On Tue, 14 Dec 2010, Jason T. Slack-Moehrle wrote:
> Hi All,
>
> I have a new system with 2 Seagate 1TB SATA Enterprise level drives
> in it.
>
> I want to RAID1 (mirror) these drives. <snip/>
>
> So if I simplify, I must:
> 1. Create a software raid partition on each drive
> 2. Create a RAID 1 out of that partition and use a mount point of /boot
>
> 3. Create other mount points I might want i.e swap, /home, etc
> 4. Create RAID1 out of these partitions
>
> 5. rinse and repeat this for each mount point I want
>
> A few questions:
>
> 1. This system support 16gb of RAM. I have 9gb in it, but I will max
> it out over the next few months as I find great deals on RAM,
> what should my SWAP space be? I recall a long while ago that SWAP
> should match physical RAM.
>
> 2. Any reason I can't just create a single mount point taking up the
> entire drive and RAID1 the entire thing? Can anyone recommend
> some ideal mount points and sizes?
>
> 3. What should I account for if my /var/www/html will be very large?
If you have time to experiment a bit, I'd highly suggest encapsulating
your RAID design in a kickstart file. You'll need to do some up-front
work to get it ready, but once it's done you can re-do your
arrangement easily (and repeat as necessary). Here's a sample (that
requires two identical drives):
# disk work
bootloader --location=mbr
clearpart --all --initlabel
part raid.01 --size=300 --ondisk=hda --asprimary
part raid.02 --size=300 --ondisk=hdb --asprimary
part raid.11 --size=1024 --ondisk=hda --asprimary
part raid.12 --size=1024 --ondisk=hdb --asprimary
part raid.21 --size=20000 --ondisk=hda --asprimary
part raid.22 --size=20000 --ondisk=hdb --asprimary
part raid.31 --size=1 --ondisk=hda --asprimary --grow
part raid.32 --size=1 --ondisk=hdb --asprimary --grow
# mirrored mountpoints
raid /boot --fstype ext3 --level=RAID1 --device=md0 raid.01 raid.02
raid swap --fstype swap --level=RAID1 --device=md1 raid.11 raid.12
raid / --fstype ext3 --level=RAID1 --device=md2 raid.21 raid.22
raid /srv --fstype ext3 --level=RAID1 --device=md3 raid.31 raid.32
There are many, many ways to alter this setup (e.g., using LVM, using
a different set of mount points, not relying on primary partitions).
The reason that /srv gets the lion's share of the disk is that I try
to differentiate between files
* created/maintained by running processes (e.g., MySQL)
* installed by RPM (e.g., /var/www/error)
both of which belong in /var, and
* data created elsewhere and "fed" to a process (e.g., your
video files or HTML pages)
which goes into /srv.
--
Paul Heinlein <> heinlein@xxxxxxxxxx <> http://www.madboa.com/
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