On Tuesday, 6 March 2018 6:29:11 PM AEDT Craig Sanders via luv-main wrote:
> On Mon, Mar 05, 2018 at 10:54:10PM +1100, Andrew Pam wrote:
> > [ ... ] it's also possible to set up mirroring using LVM, btrfs or ZFS
> > if you prefer.
>
> With btrfs or ZFS it's easy to add additional drives for more space later.
With ZFS you only add them one RAID set at a time and after adding that RAID
set can't be changed. You can't just add a disk at a time as you do with
BTRFS.
Last time I checked BTRFS RAID-5 and RAID-6 wasn't reliable IMHO.
> Also, both btrfs and ZFS support transparent compression - which can
> greatly increase effective capacity if most of your data is uncomressed or
> poorly-compressed. Not video or audio files, for example.
The last time I ran a medium size mail server on ZFS I didn't see a lot of
compression. I think it was something like 40%. Usually large amounts of
data means video files though.
> There are so many other benefits to using either btrfs or ZFS (snapshots,
> error-detection and correction, sub-volumes aka datasets, and much more),
> that IMO there's little reason to use a plain RAID-1 + ext4 partition for
> anything except a separate /boot.
Particularly as the most common errors are silent corruption which can't be
detected by a plan RAID and can only be stopped by BTRFS or ZFS. Sucks for
people who don't use Unix.
> ZFS has the advantage of more features, and greater reliability. It's not
> built in to the kernel, but most distros have the kernel module packaged as
> a dkms package (ubuntu and a few others take the legally dubious stance
> that the CDDL vs GPL license conflict isn't a problem, so include ZFS
> pre-compiled with their kernels already).
I don't think it's legally dubious. Oracle know exactly what they are doing,
if Oracle thought it was bad they would have let them know.
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On Tuesday, 6 March 2018 10:52:35 PM AEDT Andrew Greig via luv-main wrote:
> Sorry about that digression. So is there a platform that handles RAID
> really well? I went to OpenSuse for mapping. But now photography is my
> main work, so maybe I should be looking at installing the distro which
> is preferrred by developers of the GIMP and also Darktable.
If you want to have root on a ZFS RAID then Ubuntu is likely to be the best
option. But I recommend not doing that, it's more pain than you want IMHO.
> I just can't afford to fiddle for two weeks to get a result. And the
> OpenSuse and Ubuntu fora have freaked me out, somewhat.
Setup a mdadm RAID-1 for /boot (and root in the case of ZFS) and then use ZFS
or BTRFS for the rest.
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
Hi all,
My desktop computer hard drive is now full. I have offloaded a couple
of hundred Gb to an external expansion drive to give me breathing space.
So I am looking at keeping sda and if possible adding sdb and sdc as a
RAID arrangement, from my reading I am leaning toward a software RAID 1
(mirrored drive) using SATA drives. I am progressing further along my
intended path of returning to professional photography so data security
is now imperative.
Can I keep sda as my boot disk and just run sdb and sdc for data storage?
sda is 1Tb and sdb and sdc are identical Seagate SATA drives of 2Tb each.
I run OpenSuse Tumbleweed. I was intending to get an SSD of 500Gb for
my post production work with output being stored only on RAID.
Am I on the right track here or do I have incorrect expectations?
Many thanks
Andrew Greig
Dear List
Is anybody using a Raspberry Pi for teaching coding, hardware or any other application in a school? I have been asked to investigate the possibility. Thanks in advance.
Joe
Joe Said
VCE IT / Mathematics / Science Teacher
Assistant Daily Organiser
Rosehill Secondary College
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