Search Results

Search found 10 results on 1 pages for 'gregc'.

Page 1/1 | 1 

• Strange performance issue with Dell R7610 and LSI 2208 RAID controller

  - by GregC

  Connecting controller to any of the three PCIe x16 slots yield choppy read performance around 750 MB/sec Lowly PCIe x4 slot yields steady 1.2 GB/sec read Given same files, same Windows Server 2008 R2 OS, same RAID6 24-disk Seagate ES.2 3TB array on LSI 9286-8e, same Dell R7610 Precision Workstation with A03 BIOS, same W5000 graphics card (no other cards), same settings etc. I see super-low CPU utilization in both cases. SiSoft Sandra reports x8 at 5GT/sec in x16 slot, and x4 at 5GT/sec in x4 slot, as expected. I'd like to be able to rely on the sheer speed of x16 slots. What gives? What can I try? Any ideas? Please assist Cross-posted from http://en.community.dell.com/support-forums/desktop/f/3514/t/19526990.aspx Follow-up information We did some more performance testing with reading from 8 SSDs, connected directly (without an expander chip). This means that both SAS cables were utilized. We saw nearly double performance, but it varied from run to run: {2.0, 1.8, 1.6, and 1.4 GB/sec were observed, then performance jumped back up to 2.0}. The SSD RAID0 tests were conducted in a x16 PCIe slot, all other variables kept the same. It seems to me that we were getting double the performance of HDD-based RAID6 array. Just for reference: maximum possible read burst speed over single channel of SAS 6Gb/sec is 570 MB/sec due to 8b/10b encoding and protocol limitations (SAS cable provides four such channels).

  Read the article

• LSI RAID-on-chip with RAID6 over two SAS links goes red when HDD enclosure is powered cycled; how to recover?

  - by GregC

  I have a RAID6 array managed by LSI 9286-8e card. I also have Sans Digital 24-bay NexentaSTOR JBOD enclosure with SAS extender built-in. They are connected to separate UPS devices. Normally, I'd shut down the PC, leaving RAID6 in healthy state. But today the power to JBOD enclosure was cut but PC kept running. After restarting the PC, all disks in RAID6 have lit up RED, and the only option in LSI MegaRAID manager app was to reset each disk to unassigned, thereby loosing all data on RAID6 array. Thankfully, I am only testing, but how would I recover if this were to happen in production?

  Read the article

• Wireshark (WinPCap) does not see Intel X520-DA2 10 GbE NIC teaming intermittently

  - by GregC

  I am running a team of two 10 GigE ports on Intel X520-DA2 network card. They work well in tandem and achieve the desired throughput. However, I see an intermittent issue whereby WireShark and my own application (using WinPCap) only show the underlying ports, failing to recognize the team adapter. Details: Intel 17.4 NIC drivers on Windows Server 2008 R2 with all patches. HP DL370 G6 server. RSS enabled on Intel both underlying Intel NICs. The exact error: Unable to open the adapter (rpcap://\Device\NPF_{401D5903-16E7-41DC-8484-5D96765B9692}). failed to set hardware filter to promiscuous mode

  Read the article

• Using 2-port LSI 2308-8e card to control 24 SAS HDDs

  - by GregC

  I would like to rely on a RAID-on-chip solution to control 24 SAS hard drives in a direct-attached environment. How would you approach this to get best bandwidth given that I'd like to spend less than $10,000 on the interconnect. I've read that LSI 2308 chip can easily handle 8-drive SSD RAID6 in hardware. I'd like to harness its power to control 24 SAS hard drives over an expander in an external enclosure. Currently I use an Infortrend S24S-G2240 external enclosure. It provides its own controller and expander. I'd like to use LSI 2308 controller for RAID6 somehow instead of the mystery controller in the enclosure. P.S. I tried to create SAS-expander as a tag, but my rep on this site is low.

  Read the article

• How to address a recurring low temperature error seen at every boot-up?

  - by GregC

  After updating to latest controller firmware, I started receiving the following error messages: LSI 2208 ROC: Temperature sensor below error threshold on enclosure 1 Sensors 5 thru 7 Is this something I should worry about, or is it a Red Herring? Details: I have a Sans Digital NexentaSTOR 24-disk JBOD enclosure connected to LSI 9286-8e RAID-on-Chip controller with two SAS cables. Seagate ES.2 3TB SAS hard drives populate every bay in the enclosure.

  Read the article

• How to create dynamic volume in stripe configuration, aligned to 1024?

  - by GregC

  I am trying to create a software stripe setup with two physical disks (underneath they are 128K stripe, RAID5 for each). I've read that one can use diskpart, but I am unable to come up with a command that works. This is on Server 2k3 SP2. I was trying create volume stripe disk=2,3 align=1024 Diskpart errors out: The arguments you specified for this command are not valid. P.S. Tried successfully with a basic disk and a primary partition. Please reply, -Greg

  Read the article

• How to verify power provided to processors is clean

  - by GregC

  Once in a blue moon, I am seeing a blue screen of death on a shiny new Dell R7610 with a single 1100 Watt Dell-provided power supply on a beefy UPS. BCode is 101 (A clock interrupt was not received...), which some say is caused by under-volting a CPU. Naturally, I would have to contact Dell support, and their natural reaction would be to replace a motherboard, a power supply, or CPU, or a mixture of the above components. In synthetic benchmarks, system memory and CPU, as well as graphics memory and CPU perform admirably, staying up for hours and days. My questions are: Is power supply good enough for the application? Does it provide clean enough power to VRMs on the motherboard? Are VRMs good enough for dual Xeon E5-2665? Does C-states logic work correctly? Is there sufficient current provided to PCIe peripherals, such as disk controllers? P.S. Recently, I've gone through the ordeal with HP. They were nice and professional about it, but root cause was not established, and the HP machine still is less than 100%, giving me a blue screen of death once in a couple of months. Here's what quick web-searching turns up: http://www.sevenforums.com/bsod-help-support/35427-win-7-clock-interrupt-bsod-101-error.html#post356791 It appears Dell has addressed the above issue by clocking PCIe bus down to 5GT/sec in A03 BIOS. My disk controllers support PCIe 3.0, meaning that I would have to re-validate stability. Early testing shows improvements. Further testing shows significant decrease in performance on each of the x16 slots with Dell R7610 with A03 BIOS. But now it's running stable. HP machine has received a microcode update in September 2013 SUM (July BIOS) that makes it stable.

  Read the article

• Uncorrectable machine check

  - by GregC

  I am experiencing rare but real unrecoverable machine checks on HP DL370 G6 dual-core Xeon server. I ran memtest86+ before, and ran CPU-intensive operations without any problems. In your opinion, does this indicate a real problem, or is it normal and expected behavior? How would you approach this problem? EDIT after some troubleshooting, it seems that these machine checks, as well as problems when showing device manager can be traced back to NC375i NICs. All is well when the NICs are not in the server. Further improvements to stability of HP Gen6 with Intel Xeon have been brought in with BIOS update in September 2013 HP Update DVD. Intel's newer microcode makes these CPUs much more stable. We haven't seen hardware-related BSODs since the update in September.

  Read the article

• Visual Studio 2010 -- how to reduce its memory footprint

  - by GregC

  I have a solution with just under 100 projects in it, a mix of C++ and C# (mostly C#). When working in VS2005, the working set of Visual Studio is considerably smaller than that of VS2010. I was wondering if there are some things that can be turned off, so I can develop in VS2010 under 32-bit OS without running out of memory.

  Read the article

• Dependency issue with MSBuild 4.0 when doing DllImport from C# into unmanaged C++ library

  - by GregC

  Explicitly setting dependency in VS2010 between unmanaged C++ project and C# project is honored in VS2010, but dependency is ignored in MSBuild 4.0. It is impossible to add a reference to unmanaged C++ project from C# project, afaik. How do i ensure correct build order if a solution contains unmanaged and managed projects?

  Read the article

1