[mdlug] Linux VMs - virtual disk best practices

[Michael ORourke]

Okay... just so I understand this correctly.

I should align my virtual partition with the virtual cylinder boundaries on 
the virtual disk which is in the virtual machine which is carved out of the 
datastore.  The datastore is a volume which maps back to a PERC controller 
which consists of a RAID volume of x# disks which maps back to a logical 
C/H/S geometry on the physical disks..

Hmmm... seems pretty clear to me.  :-)

-Mike

----- Original Message ----- 
From: "Dan Pritts" <danno at dogcheese.net>
To: "MDLUG's Main discussion list" <mdlug at mdlug.org>
Sent: Friday, March 22, 2013 11:07 AM
Subject: Re: [mdlug] Linux VMs - virtual disk best practices


>
> On Mar 22, 2013, at 10:35 AM, Dan Pritts <danno at dogcheese.net> wrote:
>
>> This is an issue on modern individual hard disks too; new large disks use 
>> 4KB sectors.  Make sure any filesystems you create use 4K or larger block 
>> sizes, and that your filesystems end up on 4K boundaries.
>>
>> The current rule of thumb for partition layout is to have your first 
>> partition start at 1MB into the disk. That seems pretty safe to me. 
>> Doesn't really fix any issues on the underlying storage, though.
>
> What I was attempting to say was that having your first partition start at 
> 1MB into a disk is great when you are on a physical disk, and it should 
> work great for 4KB sectors.  Or 64KB sectors or whatever in another 10 
> years.
>
> "doesn't really fix any issues on the underlying storage"...
>
> What I meant to write was that putting the first partition on a virtual 
> disk at 1MB is great, but if the underlying storage is not properly 
> aligned, having proper alignment on the virtual disk doesn't help.
>
>
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