Carl Johnson on 8 Oct 2010 04:12:53 -0700

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

  • From: Carl Johnson <>
  • To: Philadelphia Linux User's Group Discussion List <>,
  • Subject: Re: [PLUG] CentOS 5 on >2TB disks
  • Date: Fri, 08 Oct 2010 07:12:57 -0400
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Why not stick /boot on a usb drive? Sounded plausible to me.

"JP Vossen" <> 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 
>Is anyone booting Linux (esp. CentOS) on a boot device larger than 2TB? 
>  Grub2 for CentOS?  Clues?
>JP Vossen, CISSP            |:::======|
>My Account, My Opinions     |=========|
>"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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