Trim on KVM Linode

Hello,

I've been doing some testing with a kvm linode and it appears that Trim is enabled. (Ubuntu 14.04.2 LTS - 4.0.5-x86_64-linode58)

I'm wondering given the issues with ssd firmware lately (Algolia blog) with queued trim (and possibly non-queued trim) does linode officially support the use of trim? Does Linode use ssds with firmware that isn't known to have issues with trim? (Linux queued trim blacklist)

sudo fstrim -v /
/: 265691136 bytes were trimmed

cat /sys/block/sda/queue/discard_granularity
4096

discard_granularity (RO)

–---------------------

This shows the size of internal allocation of the device in bytes, if

reported by the device. A value of '0' means device does not support

the discard functionality.

cat /sys/block/sda/queue/discard_max_bytes
1073741824

discardmaxbytes (RO)

–--------------------

Devices that support discard functionality may have internal limits on

the number of bytes that can be trimmed or unmapped in a single operation.

The discardmaxbytes parameter is set by the device driver to the maximum

number of bytes that can be discarded in a single operation. Discard

requests issued to the device must not exceed this limit. A discardmaxbytes

value of 0 means that the device does not support discard functionality.

cat /sys/block/sda/queue/discard_zeroes_data
0

discardzeroesdata (RO)

–----------------------

When read, this file will show if the discarded block are zeroed by the

device or not. If its value is '1' the blocks are zeroed otherwise not.

(/sys/block qutoes from here)