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 administrative variations for a dual-CPU system or do I
ju
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 admi
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 a
>> 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 b
>> 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 b
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
>> 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 wou
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.
--
Rega
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 i
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
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
>>> 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
>> 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
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 f
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 depen
On 2013-09-13 4:00 PM, 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 2013-09-14 4:50 AM, Grant 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 existing drives."
On 2013-09-13 5:47 PM, Grant 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 SAS drives, vs 7200 SA
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 uptim
>> 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 con
>> 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 R
>> 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 respon
On 2013-09-15 7:15 AM, Grant 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 50+% of the potential
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
On Sun, Sep 15, 2013 at 6:10 PM, 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, sin
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 hardw
>>> 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 typ
>> 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 con
On Tue, Sep 17, 2013 at 2:28 PM, 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, sin
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 g
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 hardw
On 2013-09-17 1:36 AM, Pandu Poluan wrote:
On Sun, Sep 15, 2013 at 6:10 PM, Grant 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 concern that ZFS' license (CDDL) is not comp
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, sinc
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 dis
>> 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 se
>> 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 mirro
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
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 virtu
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