Benny is right, if writes are smaller than the stripe size, there is no gain in speed in using raid5. Not only, but you can have lower performance than a single disk.<div><br></div><div>The ramdisk can be a good idea, but if the load is somewhat constant, you end only moving the slow write ahead of time. 200 calls at 64kbit/s are just 1.5 Mbyte/s ... even the slowest disk can accomplish this.</div>
<div><br></div><div>Leandro<br><br><div class="gmail_quote">2012/8/4 Shahid H <span dir="ltr"><<a href="mailto:shahidh@gmail.com" target="_blank">shahidh@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Instead of buying expensive disk.. I might setup a ramdisk (about 2GB) to do 200 calls recordings.<div><br></div><div>Once the call hangup/completed it will then move recording file to SATA HDD.</div><div><br></div><div>What do you think of this?</div>
<div class="HOEnZb"><div class="h5">
<div><br></div><div><br><div class="gmail_quote">On Sat, Aug 4, 2012 at 5:51 PM, Benny Amorsen <span dir="ltr"><<a href="mailto:benny+usenet@amorsen.dk" target="_blank">benny+usenet@amorsen.dk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Leandro Dardini <<a href="mailto:ldardini@gmail.com" target="_blank">ldardini@gmail.com</a>> writes:<br>
<br>
> A single sata disk will be an unacceptable single point of failure. Get<br>
> three disks and get in raid5 configuration. You'll gain in safety and<br>
> speed.<br>
<br>
</div>RAID-5 is slower than single disks when it comes to write IOPS (a commit<br>
is not done until the slowest disk has answered). Avoid it for write<br>
heavy workloads at all costs unless you are writing sequentially in one<br>
file with write caching enabled.<br>
<span><font color="#888888"><br>
<br>
/Benny<br>
</font></span><div><div><br>
<br>
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