All of lore.kernel.org
 help / color / mirror / Atom feed
From: Michael Heide <lkml662@der-he.de>
To: linux-raid@vger.kernel.org
Subject: write-mostly vs. write-behind
Date: Thu, 18 Jul 2013 09:25:10 +0200	[thread overview]
Message-ID: <20130718092510.6f4a6fd6@tbb-phenom> (raw)

Hi,

the md manpage says there are write-mostly and write-behind options for 
md raid1 and you can use write-behind on devices where write-mostly
is activated. 

I'm using a small low-power home-server with a HDD and an usb flash drive, 
where one HDD partition (with important data) is mirrored (raid1) to 
the flash drive. (other data is not that important)

The flash drive (usb-stick / pen-drive / usb-key) is faster in reads and 
slower in writes than the HDD. So read requests are slow because of the
slower HDD and write requests are even slower because of the slow flash
drive.

I would like to use "write-mostly" with the HDD and "write-behind" with
the flash drive. That's impossible with Linux MD Raids, right?

Regards
Michael

(I'm not subscribed)

                 reply	other threads:[~2013-07-18  7:25 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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=20130718092510.6f4a6fd6@tbb-phenom \
    --to=lkml662@der-he.de \
    --cc=linux-raid@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.