Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the complexity
of RAID+LVM, since ZFS best practice is to set your hardware raid controller
If it's Type 2, then four drives with a spare is equally tolerant.
Slightly better, even, if you take into account the reduced probability
of 2/5 of the drives failing compared to 2/6.
Thank you very much for this info. I had no idea. Is there another
label for these RAID types besides
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the complexity
of RAID+LVM, since ZFS best practice is to set your hardware raid controller
On Tue, Sep 17, 2013 at 2:28 PM, Grant emailgr...@gmail.com wrote:
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the complexity
of
On Tue, 17 Sep 2013 12:36:20 +0700, Pandu Poluan wrote:
That said, if your kernel supports modules, it's a piece of cake to
compile the ZFS modules on your own. @ryao has a zfs-overlay you can
use to emerge ZFS as a module.
It's also in the main portage tree.
--
Neil Bothwick
Get your
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the complexity
of RAID+LVM, since ZFS best practice is to set your hardware raid controller
On 2013-09-17 1:36 AM, Pandu Poluan pa...@poluan.info wrote:
On Sun, Sep 15, 2013 at 6:10 PM, Grant emailgr...@gmail.com wrote:
It sounds like ZFS isn't included in the mainline kernel. Is it on its way in?
Unlikely. There has been a discussion on that in this list, and there
is some
On 17/09/2013 11:49, Grant wrote:
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the complexity
of RAID+LVM, since ZFS best practice is to
On 09/17/2013 02:43 AM, Grant wrote:
Is multi-mirroring (3-disk RAID1) support without RAID0 common in
hardware RAID cards?
Nope. Not at my pay grade, anyway. The only ones I know of are the
Hewlett-Packard MSA/EVA, but they don't call it plain RAID1. They allow
you to create virtual disk
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the complexity
of RAID+LVM, since ZFS best practice is to set your hardware raid
Is multi-mirroring (3-disk RAID1) support without RAID0 common in
hardware RAID cards?
Nope. Not at my pay grade, anyway. The only ones I know of are the
Hewlett-Packard MSA/EVA, but they don't call it plain RAID1. They allow
you to create virtual disk groups, though, so you can mirror a
On 17/09/2013 15:11, Grant wrote:
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the
complexity
of RAID+LVM, since ZFS best practice is
On 17/09/2013 15:13, Grant wrote:
Is multi-mirroring (3-disk RAID1) support without RAID0 common in
hardware RAID cards?
Nope. Not at my pay grade, anyway. The only ones I know of are the
Hewlett-Packard MSA/EVA, but they don't call it plain RAID1. They allow
you to create virtual disk
Instead, how about a 6-drive RAID 10 array with no hot spare? My
guess is this would mean much greater fault-tolerance both overall and
during the rebuild process (once a new drive is swapped in). That
would mean not only potentially increased uptime but decreased
monitoring responsibility.
On 2013-09-15 7:15 AM, Grant emailgr...@gmail.com wrote:
You would prefer 4-drive RAID 10 plus a hot spare to 6-drive RAID 10?
Isn't 6-drive RAID 10 superior in every way except for cost (1 extra
drive)?
I would prefer X-drive RAID10 plus hot spare in *any* situation.
But, this always loses
On 09/16/2013 02:49 AM, Grant wrote:
If it's Type 2, then four drives with a spare is equally tolerant.
Slightly better, even, if you take into account the reduced probability
of 2/5 of the drives failing compared to 2/6.
Thank you very much for this info. I had no idea. Is there another
On Sun, Sep 15, 2013 at 6:10 PM, Grant emailgr...@gmail.com wrote:
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the complexity
of
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the complexity
of RAID+LVM, since ZFS best practice is to set your hardware raid controller
http://blog.open-e.com/why-a-hot-spare-hard-disk-is-a-bad-idea/
Based on our long years of experience we have learned that during a
RAID rebuild the probability of an additional drive failure is quite
high – a rebuild is stressful on the existing drives.
This is NOT true on a RAID 10... a
On 13/09/2013 23:39, Grant wrote:
Exactly what RAID controller are you getting?
My personal rule of thumb: on-board RAID controllers are not worth the
silicon they are written on. Decent hardware raid controllers do exist,
but they plug into big meaty slots and cost a fortune. By a
Would the hot spare be in case I lose 2 drives at once? Isn't that
extraordinarily unlikely?
Not really. One fails and you don't notice for a while, or it takes a while
to
recover from it. Then a second one fails. You're up queer street.
I like to do RAID6 now because I've been burned by
Are modern SSDs reliable enough to negate the need for mirroring or do
they still crap out?
I don't have any experience with SSDs, but a general principle: ignore
what anyone says, mirror them anyway, and make lots of backups.
I'm onboard with that.
- Grant
Exactly what RAID controller are you getting?
My personal rule of thumb: on-board RAID controllers are not worth the
silicon they are written on. Decent hardware raid controllers do exist,
but they plug into big meaty slots and cost a fortune. By a fortune I
mean a number that will make
On 14/09/2013 10:54, Grant wrote:
Exactly what RAID controller are you getting?
My personal rule of thumb: on-board RAID controllers are not worth the
silicon they are written on. Decent hardware raid controllers do exist,
but they plug into big meaty slots and cost a fortune. By a fortune I
I'm told it will likely be an Adaptec 7000 series controller.
Can a controller like that handle a 6-drive RAID 10 array?
Is a hot spare handled by the controller or is it configured in the OS?
The problem with questions of that nature is that the answer is always
It depends
With
On 2013-09-13 4:00 PM, Grant emailgr...@gmail.com wrote:
Is the Gentoo Software RAID + LVM guide the best place for RAID
install info if I'm not using LVM and I'll have a hardware RAID
controller?
Not ready to take the ZFS plunge? That would greatly reduce the
complexity of RAID+LVM, since
On 2013-09-14 4:50 AM, Grant emailgr...@gmail.com wrote:
http://blog.open-e.com/why-a-hot-spare-hard-disk-is-a-bad-idea/
Based on our long years of experience we have learned that during a
RAID rebuild the probability of an additional drive failure is quite
high – a rebuild is stressful on the
On 2013-09-13 5:47 PM, Grant emailgr...@gmail.com wrote:
Are modern SSDs reliable enough to negate the need for mirroring or do
they still crap out?
You definitely want to mirror, but I'd be very interested in some
statistics comparing rebuild times on a RAID5 and RAID 6 with SSD's, vs
15K
On 09/14/2013 04:50 AM, Grant wrote:
Instead, how about a 6-drive RAID 10 array with no hot spare? My
guess is this would mean much greater fault-tolerance both overall and
during the rebuild process (once a new drive is swapped in). That
would mean not only potentially increased uptime
On 13/09/2013 22:00, Grant wrote:
It's time to switch hosts. I'm looking at the following:
Dual Xeon E5-2690
32GB RAM
4x SSD RAID10
This would be my first experience with multiple CPUs and RAID. Advice
on any of the following would be greatly appreciated.
Are there any
On 09/13/2013 04:00 PM, Grant wrote:
It's time to switch hosts. I'm looking at the following:
Dual Xeon E5-2690
32GB RAM
4x SSD RAID10
This would be my first experience with multiple CPUs and RAID. Advice
on any of the following would be greatly appreciated.
Are there any
It's time to switch hosts. I'm looking at the following:
Dual Xeon E5-2690
32GB RAM
4x SSD RAID10
This would be my first experience with multiple CPUs and RAID. Advice
on any of the following would be greatly appreciated.
Is the Gentoo Software RAID + LVM guide the best place for RAID
It's time to switch hosts. I'm looking at the following:
Dual Xeon E5-2690
32GB RAM
4x SSD RAID10
This would be my first experience with multiple CPUs and RAID. Advice
on any of the following would be greatly appreciated.
Is the Gentoo Software RAID + LVM guide the best place for RAID
On 09/13/2013 09:00 PM, Grant wrote:
It's time to switch hosts. I'm looking at the following:
Dual Xeon E5-2690
32GB RAM
4x SSD RAID10
nice
Can I count on this system to keep running if I lose an SSD?
if a built in raid controller, yes. one thing you might want to check is
linux tools for
It's time to switch hosts. I'm looking at the following:
Dual Xeon E5-2690
32GB RAM
4x SSD RAID10
nice
Can I count on this system to keep running if I lose an SSD?
if a built in raid controller, yes. one thing you might want to check is
linux tools for management -- you wouldn't want to
On Friday 13 Sep 2013 14:47:35 Grant wrote:
Would the hot spare be in case I lose 2 drives at once? Isn't that
extraordinarily unlikely?
Not really. One fails and you don't notice for a while, or it takes a while to
recover from it. Then a second one fails. You're up queer street.
--
On 09/13/2013 03:47 PM, Peter Humphrey wrote:
On Friday 13 Sep 2013 14:47:35 Grant wrote:
Would the hot spare be in case I lose 2 drives at once? Isn't that
extraordinarily unlikely?
Not really. One fails and you don't notice for a while, or it takes a while
to
recover from it. Then a
On 09/13/2013 05:47 PM, Grant wrote:
I had no idea. How awesome. So the entire array shows up as /dev/sda
when using a real hardware controller? Just enable an extra kernel
config option or two and it works?
Yep.
Yes. RAID10 both stripes and mirrors. So you can lose one, and it's
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