[nmglug] Raid Help

[Ed Brown]

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


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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