All of lore.kernel.org
 help / color / mirror / Atom feed
From: Martin <m_btrfs@ml1.co.uk>
To: linux-btrfs@vger.kernel.org
Subject: SSD erase state and reducing SSD wear
Date: Tue, 22 May 2012 22:47:42 +0100	[thread overview]
Message-ID: <jph1hu$2tq$1@dough.gmane.org> (raw)

I've got two recent examples of SSDs. Their pristine state from the
manufacturer shows:


Device Model:     OCZ-VERTEX3

# hexdump -C /dev/sdd
00000000  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|................|
*
1bf2976000


Device Model:     OCZ VERTEX PLUS
(OCZ VERTEX 2E)

# hexdump -C /dev/sdd
00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
|................|
*
df99e6000



What's a good way to test what state they get erased to from a TRIM
operation?

Can btrfs detect the erase state and pad unused space in filesystem
writes with the same value so as to reduce SSD wear?

Regards,
Martin


             reply	other threads:[~2012-05-22 21:47 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-22 21:47 Martin [this message]
2012-05-23  4:19 ` SSD erase state and reducing SSD wear Calvin Walton
2012-05-23 15:44   ` Martin
2012-05-23 19:50     ` Calvin Walton

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='jph1hu$2tq$1@dough.gmane.org' \
    --to=m_btrfs@ml1.co.uk \
    --cc=linux-btrfs@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.