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Hehe, yeah. With the intent of being precise, I have a tendency to over-complicate my explanations. :D
Anyways, thanks to your assistance, I'm armed with the knowledge I need to make an informed decision!
Once I do ultimately pick up a Razer Nostromo, I'll be sure to report my findings to...
Thank you so much for your kind testing and explanations, Nostrovia.
I may be misunderstanding you, but the way you describe the toggle it actually sounds about right. Just like the Shift key on the keyboard one needs to hold it down to get the alternate (capitalized) version of a key. So...
Nostrovia: Indeed, very interesting! I greatly appreciate your assistance. If you don't mind, I'd like to clarify with you the kind of responsiveness I'm seeking just to see if it fits with your experience. With the n52, those momentary keymap toggles work pretty much just like the Shift key...
Thank you all for the replies!
Ponder: I had not heard about the onboard memory limitation hypothesis, although that would make sense. Unfortunately, if true, then there may be nothing that can be done by Razer to resolve this on the current product. I'm guessing I'm long tail, once again...
I've owned a few Belkin Nostromo n52s over the years, and I loved them. Unfortunately, the last one I bought is starting to fail and I need to decide how to proceed. After doing my research on my options, it seems another Nostromo is my best bet.
I require momentary keymap switching...
Can Areca cards be run in write-back mode without a BBU? While I appreciate this is not recommended, and ultimately, if I'm happy with the card, I'll likely get a BBU, I'd like to experiment/benchmark with the cards I'm considering (either a 1222 or 1880) without having to buy the BBU up front...
It appears not. NCQ is only mentioned at the adapter level in the documentation. There are rather few settings for applying to the physical disks (disk write cache is one).
So I got tired of waiting for LSI to reply to the ticket I opened, so I called them. I spoke with one TSE who said I...
It should be something so easy to look up, but I'm having a heck of a time determining that. These are nearline SAS drives so they are SATA drives with a SAS interface. But, I can find no reliable source for what my Constellation ES SAS drives have. The manual mentions a "tag queue" in two...
Very interesting. When it comes time to build the filesystems again, I'll put that information to good use!
However, I have some new data and some speculation to go with it. First the very distressing data. These are the same tests as yesterday but with write-behind disabled:
sudo dd...
Hi John. Regarding your question, all Linux tests were performed on ext4, with the exception of the Debian Lenny tests which were on ext3.
I think the results of the latest batch of your suggested tests are interesting:sudo sudo dd if=/dev/zero of=/dev/sdb bs=1M count=16000...
Hi John. It looks like your suspicion was correct regarding direct I/O and reads. Here are the results of your suggested test:
sudo dd if=/dev/zero of=/media/testdrive/testfile bs=1M count=96000
sudo sync; sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
sudo dd if=/media/testdrive/testfile...
I compiled and installed the 2.6.39.2 kernel for my Natty test system. The results show the same strange and distressing benchmarking patterns.
Linux 2.6.39.2 #2 SMP Sun Jun 26 02:29:41 EDT 2011
filename: /lib/modules/2.6.39.2/kernel/drivers/scsi/megaraid/megaraid_sas.ko
description...
Ah! That'll be easier then. I'll throw the latest Archlinux on a partition and run the tests again. I'll report back with the results. Thanks again.
Edit: Or, probably even easier, I'll upgrade the Natty environment to 2.6.39.
Thanks again for your continued and gracious assistance.
I've now set up 3 Linux environments (outside of ESXi so direct to the RAID controller) for testing this problem. All three are currently using the default drivers from the distributions. Below is the information you requested on each...