I recently got a chance to test SW RAID5 using 750GB disks (10) in a RAID5
on a 3ware card, model no: 9550SXU-12
The bottom line is the controller is doing some weird caching with writes
on SW RAID5 which makes it not worth using.
Recall, with SW RAID5 using regular SATA cards with (mind
Justin Piszcz wrote:
UltraDense-AS-3ware-R5-9-disks,16G,50676,89,96019,34,46379,9,60267,99,5010
98,56,248.5,0,16:10:16/64,240,3,21959,84,1109,10,286,4,22923,91,544,6
UltraDense-AS-3ware-R5-9-disks,16G,49983,88,96902,37,47951,10,59002,99,529
On Wed, Jul 18, 2007 at 06:23:25AM -0400, Justin Piszcz wrote:
I recently got a chance to test SW RAID5 using 750GB disks (10) in a RAID5
on a 3ware card, model no: 9550SXU-12
The bottom line is the controller is doing some weird caching with writes
on SW RAID5 which makes it not worth
On Wed, 18 Jul 2007, Gabor Gombas wrote:
On Wed, Jul 18, 2007 at 06:23:25AM -0400, Justin Piszcz wrote:
I recently got a chance to test SW RAID5 using 750GB disks (10) in a RAID5
on a 3ware card, model no: 9550SXU-12
The bottom line is the controller is doing some weird caching with writes
On Wed, 18 Jul 2007, Giuseppe Ghibò wrote:
Justin Piszcz ha scritto:
I recently got a chance to test SW RAID5 using 750GB disks (10) in a RAID5
on a 3ware card, model no: 9550SXU-12
The bottom line is the controller is doing some weird caching with writes
on SW RAID5 which makes it not
On 18.07.2007 13:19, Justin Piszcz wrote:
For the HW RAID tests (2) at the bottom of the e-mail, no, I did not set
nr_requests or use the deadline scheduler.
For the SW RAID tests, I applied similar optimizations, I am probably
not at the latest firmware. The main thing I wanted to use
On Wed, 18 Jul 2007, Hannes Dorbath wrote:
On 18.07.2007 13:19, Justin Piszcz wrote:
For the HW RAID tests (2) at the bottom of the e-mail, no, I did not set
nr_requests or use the deadline scheduler.
For the SW RAID tests, I applied similar optimizations, I am probably not
at the latest
Justin Piszcz wrote (ao):
Its too bad that there are no regular 4 port SATA PCI-e controllers
out there.
Is there a disadvantage to using a SaS controller from for example
lsi.com ?
http://lsi.com/storage_home/products_home/host_bus_adapters/sas_hbas/index.html
I haven't tried them yet, but
On 18.07.2007 13:32, Justin Piszcz wrote:
Yes I agree here, but I guess my question is why is SW RAID5 so slow on
the 3ware card?
I think the controller does disable the drives write cache when exported
unconfigured. It does always disable, unless you put the drive in a unit
and explicit
Justin Piszcz ha scritto:
I recently got a chance to test SW RAID5 using 750GB disks (10) in a
RAID5 on a 3ware card, model no: 9550SXU-12
The bottom line is the controller is doing some weird caching with
writes on SW RAID5 which makes it not worth using.
Recall, with SW RAID5 using
On Wed, 18 Jul 2007, Al Boldi wrote:
Justin Piszcz wrote:
UltraDense-AS-3ware-R5-9-disks,16G,50676,89,96019,34,46379,9,60267,99,5010
98,56,248.5,0,16:10:16/64,240,3,21959,84,1109,10,286,4,22923,91,544,6
UltraDense-AS-3ware-R5-9-disks,16G,49983,88,96902,37,47951,10,59002,99,529
Justin Piszcz wrote (ao):
On Wed, 18 Jul 2007, Sander wrote:
Justin Piszcz wrote (ao):
Its too bad that there are no regular 4 port SATA PCI-e controllers
out there.
Is there a disadvantage to using a SaS controller from for example
lsi.com ?
On Wed, 18 Jul 2007, Sander wrote:
Justin Piszcz wrote (ao):
On Wed, 18 Jul 2007, Sander wrote:
Justin Piszcz wrote (ao):
Its too bad that there are no regular 4 port SATA PCI-e controllers
out there.
Is there a disadvantage to using a SaS controller from for example
lsi.com ?
On Wed Jul 18, 2007 at 01:26:11PM +0200, Hannes Dorbath wrote:
I think what you might be experiencing is that XFS can read su,sw values
from the MD device and will automatically optimize itself, while it
can't do that for the HW RAID device. It is absolutely essential to
align your file
Justin Piszcz wrote (ao):
On Wed, 18 Jul 2007, Sander wrote:
I guess they are cheap enough to try (I haven't yet):
PCIe:
http://lsi.com/storage_home/products_home/host_bus_adapters/sas_hbas/lsisas3080xr/index.html
PCI-X
On 18.07.2007 12:23, Justin Piszcz wrote:
I am sure one of your questions is, well, why use SW RAID5 on the
controller? Because SW RAID5 is usually much faster than HW RAID5, at
least in my tests:
Though that's no answer to your question, I really can't confirm that.
I'm running a 3Ware
On Wed, Jul 18, 2007 at 01:51:16PM +0100, Robin Hill wrote:
Just to pick up on this one (as I'm about to reformat my array as XFS) -
does this actually work with a hardware controller? Is there any
assurance that the XFS stripes align with the hardware RAID stripes? Or
could you just end up
On Wed, 18 Jul 2007, Hannes Dorbath wrote:
On 18.07.2007 12:23, Justin Piszcz wrote:
I am sure one of your questions is, well, why use SW RAID5 on the
controller? Because SW RAID5 is usually much faster than HW RAID5, at
least in my tests:
Though that's no answer to your question, I
On Wed, 2007-07-18 at 12:26 -0400, Justin Piszcz wrote:
I will try these options during future testing and re-visit the speeds of
regular HW RAID5, thanks! I know they are part of the 3ware doc and I
need to re-bench with these.
3Ware cards should be tuned for optimal performance,
On Wed, 2007-07-18 at 13:17 +0200, Giuseppe Ghibò wrote:
Indeed not exists for PCI-e but Oden has spotted this PCI-X card
(which is around 97$), based on marvell chipset:
http://www.supermicro.com/products/accessories/addon/AoC-SAT2-MV8.cfm
Yes! There are several Broadcom and Marvell ASICs
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