[CentOS] C7: How to configure raid at install time

Thu Nov 19 22:57:24 UTC 2015
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On Thu, November 19, 2015 4:49 pm, Devin Reade wrote:
> --On Thursday, November 19, 2015 11:54:19 AM -0700 Warren Young
> <wyml at etr-usa.com> wrote:
>> ?Twas *progress* that made it so, specifically the fact
>> that even a throwaway USB key has enough space to hold the complete OS
>> on
>> it these days.
> For the record, size of the disk was never the original motivation for
> keeping / separate, at least within my memory; it was to minimize the
> amount of disk space that needed to be fsck'd before bringing the system
> to single user mode without needing to revert to "rescue media"

Not only. Separation of / /var /usr /home (/var/mail, ...) also was a
protection from local user [accidental] denial of service attack by
preventing him from filling up or running out of inodes these filesystems.


> (at
> that time, the 125MB tape on which the OS was shipped). Even in the days
> of
> SunOS 3 (that's SunOS, not Solaris) I was installing the entire OS on
> one physical drive, partitioned.  Sure, NFS and USENET servers had many
> drives, but most machines were single drives.
> Beyond that, I don't really want to get into a flame war on stuff
> that has been hashed through before.
> The main message is that while CentOS 6 and before *could* have
> / and /usr on different filesystems, don't do it with CentOS 7
> per <https://access.redhat.com/solutions/53005> (paywalled).
> TL;DR: you'll have trouble booting some configurations including
> those using iSCSI.
> Devin
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247