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Re: How many of you use S.A.M.E?

From: Christian Antognini <Christian.Antognini_at_trivadis.com>
Date: Fri, 2 Feb 2007 12:00:32 +0100
Message-ID: <F2C9CCA71510B442AF71446CAE8AEBAF9CC095@MSXVS04.trivadis.com>


> By the way have you tried by chance what Loaiza suggested,
> putting data in specfic physical sectors of a hard drive?
> I am really curious how can that be achieved. S.A.M.E is
> simple but putting data as he says makes life impossible
> dont you think so?

Hi

I'm just formatting a new SAS disk, therefore here an example...

With fdisk I divided the disk in 4 partitions which have the same size. Basically for each of them I simply specify the start/end cylinders.

At the end I have the following situation:

[root_at_helicon .vnc]# fdisk -l /dev/sda

Disk /dev/sda: 73.4 GB, 73407820800 bytes 255 heads, 63 sectors/track, 8924 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        2231    17920476   83  Linux
/dev/sda2            2232        4463    17928540   83  Linux
/dev/sda3            4464        6695    17928540   83  Linux
/dev/sda4            6696        8924    17904442+  83  Linux

And here a quick performance test with hdparm:

[root_at_helicon .vnc]# hdparm -t /dev/sda?

/dev/sda1:
 Timing buffered disk reads: 252 MB in 3.01 seconds = 83.73 MB/sec

/dev/sda2:
 Timing buffered disk reads: 234 MB in 3.01 seconds = 77.62 MB/sec

/dev/sda3:
 Timing buffered disk reads: 214 MB in 3.00 seconds = 71.27 MB/sec

/dev/sda4:
 Timing buffered disk reads: 190 MB in 3.01 seconds = 63.22 MB/sec

HTH
Chris

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Received on Fri Feb 02 2007 - 05:00:32 CST

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