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 -CfgEachDskRaid0 Direct
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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
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
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
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 the
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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 any one
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 performance
for the
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 that
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
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 and
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
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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.
- --
Jesus Cea Avion
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.
I
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 massive
[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)
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 that is presented as a single
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