[nmglug] Raid Help

[Jason Davis]

On Wed, 2005-05-25 at 17:37 -0600, Ed Brown wrote:
> Tim,
> 
> I'm confused about your setup.  /dev/md0 is usually associated with
> software RAID, yet you mention having a SiL raid card, which I'm
> guessing is a hardware RAID controller.  How did you set up your RAID?
> 
> -Ed
> 
that threw me a bit too

jd


> 
> On Wed, 2005-05-25 at 16:21, Tim Emerick wrote:
> > I need some help with my Debian/samba server with regards to raid
> > performance.
> > 
> > I get pretty fast reads but extremely slow writes.  A folder with 116MB took
> > 38 seconds to read from the server but 5 minutes 18 seconds to write to the
> > server.  I've heard that fast reads and normal writes is fairly typical with
> > a simple mirror raid but the slowness of my writes are ridiculous.  
> > 
> > I think I probably have something mis-configured.  I would like to have a
> > conversation with someone that can help me figure out either what is wrong or
> > what I can do to get better performance. Please feel free to contact me in
> > person or chat for a more "Live" discussion. I would greatly welcome any
> > help.
> > 
> > Tim Emerick
> > Reliable Chevrolet
> > 505-338-5848
> > aim: timemerick
> > yahoo: timothyemerick
> > timothyemerick at yahoo.com
> > 
> > Here are some stats:
> > 
> > Machine is a P4-1.5ghz with 2 80gb HD's sitting on a SiL raid card using
> > raid1/mirror (/dev/hde1 & /dev/hdg1 raided as /dev/md0) and a 160GB drive
> > (/dev/hda6) for rolling backups.
> > 
> > Roughly 100 casual users and 5 heavy database users.  
> > 
> > Currently Swat reports about 30 active connections, 30 active shares, and 450
> > open files.
> > 
> > # cat /proc/meminfo
> > MemTotal:       256944 kB
> > MemFree:          5276 kB
> > Buffers:         13660 kB
> > Cached:         175668 kB
> > SwapCached:          0 kB
> > Active:          47600 kB
> > Inactive:       162768 kB
> > HighTotal:           0 kB
> > HighFree:            0 kB
> > LowTotal:       256944 kB
> > LowFree:          5276 kB
> > SwapTotal:      746980 kB
> > SwapFree:       746980 kB
> > Dirty:             256 kB
> > Writeback:           0 kB
> > Mapped:          28628 kB
> > Slab:            37180 kB
> > Committed_AS:    67328 kB
> > PageTables:        724 kB
> > VmallocTotal:   778160 kB
> > VmallocUsed:      2616 kB
> > VmallocChunk:   775044 kB
> > 
> > # df -h
> > Filesystem            Size  Used Avail Use% Mounted on
> > /dev/hda1             6.5G  576M  5.6G  10% /
> > tmpfs                 126M     0  126M   0% /dev/shm
> > /dev/hda6             140G  109G   24G  83% /backup
> > /dev/md0               74G   29G   42G  41% /shares
> > 
> > # cat /proc/loadavg
> > 0.00 0.00 0.00 3/66 14525
> > 
> > 
> > 
> > 
> > 		
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