> With my (COTS) LSI 1068 and 1078 based controllers I get consistently
> better performance when I export all disks as jbod (MegaCli -
> CfgEachDskRaid0).
>
>
>> Is that really 'all disks as JBOD'? or is it 'each disk as a single
>> drive RAID0'?
single disk raid0:
./MegaCli -CfgEachDskRaid
Andy Lubel wrote:
> With my (COTS) LSI 1068 and 1078 based controllers I get consistently
> better performance when I export all disks as jbod (MegaCli -
> CfgEachDskRaid0).
>
>
Is that really 'all disks as JBOD'? or is it 'each disk as a single
drive RAID0'?
It may not sound different on t
Actually the point is that there are situations that occur in which the
typical software stack will make the wrong decision because it has no
concept of the underlying hardware and no fault management structure
that factors in more than just a single failed IO at a time...
Hardware RAID control
With my (COTS) LSI 1068 and 1078 based controllers I get consistently
better performance when I export all disks as jbod (MegaCli -
CfgEachDskRaid0).
I even went through all the loops and hoops with 6120's, 6130's and
even some SGI storage and the result was always the same; better
performa
Much of the complexity in hardware RAID is in the fault detection, isolation,
and management. The fun part is trying to architect a fault-tolerant system
when the suppliers of the components can not come close to enumerating most of
the possible failure modes.
What happens when a drive's perfo
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John-Paul Drawneek wrote:
| I guess a USB pendrive would be slower than a
| harddisk. Bad performance
| for the ZIL.
A "decent" pendrive of mine writes at 3-5MB/s. Sure there are faster
ones, but any desktop harddisk can write at 50MB/s.
If you are *
John-Paul Drawneek wrote:
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>> Vincent Fox wrote:
>> | So the point is, a JBOD with a flash drive in one
>> (or two to mirror
>> the ZIL) of the slots would be a lot SIMPLER.
>>
>> I guess a USB pendrive would be slower than a
>> harddisk. Bad p
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> Vincent Fox wrote:
> | So the point is, a JBOD with a flash drive in one
> (or two to mirror
> the ZIL) of the slots would be a lot SIMPLER.
>
> I guess a USB pendrive would be slower than a
> harddisk. Bad performance
> for the ZIL.
>
Does
[EMAIL PROTECTED] said:
> You still need interfaces, of some kind, to manage the device. Temp sensors?
> Drive fru information? All that information has to go out, and some in, over
> an interface of some sort.
Looks like the Sun 2530 array recently added in-band management over the
SAS (data)
Kyle McDonald wrote:
> Vincent Fox wrote:
>
>> So the point is, a JBOD with a flash drive in one (or two to mirror the
>> ZIL) of the slots would be a lot SIMPLER.
>>
>> We've all spent the last decade or two offloading functions into specialized
>> hardware, that has turned into these massiv
Vincent Fox wrote:
> So the point is, a JBOD with a flash drive in one (or two to mirror the ZIL)
> of the slots would be a lot SIMPLER.
>
> We've all spent the last decade or two offloading functions into specialized
> hardware, that has turned into these massive unneccessarily complex things.
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Vincent Fox wrote:
| So the point is, a JBOD with a flash drive in one (or two to mirror
the ZIL) of the slots would be a lot SIMPLER.
I guess a USB pendrive would be slower than a harddisk. Bad performance
for the ZIL.
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Jesus Cea Avion
So the point is, a JBOD with a flash drive in one (or two to mirror the ZIL)
of the slots would be a lot SIMPLER.
We've all spent the last decade or two offloading functions into specialized
hardware, that has turned into these massive unneccessarily complex things.
I don't want to go to a new
Vincent Fox wrote:
> When Sun starts selling good SAS JBOD boxes equipped with appropriate
> redundancies and a flash-drive or 2 for the ZIL I will definitely go that
> route. For now I have a bunch of existing Sun HW RAID arrays so I make use
> of them mainly to make sure I can package LUNs an
I package up 5 or 6 disks into a RAID-5 LUN on our Sun 3510 and 2540 arrays.
Then I use ZFS to RAID-10 these volumes.
Safety first!
Quite frankly I've had ENOUGH of rebuilding trashed filesystems. I am tired
to chasing performance like it's the Holy Grail and shoving other
considerations asi
Gregory Perry wrote:
> Hello,
>
> I have a Dell 2950 with a Perc 5/i, two 300GB 15K SAS drives in a RAID0
> array. I am considering going to ZFS and I would like to get some feedback
> about which situation would yield the highest performance: using the Perc
> 5/i to provide a hardware RAID0 t
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