Re: Does solaris require disks to be zeroed before using
From: David A.Lethe (davidATsantools.com)
Date: 09/24/04
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Date: Fri, 24 Sep 2004 14:10:48 -0500
On 23 Sep 2004 22:31:46 GMT, Scott Howard <scott@hunterlink.net.au>
wrote:
>David A.Lethe <davidATsantools.com> wrote:
>> This is causing some issues at our company, and we can't get any
>> definitive answers. Is there any requirement, or even best-practices
>> policies that SCSI and/or fibre channel disk drives need to have all
>> zeros written to them before partitioning and building a file system
>> on them?
>
>In a word, no.
>
>Solaris will never attempt to read a block of data which it hasn't
>previously written something to.
>
> Scott
Not true, and this explains the whole point of the question.
Example .. .when you run the format command. Obviously it doesn't
write before reading, or every time you ran it, it would blow the
partitions away ;)
This brings up the reason for the question to begin with. The test
suites don't wipe the disks clean, and we had what might have been a
zillion-to-one shot where fdisk (on LINUX) exited with an invalid
partition error when the sysadmin tried to partition things.
After I figured out problem wasn't hardware related, and using dd to
blow the first few MB of the disk away, we have to deal with problem
prevention ... do we adjust testing utilties to insure that all or
part of the disk is zeroed before we let people use the disks.
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