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From: Konstantin Lepikhov <lakostis@mmti.ru>
To: community@altlinux.ru
Subject: [Comm] Re: скорость raid 5
Date: Mon, 29 Sep 2003 21:00:10 +0400
Message-ID: <20030929170010.GB4973@lks.home> (raw)
In-Reply-To: <447676348.20030929115343@kreschatic.kiev.ua>

Hi Alexey!

Monday 29, at 11:53:43 AM you wrote:

> Hello community,
> 
> Есть железяка, gateway 8200 с контролером aic7890 и ami megaraid. 4
> диска segate cheetah в raid 5. Как я понимаю непрерывный трансфер
> должен быть порядка 40-50Мb/s. Хотя hdparm дает следующее:
> #hdparm -tT /dev/sda
> 
> /dev/sda:
>  Timing buffer-cache reads:   492 MB in  2.00 seconds = 246.00 MB/sec
>  Timing buffered disk reads:   26 MB in  3.16 seconds =   8.23 MB/sec
> 
>  Помогите разобраться с этой проблемой, или наставте на путь истинный.
> P.S. Кусок dmesg в атаче.
irq conflict? Плохая терминация? Какой размер кеша на megaraid?

например, с MegaRAID Elite 1600 след. картина:

root@cedar ~# hdparm -tT /dev/sda

/dev/sda:
 Timing buffer-cache reads:   864 MB in  2.00 seconds = 432.00 MB/sec
 Timing buffered disk reads:  186 MB in  3.01 seconds =  61.79 MB/sec
root@cedar ~#

root@cedar ~# cat /proc/megaraid/0/config 
MegaRAID Elite 1600
Controller Type: 438/466/467/471/493
Controller Supports 40 Logical Drives
Controller / Driver uses 64 bit memory addressing
Base = f8825000, Irq = 21, Logical Drives = 1, Channels = 2
Version =G170:F316, DRAM = 128Mb
Controller Queue Depth = 254, Driver Queue Depth = 126

правда у меня raid10

-- 
WBR, Konstantin	      chat with ==>ICQ: 109916175
     Lepikhov,	      speak  to ==>JID: lakostis@jabber.org
aka L.A. Kostis       write  to ==>mailto:lakostis@pisem.net.nospam

...The information is like the bank... 			  (c) EC8OR



  reply	other threads:[~2003-09-29 17:00 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-09-29  8:53 [Comm] " Alexey Berezkin
2003-09-29 17:00 ` Konstantin Lepikhov [this message]
2003-09-30  7:21   ` [Comm] " Alexey Berezkin
2003-09-30 19:03     ` Konstantin Lepikhov
2003-10-01  8:50       ` Alexey Berezkin
2003-10-02 19:04         ` Konstantin Lepikhov

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