From: "Matthew Simpson" <matthew@symatec-computer.com>
To: linux-raid@vger.kernel.org
Subject: how to turn down cpu usage of raid ?
Date: Mon, 2 Feb 2004 17:18:19 -0600 [thread overview]
Message-ID: <021c01c3e9e2$d80b3640$0100a8c0@KARI> (raw)
Help! I am having complaints from users about CPU spikes when writing to my
RAID 1 array. Is there a way I can tune software RAID so that writing
updates doesn't interfere with other applications? [can I nice the raid1d
process?]
Specifically I experience giant slowdowns in a hosted application whenever
someone unpacks a tar file or the like. Load averages are 1.10 - 2.00
during writes, but 0.00 to 0.05 otherwise.
root@ns2:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid1 hdc1[1] hda1[0]
78979200 blocks [2/2] [UU]
unused devices: <none>
root@ns2:~# cat /etc/raidtab
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
chunk-size 4
persistent-superblock 1
device /dev/hda1
raid-disk 0
device /dev/hdc1
raid-disk 1
This is a pentium IV 2.5GHz system with 1GB of RAM.
IDE interface: PCI device 8086:24cb (Intel Corp.) (rev 1). -- 82820
Camino 2 chipset
next reply other threads:[~2004-02-02 23:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-02 23:18 Matthew Simpson [this message]
2004-02-03 1:37 ` how to turn down cpu usage of raid ? Mark Hahn
2004-02-03 2:25 ` Matthew Simpson
2004-02-03 1:39 ` Guy
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='021c01c3e9e2$d80b3640$0100a8c0@KARI' \
--to=matthew@symatec-computer.com \
--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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox