On 10/26/2011 04:51 PM, Casey wrote:
On 10/26/11 3:44 PM, Eric Shubert wrote:
I think that with the size of HDDs these days, LVM is a layer of
complexity that has little to no benefit any more. Since you really
want everything mirrored on raid-1 anyway, I simply start with that,
then add more pairs in raid-10 if needed (as opposed to putting LVM on
top of raid-1).
That's true. The only reason I was even asking was because I put
everything into an LVM when I ran the QMT-ISO install. Thought it might
make it easier adjust partition sizes later if I needed.
It would, but adjusting partition sizes shouldn't really be necessary.
How much storage are you needing?
Well...as much as I can. Eventually my customers are going to want
larger quotas, or their companies will grow, and so will the sizes of
their mailboxes. I believe between the old Solaris server (Pop), and our
newer QMT server (Q2), there is about 180GB of user data. It might be
more, but that number sounds familiar.
A drop in the bucket. ;) I'd just put it all on a couple 2 or 3 TB
drives, and call it done for now. I'd also use commodity sata drives.
The new server I'm trying to get setup as one of the backend servers is
a Dell PowerEdge 2650, with 5x Hotswappable SCSI bays. I had 73's in
each bay, but just scored a sweet deal on 5x 146GB 15K RPM drives. I was
looking at doing RAID5, to be able to provide more storage. If I went
RAID-10, I lose a use for that 5th drive, and my capacity is reduced.
I've heard great things about RAID-5 as well as RAID-10.
IMO, raid-5 is a PITA. It used to be "fashionable" and still is in some
circles, but I think its time has come and gone. Raid-5 isn't worth the
overhead any more, given the price of large capacity drives. With the
setup you have, I'd use 4 drives in raid-10 with one hot spare.
My original thought was to set aside 50GB for the root partition, and
then use the rest for for my mailstore. What would you recommend? I'm
also trying to find away to get this new box setup and then bring Q2 in
as the secondary backend server, without having to reinstall everything.
You don't need anywhere near that for the root partition. 8G is more
than enough. This server handles a light load, but you get the picture:
[shubes@tacs-wan ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 6.7G 2.1G 4.3G 33% /
/dev/sda1 99M 22M 72M 24% /boot
tmpfs 252M 0 252M 0% /dev/shm
tacs-udat:/mnt/stor/udat/mail
55G 5.8G 46G 12%
/net/tacs-udat/mnt/stor/udat/mail
I'd do a raid-1 for boot, raid-1 for /, and the rest on raid-10 for the
mail store. Note, don't be deceived by the above. It's a VM that's
sitting on raid-1. ;)
--
-Eric 'shubes'
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