From owner-freebsd-geom@FreeBSD.ORG  Thu Aug  4 10:17:11 2011
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Date: Thu, 4 Aug 2011 13:00:14 +0300
From: Dmitry Zamaruyev <dmitry.zamaruyev@zoral.com.ua>
To: freebsd-geom@freebsd.org
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Subject: SSD and gmirror
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Hello list,

I'm looking for clarification regarding gmirror/geom behavior in
current 8-STABLE.
I want to use couple of SSD drives in mirror RAID configuration with
UFS on top. I know that UFS now supports TRIM (BIO_DELETE) on plain
disks.
But will gmirror propagate BIO_DELETE event to lower driver, so both
SSDs will get trimmed when UFS issue this command?

-- 
Best regards,
Dmitry Zamaruev