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
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