From: "JaniD++" <djani22@dynamicweb.hu>
To: linux-raid@vger.kernel.org
Subject: RAID0 performance question
Date: Sat, 26 Nov 2005 15:04:37 +0100 [thread overview]
Message-ID: <015c01c5f292$57e0e270$0400a8c0@dcccs> (raw)
In-Reply-To: 20051122220531.GU26862@skl-net.de
Hello list,
I have searching the bottleneck of my system, and found something what i
cant cleanly understand.
I have use NBD with 4 disk nodes. (raidtab is the bottom of mail)
The cat /dev/nb# >/dev/null makes ~ 350 Mbit/s on each nodes.
The cat /dev/nb0 + nb1 + nb2 + nb3 in one time parallel makes ~ 780-800
Mbit/s. - i think this is my network bottleneck.
But the cat /dev/md31 >/dev/null (RAID0, the sum of 4 nodes) only makes
~450-490 Mbit/s, and i dont know why....
Somebody have an idea? :-)
(the nb31,30,29,28 only possible mirrors)
Thanks
Janos
raiddev /dev/md1
raid-level 1
nr-raid-disks 2
chunk-size 32
persistent-superblock 1
device /dev/nb0
raid-disk 0
device /dev/nb31
raid-disk 1
failed-disk /dev/nb31
raiddev /dev/md2
raid-level 1
nr-raid-disks 2
chunk-size 32
persistent-superblock 1
device /dev/nb1
raid-disk 0
device /dev/hb30
raid-disk 1
failed-disk /dev/nb30
raiddev /dev/md3
raid-level 1
nr-raid-disks 2
chunk-size 32
persistent-superblock 1
device /dev/nb2
raid-disk 0
device /dev/nb29
raid-disk 1
failed-disk /dev/nb29
raiddev /dev/md4
raid-level 1
nr-raid-disks 2
chunk-size 32
persistent-superblock 1
device /dev/nb3
raid-disk 0
device /dev/nb28
raid-disk 1
failed-disk /dev/nb28
raiddev /dev/md31
raid-level 0
nr-raid-disks 4
chunk-size 32
persistent-superblock 1
device /dev/md1
raid-disk 0
device /dev/md2
raid-disk 1
device /dev/md3
raid-disk 2
device /dev/md4
raid-disk 3
next prev parent reply other threads:[~2005-11-26 14:04 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-18 19:34 mdadm 2.1: command line option parsing bug? Andreas Haumer
2005-11-21 23:21 ` Neil Brown
2005-11-22 11:21 ` Michael Tokarev
2005-11-24 5:15 ` Neil Brown
2005-11-22 15:41 ` Molle Bestefich
2005-11-24 5:25 ` Neil Brown
2005-11-24 7:31 ` Ross Vandegrift
2005-12-15 1:53 ` Molle Bestefich
2005-12-15 4:19 ` Neil Brown
2005-12-15 10:37 ` Molle Bestefich
2005-11-22 22:05 ` Andre Noll
2005-11-26 14:04 ` JaniD++ [this message]
2005-11-26 15:56 ` RAID0 performance question Raz Ben-Jehuda(caro)
2005-11-26 16:08 ` JaniD++
2005-11-26 17:11 ` Lajber Zoltan
2005-11-26 17:34 ` JaniD++
2005-11-26 19:47 ` Lajber Zoltan
2005-11-26 23:27 ` Neil Brown
2005-11-26 23:37 ` JaniD++
2005-11-27 15:39 ` Al Boldi
2005-11-27 16:21 ` JaniD++
2005-11-27 17:40 ` Al Boldi
2005-11-27 19:02 ` JaniD++
2005-11-30 23:13 ` JaniD++
2005-12-02 19:53 ` Al Boldi
2005-12-18 0:13 ` JaniD++
2005-12-19 11:16 ` Al Boldi
2005-11-22 1:14 ` JaniD++
2005-11-23 10:48 ` JaniD++
2005-12-21 1:40 ` Neil Brown
2005-11-22 1:56 ` JaniD++
2005-12-22 4:49 ` Neil Brown
2005-11-23 9:44 ` JaniD++
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