From: Tim Moore <linux-raid@nsr500.net>
To: linux-raid@vger.kernel.org
Subject: Re: Software RAID-0 striping over Hardware RAID-5
Date: Wed, 22 Sep 2004 17:23:30 -0700 [thread overview]
Message-ID: <41521782.7030908@nsr500.net> (raw)
In-Reply-To: <200409201713.i8KHDxj01473@www.watkins-home.com>
>>From what I have read, RAID0 will just go as fast as your slowest disk.
Almost 2X faster.
[16:52] abit: > cat /proc/mdstat
Personalities : [raid0] [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid0 sdb5[1] sda5[0]
4192768 blocks 32k chunks
md1 : active raid0 sdb6[1] sda6[0]
2425600 blocks 32k chunks
md2 : active raid0 sdb7[1] sda7[0]
12707200 blocks 16k chunks
md3 : active raid0 sdb8[1] sda8[0]
20113152 blocks 64k chunks
unused devices: <none>
102400+0 records in
102400+0 records out
: 10.72 19% 0:10.72 s 2.12 u 0.02 mapf 112 mipf 12
: dd if=/dev/sda5 of=/dev/null bs=4k count=100k
102400+0 records in
102400+0 records out
: 11.33 19% 0:11.33 s 2.18 u 0.06 mapf 112 mipf 12
: dd if=/dev/sdb5 of=/dev/null bs=4k count=100k
102400+0 records in
102400+0 records out
: 5.81 32% 0:05.81 s 1.81 u 0.07 mapf 112 mipf 12
: dd if=/dev/md0 of=/dev/null bs=4k count=100k
[17:20] abit:~ > echo "scale=2;102400*4*1024;((10.72+11.33)/2)/5.81" | bc -q
419430400
1.89
next prev parent reply other threads:[~2004-09-23 0:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-20 13:51 Software RAID-0 striping over Hardware RAID-5 AndyLiebman
2004-09-20 17:13 ` Guy
2004-09-23 0:23 ` Tim Moore [this message]
2004-09-23 0:27 ` Scott T. Smith
2004-09-23 12:34 ` Doug Ledford
[not found] <1a1.29d2b13e.2e8039e4@aol.com>
2004-09-20 13:55 ` Joshua Baker-LePain
-- strict thread matches above, loose matches on Subject: below --
2004-09-17 22:03 AndyLiebman
2004-09-20 13:12 ` Joshua Baker-LePain
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=41521782.7030908@nsr500.net \
--to=linux-raid@nsr500.net \
--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.