From: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> |
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To: | Luke Lonergan <LLonergan(at)greenplum(dot)com> |
Cc: | dlang(at)invendra(dot)net, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Hardware/OS recommendations for large databases ( |
Date: | 2005-11-27 15:48:01 |
Message-ID: | 20051127072933.Q62040@megazone.bigpanda.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
On Sun, 27 Nov 2005, Luke Lonergan wrote:
> Has anyone done the math.on the original post? 5TB takes how long to
> scan once? If you want to wait less than a couple of days just for a
> seq scan, you'd better be in the multi-gb per second range.
Err, I get about 31 megabytes/second to do 5TB in 170,000 seconds. I think
perhaps you were exaggerating a bit or adding additional overhead not
obvious from the above. ;)
---
At 1 gigabyte per second, 1 terrabyte should take about 1000 seconds
(between 16 and 17 minutes). The impressive 3.2 gigabytes per second
listed before (if it actually scans consistently at that rate), puts it at
a little over 5 minutes I believe for 1, so about 26 for 5 terrabytes.
The 200 megabyte per second number puts it about 7 hours for 5
terrabytes AFAICS.
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