Re: How many of you use S.A.M.E?
- From: "Christian Antognini" <Christian.Antognini@xxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 2 Feb 2007 12:00:32 +0100
> 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@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@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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