Re: Intel SRCS16 SATA raid?
От | Richard_D_Levine@raytheon.com |
---|---|
Тема | Re: Intel SRCS16 SATA raid? |
Дата | |
Msg-id | OFBEE625DB.546B0E65-ON05256FE4.004E8603-05256FE4.004ED4D7@ftw.us.ray.com обсуждение исходный текст |
Ответ на | Re: Intel SRCS16 SATA raid? ("Dave Held" <dave.held@arrayservicesgrp.com>) |
Список | pgsql-performance |
Dave wrote "An interesting test would be to stick several drives in a cabinet and graph how performance is affected at the different price points/ technologies/number of drives." From the discussion on the $7k server thread, it seems the RAID controller would be an important data point also. And RAID level. And application load/kind. Hmmm. I just talked myself out of it. Seems like I'd end up with something akin to those database benchmarks we all love to hate. Rick pgsql-performance-owner@postgresql.org wrote on 04/15/2005 08:40:13 AM: > > -----Original Message----- > > From: Alex Turner [mailto:armtuk@gmail.com] > > Sent: Thursday, April 14, 2005 6:15 PM > > To: Dave Held > > Cc: pgsql-performance@postgresql.org > > Subject: Re: [PERFORM] Intel SRCS16 SATA raid? > > > > Looking at the numbers, the raptor with TCQ enabled was close or > > beat the Atlas III 10k drive on most benchmarks. > > And I would be willing to bet that the Atlas 10k is not using the > same generation of technology as the Raptors. > > > Naturaly a 15k drive is going to be faster in many areas, but it > > is also much more expensive. It was only 44% better on the server > > tests than the raptor with TCQ, but it costs nearly 300% more ($538 > > cdw.com, $180 newegg.com). > > State that in terms of cars. Would you be willing to pay 300% more > for a car that is 44% faster than your competitor's? Of course you > would, because we all recognize that the cost of speed/performance > does not scale linearly. Naturally, you buy the best speed that you > can afford, but when it comes to hard drives, the only major feature > whose price tends to scale anywhere close to linearly is capacity. > > > Note also that the 15k drive was the only drive that kept up with > > the raptor on raw transfer speed, which is going to matter for WAL. > > So get a Raptor for your WAL partition. ;) > > > [...] > > The Raptor drives can be had for as little as $180/ea, which is > > quite a good price point considering they can keep up with their > > SCSI 10k RPM counterparts on almost all tests with NCQ enabled > > (Note that 3ware controllers _don't_ support NCQ, although they > > claim their HBA based queueing is 95% as good as NCQ on the drive). > > Just keep in mind the points made by the Seagate article. You're > buying much more than just performance for that $500+. You're also > buying vibrational tolerance, high MTBF, better internal > environmental controls, and a pretty significant margin on seek time, > which is probably your most important feature for disks storing tables. > An interesting test would be to stick several drives in a cabinet and > graph how performance is affected at the different price points/ > technologies/number of drives. > > __ > David B. Held > Software Engineer/Array Services Group > 200 14th Ave. East, Sartell, MN 56377 > 320.534.3637 320.253.7800 800.752.8129 > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to majordomo@postgresql.org so that your > message can get through to the mailing list cleanly
В списке pgsql-performance по дате отправления: