[rhelv6-beta-list] Can RHEL6 installer align the disk partition with 4k-sector or raid stripe size?

[Pasi Kärkkäinen]

On Thu, Jun 10, 2010 at 01:40:33PM -0500, Steve Bonneville wrote:
> Actually, I am seeing the RHEL 6 beta installer aligning partition 1
> to start at a +1M offset:
> 
>    [root at localhost ~]# fdisk -uc /dev/sda
> 
>    Command (m for help): p
> 
>    Disk /dev/sda: 320.1 GB, 320072933376 bytes
>    255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
>    Units = sectors of 1 * 512 = 512 bytes
>    Sector size (logical/physical): 512 bytes / 512 bytes
>    I/O size (minimum/optimal): 512 bytes / 512 bytes
>    Disk identifier: 0x0005d392
> 
>       Device Boot      Start         End      Blocks   Id  System
>    /dev/sda1   *        2048     1026047      512000   83  Linux
>    /dev/sda2         1026048   625141759   312057856   8e  Linux LVM
> 

Oh nice, so RHEL6 does the alignment properly too. Good.

-- Pasi

> When I did the install, I *did* have the installer remove all existing
> partitions on the disk, so that could have fixed the old partition table.  
> If I had not done that, it wouldn't surprise me to see /dev/sda1 still 
> start at LBA 63 (from the previous RHEL 5 installation).
> 
> Not sure why it's not happening in your case.
> 
> In the RHEL 6 beta fdisk command, -u switches to sectors and -c turns 
> off the obsolete DOS compatibility cylinder alignment warnings. 
> 
>   -- Steve
> 
> Kirby Zhou wrote:
> > Are you sure?
> > I think RHEL6 installer does not align partitions.
> > 
> > ~]# parted /dev/sda unit kib print
> > Model: IBM ServeRAID M5014 (scsi)
> > Disk /dev/sda: 291991552kiB
> > Sector size (logical/physical): 512B/512B
> > Partition Table: msdos
> > 
> > Number  Start      End           Size          Type     File system  Flags
> >  1      31.5kiB    200812kiB     200781kiB     primary  ext4         boot
> >  2      200813kiB  291989407kiB  291788595kiB  primary               lvm
> > 
> > Regards,
> >    Kirby Zhou    
> >    from   SOHU-RD   +86-10-6272-8261
> > 
> > -----Original Message-----
> > From: rhelv6-beta-list-bounces at redhat.com
> > [mailto:rhelv6-beta-list-bounces at redhat.com] On Behalf Of Pasi K?rkk?inen
> > Sent: Thursday, June 10, 2010 3:48 AM
> > To: Red Hat Enterprise Linux 6 (Santiago) Beta releases discussion
> > mailing-list
> > Subject: Re: [rhelv6-beta-list] Can RHEL6 installer align the disk partition
> > with 4k-sector or raid stripe size?
> > 
> > On Mon, Jun 07, 2010 at 07:37:28PM -0400, Nico Kadel-Garcia wrote:
> > 
> > at least Fedora 13 installer aligns partitions to 2 MB starting offset
> > (iirc),
> > even when the drive has 512 bytes per sector. I assume RHEL6 installer does
> > the same.
> > 
> > No mis-alignment there, like RHEL5 installer has (the famous offset 63
> > issue).
> > 
> > -- Pasi
> 
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