguous. – Pierre Carrier Jul 04 '12 at 04:08

Is TRIM passed through a LVM-based PV Xen domU to the underlying SSD

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