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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.
> >
> ___________________________________________________________________________
> > Philadelphia Linux Users Group --
> http://www.phillylinux.org
> > Announcements -
> http://lists.phillylinux.org/mailman/listinfo/plug-announce
> > General Discussion --
> http://lists.phillylinux.org/mailman/listinfo/plug
> ___________________________________________________________________________
> Philadelphia Linux Users Group --
> http://www.phillylinux.org
> Announcements -
> http://lists.phillylinux.org/mailman/listinfo/plug-announce
> General Discussion --
> http://lists.phillylinux.org/mailman/listinfo/plug
>
>
>
>
> ___________________________________________________________________________
> Philadelphia Linux Users Group -- http://www.phillylinux.org
> Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
> General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug
- --
# 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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___________________________________________________________________________
Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
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