Eric at Lucii.org on 8 Oct 2010 06:42:01 -0700


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Re: [PLUG] CentOS 5 on >2TB disks


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I had not heard of GPT until your post.

  http://en.wikipedia.org/wiki/GUID_Partition_Table

Very interesting!

Eric

On 10/08/2010 08:34 AM, Gordon Dexter wrote:
> Have you considered making a hybrid MBR?  This means you have both a GPT
> and an MBR partition table.  The GPT is in a different location so tools
> designed for MBR don't interfere with it.  Normally when you have a GPT
> the MBR is initialized to contain one partition, spanning the entire
> disk, of type 0xEE (GPT).  But there are tools designed to copy the
> layouts of the first four partitions from the GPT to the MBR so that
> older tools can still work.  I'm not sure what effect this has on how
> the kernel reads the partition table on >2TB disks, but it's worth
> looking into.
> 
> --Gordon
> 
> On Fri, Oct 8, 2010 at 7:13 AM, Doug Stewart <zamoose@gmail.com
> <mailto:zamoose@gmail.com>> wrote:
> 
>     Why not map an LVM on top for everything with a single non-LVM
>     partition cut for /boot at ~100MB?
> 
>     --
>     Doug Stewart
> 
>     On Oct 8, 2010, at 1:23 AM, JP Vossen <jp@jpsdomain.org
>     <mailto:jp@jpsdomain.org>> wrote:
> 
>     > I have a case where I need to have LOTS of space in some servers.
>      Right now we're using Dell PE R710's with 6x 1TB drives like:
>     >    1+1 RAID1 mirror = ~1TB
>     >    4x  RAID5 = ~3TB
>     >
>     > The 1+1 mirror is a total waste, since all it has is the OS and
>     some apps.  I'd much rather use all 6 drives in RAID5 for ~5TB.
>     >
>     > But if I do that, the boot device is >2TB and so the stock grub1
>     will barf.  And grub2 doesn't seem to be in the repos, and it's
>     still a bit unclear to me if it can boot >2TB.  (I *think* it can,
>     but...)  I'm not sure I really think grub2 is mature enough for
>     critical production, but it it's the only game in town...
>     >
>     > I'm also not sure if there are any kernel issues with this.  Right
>     now I'm using the stock CentOS kernel, but at some point I want to
>     move to a custom, monolithic kernel.
>     >
>     > Throwing different hardware at the problem is a possibility.  The
>     R710's are maxed out for drives, and I'm don't think there's a
>     CF-Card or other option to stick the OS on so it's less than 2TB.
>      We're looking into R510's or something that can have more drives,
>     so we might get smaller OS drives internally and leave the
>     externally accessible ones for a big RAID.  But sooner or later I'm
>     gonna need to deal with this on the R710s too.
>     >
>     > Is anyone booting Linux (esp. CentOS) on a boot device larger than
>     2TB?  Grub2 for CentOS?  Clues?
>     >
>     > Thanks,
>     > JP
>     > ----------------------------|:::======|-------------------------------
>     > JP Vossen, CISSP            |:::======|      http://bashcookbook.com/
>     > My Account, My Opinions     |=========|      http://www.jpsdomain.org/
>     > ----------------------------|=========|-------------------------------
>     > "Microsoft Tax" = the additional hardware & yearly fees for the add-on
>     > software required to protect Windows from its own poorly designed and
>     > implemented self, while the overhead incidentally flattens Moore's
>     Law.
>     >
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> 
> 
> 
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- -- 
#  Eric Lucas
#
#                "Oh, I have slipped the surly bond of earth
#                 And danced the skies on laughter-silvered wings...
#                                        -- John Gillespie Magee Jr
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