Re: How to improve db performance with $7K?

From: Vivek Khera <vivek(at)khera(dot)org>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: How to improve db performance with $7K?
Date: 2005-04-15 16:10:14
Message-ID: fff6340b58e9d740bac7f082be46fa07@khera.org
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On Apr 15, 2005, at 11:58 AM, Joshua D. Drake wrote:

>> ALL disks have bad blocks, even when you receive them. you honestly
>> think that these large disks made today (18+ GB is the smallest now)
>> that there are no defects on the surfaces?
>
> That is correct. It is just that the HD makers will mark the bad blocks
> so that the OS knows not to use them. You can also run the bad blocks
> command to try and find new bad blocks.
>

my point was that you cannot assume an linear correlation between block
number and physical location, since the bad blocks will be mapped all
over the place.

Vivek Khera, Ph.D.
+1-301-869-4449 x806

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