PERC 6i and Incorrect drive size

[Harald_Jensas at Dell.com]

Hi,

No, most likely not.

This is the info I could find:


SAS 5/iR - RAID Disk Data Format = LSI SSP

PERC 5 - RAID Disk Data Format = Common DDF, Profile 1
PERC 6 - RAID Disk Data Format = Common DDF, Profile 1 


As you can see the SAS 6/iR does not use DDF, so the SAS 5iR does not exhibit the same behavior.


--
Harald Jensås


> -----Original Message-----
> From: Elazar Broad [mailto:elazar at hushmail.com]
> Sent: 05 October 2008 21:51
> To: Jensas, Harald
> Cc: linux-poweredge-Lists
> Subject: RE: PERC 6i and Incorrect drive size
> 
> Ah! Thanks Harald! Now let me ask you, does the SAS/5ir exhibit the
> same behavior?
> 
> Elazar
> 
> On Sun, 05 Oct 2008 18:26:13 +0000 Harald_Jensas at Dell.com wrote:
> >Hi Patrick,
> >
> >You are seeing 512 MB less space available on each drive when
> >using the PERC controller. This is because the PERC Controller use
> >the DDF - Data Disk Format.
> >
> >DDF is a SNIA standard on how data is formatted on RAID Disk
> >Groups. The standard specify that a minimum of 32 MB of space must
> >be reserved on each disk in the RAID Group for the DDF structure.
> >In the PERC case the designers decided to reserve 512 MB for the
> >DDF structure, on each disk in the RAID group. I am not sure why,
> >but I guess to be sure not to run out of space when new/more
> >features are added. Another reason to go for such a large space is
> >to make sure one can keep backward compatibility for a long
> >time... etc.
> >
> >
> >You can read about DDF here:
> >http://www.snia.org/tech_activities/standards/curr_standards/ddf/SN
> >IA-DDFv1.2.pdf
> >
> >
> >--
> >Harald Jensås
> >
> >> -----Original Message-----
> >> From: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-
> >> bounces at dell.com] On Behalf Of Elazar Broad
> >> Sent: 05 October 2008 05:20
> >> To: linux-poweredge-Lists; Boyd, Patrick
> >> Subject: RE: PERC 6i and Incorrect drive size
> >>
> >> Hi Patrick,
> >>  Thanks for the reply. I am aware of that. My issue is more of
> >how
> >> the PERC controller reports the drive size to the OS. Like so:
> >If I
> >> plug one of the drives into the PowerEdge 1800's onboard CERC2/s
> >> controller, fdisk reports the drive as having
> >640.1GB/1,250,263,728
> >> sectors. On the other hand, fdisk on a PERC6i virtual
> >disk(RAID1)
> >> reports 639.5GB/1,249,116,159 sectors. What I want to know is,
> >why
> >> is there 500MB+ missing when using the PERC6i controller?
> >> Additionally, on a clean install of VMWare's ESXi the included
> >> partedUtil complains about the geometry reported by the
> >> controller's BIOS.
> >>
> >> Elazar
> >>
> >> On Fri, 03 Oct 2008 13:35:48 +0000 Patrick_Boyd at Dell.com wrote:
> >> >The drive manufactures measure drive size in base 10, i.e. a KB
> >is
> >> >1000
> >> >bytes, a MB is 1000 KB, and a GB is 1000 MB.
> >> >
> >> >Software measures drive size in base 2, i.e. a KB is 1024
> >bytes, a
> >> >MB is
> >> >1024 KB, and a GB is 1024 MB.
> >> >
> >> >That is the discrepancy that you are seeing.
> >> >
> >> >-----Original Message-----
> >> >From: linux-poweredge-bounces at dell.com
> >> >[mailto:linux-poweredge-bounces at dell.com] On Behalf Of Elazar
> >> >Broad
> >> >Sent: Friday, October 03, 2008 3:27 AM
> >> >To: linux-poweredge-Lists
> >> >Subject: PERC 6i and Incorrect drive size
> >> >
> >> >I know this is slightly off topic. I have a PERC 6i in a
> >PE1800, I
> >> >
> >> >have 2 WD 640GB drives connected to the controller. When
> >booting,
> >> >if I hit Ctrl+R to access the configuration utility, both
> >drives
> >> >only show as 609620MB as opposed to 640000. Any ideas are
> >greatly
> >> >appreciated...
> >> >
> >> >Elazar
> >> >
> >> >--
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> >> >education.
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> >> >U87Gn
> >> >wBUIotXmZhbFX/
> >> >
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