From: Christian Tschabuschnig <tschaboo@gmx.at>
To: dm-crypt@saout.de
Subject: [dm-crypt] How will ATA-TRIM be handled?
Date: Sun, 04 Oct 2009 01:23:24 +0200 [thread overview]
Message-ID: <4AC7DCEC.1000700@gmx.at> (raw)
Hello,
I don't know much about the internals of filesystems or devicemapper but
I know that the kernel supports ATA-TRIM and that ext4 supports or will
soon support it.
My question is: What happens, if a dm-crypt-layer is between the
filesystem and the real block-device? Will the trim be passed through,
or will it be discarded?
Optimally, i think, both should be possible. Passing through the
information will improve performance and lifetime of a SSD and
discarding it would give less information to an attacker since the SSD
will return zeroes on LBAs that are not mapped.
Regards,
Christian
next reply other threads:[~2009-10-03 23:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-03 23:23 Christian Tschabuschnig [this message]
2009-10-04 6:32 ` [dm-crypt] How will ATA-TRIM be handled? Heinz Diehl
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