From: Phillip Susi <phill@thesusis.net>
To: Piergiorgio Sartor <piergiorgio.sartor@nexgo.de>,
Reindl Harald <h.reindl@thelounge.net>
Cc: Piergiorgio Sartor <piergiorgio.sartor@nexgo.de>,
linux-raid@vger.kernel.org
Subject: Re: RAID-10 near vs. RAID-1
Date: Tue, 25 Jun 2024 15:00:39 -0400 [thread overview]
Message-ID: <87ikxw6e5k.fsf@vps.thesusis.net> (raw)
In-Reply-To: <ZmnZYgerX5g8S9Cp@lazy.lzy>
Piergiorgio Sartor <piergiorgio.sartor@nexgo.de> writes:
> As far as I know, but please correct me if
> I'm wrong, a Linux md RAID-10 *near* layout,
> with 2 devices, has identical data distribution
> as a RAID-1 with 2 devices.
> Meaning the 2 devices are a mirror.
That's correct.
> The difference, if I understood it correctly,
> is that the RAID-10 has chunks, and hence stripes,
> while the RAID-1 does not have stripes.
> Furthermore, the read operation on RAID-10 are
> interleaved, delivering (for SSDs) double
> sequential read speed (for 2 devices), while
> the RAID-1 can handle two independent (one per
> device) read stream, each with single device
> reading speed.
No, since the layout is exactly the same as raid1, large sequential
reads can not be sent to both drives at the same time.
Now a two disk raid-10 in the offset or far layout however, does
interleave the data across the drives so they can both be read at the
same time to increase throughput.
prev parent reply other threads:[~2024-06-25 19:00 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-11 18:31 RAID-10 near vs. RAID-1 Piergiorgio Sartor
2024-06-11 23:04 ` Reindl Harald
2024-06-12 0:14 ` Paul E Luse
2024-06-12 7:06 ` Reindl Harald
2024-06-12 7:18 ` Reindl Harald
2024-06-12 17:25 ` Piergiorgio Sartor
2024-06-12 17:22 ` Piergiorgio Sartor
2024-06-12 22:35 ` Reindl Harald
2024-06-12 23:46 ` Dragan Milivojević
2024-06-13 5:38 ` Reindl Harald
2024-06-13 7:30 ` Robin Hill
[not found] ` <CALtW_agtMXsss_Y=A2HH+D5zTceJ0jv5eWM5OeKiRZphvVeXZw@mail.gmail.com>
[not found] ` <599595a2-fa5e-45ca-b358-5fb573a8920e@thelounge.net>
2024-06-13 19:54 ` Dragan Milivojević
2024-06-13 20:18 ` Reindl Harald
[not found] ` <CALtW_ageds8cA-3CgbSNW5sFmRvWGmqoM0vA1vbi5LxWLhgt7g@mail.gmail.com>
2024-06-13 20:53 ` Reindl Harald
2024-06-25 19:00 ` Phillip Susi [this message]
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=87ikxw6e5k.fsf@vps.thesusis.net \
--to=phill@thesusis.net \
--cc=h.reindl@thelounge.net \
--cc=linux-raid@vger.kernel.org \
--cc=piergiorgio.sartor@nexgo.de \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox