[CentOS] Centos 5 on Large Disks.

Johnny Hughes johnny at centos.org
Tue Oct 23 09:14:18 UTC 2007

Anup Shukla wrote:
> James A. Peltier wrote:
>> James A. Peltier wrote:
>>> Anup Shukla wrote:
>>>> Hi All,
>>>> Sorry if this has been answered many times.
>>>> But i have been going through a lot of pages (via google search).
>>>> The more i search, the more its confusing me.
>>>> I have a server with 6 (750G each) SATA disks with H/W Raid 5.
>>>> I plan to allocate the space as follows
>>>> swap 8G
>>>> /boot 100M
>>>> / 20G
>>>> -- and remaining space to /data{1,2,3,N} (equal sizes)
>>>> However after the installation and reboot, i got an error about bad
>>>> partition for /data8
>>>> I had hit the 2T limit.
>>>> Then i found this page at
>>>> http://www.knowplace.org/pages/howtos/linux_large_filesystems_support.php
>>>> which speaks of using Parted/LVM2 and XFS.
>>>> If i understand this correctly,
>>>> I need to have 1 disk to host the CentOS installation.
>>>> And i can use the other 5 disks in a RAID array
>>>> (label type gpt...)
>>>> Is it not possible to partition and use the existing RAID 5 volume?
>>>> I really am not sure about how to proceed for this big disk problem.
>>>> Any ideas/links will really help.
>>>> Thank you.
>>>> Regards,
>>>> A.S
>>>> _______________________________________________
>>>> CentOS mailing list
>>>> CentOS at centos.org
>>>> http://lists.centos.org/mailman/listinfo/centos
>>> My understanding is that grub and lilo are not able to boot off of
>>> GPT labeled disks currently.  Given the size of currently available
>>> disks, this will probably change soon, however, for now you need a
>>> small partition to boot a large disk.
>> sorry, a bit quick off the trigger, but essentially, if you wanted to
>> use a single RAID-5 volume of this size (even if you configured it as
>> you said) the GPT label for the volume would be what gets you cuz of
>> the boot loader.
>> The use of LVM and XFS, just have to do with the way they handle
>> larger disks.  With LVM you can lay out the disks in a bit more fine
>> tuned manner that allows you go get around some limitations in certain
>> file systems.  XFS is just recommended because it is a very good
>> performer and was meant to handle large file systems from its
>> inception.  Feel free to use JFS, ReiserFS or your local don-juan-ho
>> file system you like
> I think its finally got into my head now. :)
> From what i understand (after your replies and some more googling)
> GRUB cannot boot from gpt labeled drives.
> So no matter how i partition them, it just wont boot.
> So finally, i am putting a 300G SATA to act as the "system" drive.
> Then use the other 750G's to be the big RAID 5 Volume (XFS)
> Yes, i lose if the 300G fails, but i think i can do something about that
> later.
> Thanks for the replies.

I know that XFS gets all the press about being a great performing file
system ... but if you want the best stability on CentOS, you should at
least consider ext3 instead.

I have worked very hard to get stable code for xfs in centos-4 and
centos-5, and lots of people use it, but (IMHO) ext3 is still much more
stable with the CentOS Kernels.

That is my $0.02 ... I'm sure other people will tell you I am all hosed
up :D

Johnny Hughes

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