Few questions about TRIM/discard

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Hello,

Setting up a new array and have a couple of questions, maybe someone can
clarify. Thanks in advance.

- Does md in the 3.4.8 kernel support passing discard to SSDs in RAID1?

- Will it still work if a RAID1 has not only SSD members, but also an HDD?

- How to verify that TRIM works properly (i.e. actually being issued)?

- Is TRIM usage generally recommended and not known to cause problems on an
older generation SandForce controller (in a Corsair F60-A)? And on a newer
SandForce (Adata S511)?

Feel free to ignore some (or all) of these questions. :)

-- 
With respect,
Roman

~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Stallman had a printer,
with code he could not see.
So he began to tinker,
and set the software free."

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