/dev/sdp is an EBS volume.  /dev/sdb is a native volume.

This is a large instance.

r...@domu-<mumble>#:~# hdparm -tT /dev/sdp

 Timing cached reads:   1634 MB in  2.00 seconds = 817.30 MB/sec
 Timing buffered disk reads:  160 MB in  3.00 seconds =  53.27 MB/sec
r...@domu-<mumble>:~# hdparm -tT /dev/sdb

 Timing cached reads:   1658 MB in  2.00 seconds = 829.44 MB/sec
 Timing buffered disk reads:  242 MB in  3.00 seconds =  80.56 MB/sec
r...@domu-<mumble>:~# time dd if=/dev/urandom bs=512000 of=/tmp/memtest
1050+0 records in
1050+0 records out
537600000 bytes (538 MB) copied, 106.525 s, 5.0 MB/s

real    1m46.517s
user    0m0.000s
sys    1m46.127s
r...@domu-<mumble>:~# time md5sum /tmp/memtest; time md5sum /tmp/memtest;
time md5sum /tmp/memtest
f79304f68ce04011ca0aebfbd548134a  /tmp/memtest

real    0m2.234s
user    0m1.613s
sys    0m0.590s
f79304f68ce04011ca0aebfbd548134a  /tmp/memtest

real    0m2.136s
user    0m1.560s
sys    0m0.584s
f79304f68ce04011ca0aebfbd548134a  /tmp/memtest

real    0m2.123s
user    0m1.640s
sys    0m0.481s

On Mon, Nov 9, 2009 at 4:54 PM, Patrick Hunt <ph...@apache.org> wrote:

> I'm really interested to know how ec2 compares wrt disk and network
> performance to what I've documented here under the "hardware" section:
> http://wiki.apache.org/hadoop/ZooKeeper/ServiceLatencyOverview#Hardware
> Is it possible for someone to compare the network and disk performance
> (scp, dd, md5sum, etc...) that I document in the wiki page on say, EC2
> small/large nodes? I'd do it myself but I've not used ec2. If anyone could
> try these and report I'd appreciate it.
> Patrick
> Ted Dunning wrote:
>> Worked pretty well for me.  We did extend all of our timeouts.  The
>> biggest
>> worry for us was timeouts on the client side.  The ZK server side was no
>> problem in that respect.
>> On Mon, Nov 9, 2009 at 4:20 PM, Jun Rao <jun...@almaden.ibm.com> wrote:
>>  Has anyone deployed ZK on EC2? What's the experience there? Are there
>>> more
>>> timeouts, lead re-election, etc? Thanks,
>>> Jun
>>> IBM Almaden Research Center
>>> K55/B1, 650 Harry Road, San Jose, CA  95120-6099
>>> jun...@almaden.ibm.com

Ted Dunning, CTO

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