Topic
  • 5 replies
  • Latest Post - ‏2013-06-25T15:35:02Z by esdata
SystemAdmin
SystemAdmin
9111 Posts

Pinned topic x3650 M3 - strange behavior with storage perfromance.

‏2012-04-12T07:07:43Z |
Hi all,

I want to ask you a advice or what to do with the following case.
We have a couple of IBM x3650 M3 with these specs:
  • x3650 M3, 2 x Xeon 6C X5675 95W 3.06GHz/1333MHz/12MB,
  • ServeRAID M5015;
  • 8GB (1x8GB, 2Rx4, 1.5V) PC3-10600 CL9 ECC DDR3 1333MHz LP RDIMM;
  • 2 x Express IBM 146 GB 2.5in SFF Slim-HS 15K 6Gbps SAS HDD;
  • 2 x IBM 6Gb SAS HBA;
  • Intel Ethernet Dual Port Server Adapter I340-T2 for IBM System x;
  • IBM 675W High Efficiency Redundant AC Power Supply;
  • IBM Virtual Media Key.

OS was installed on local RAID 1, which was created with the ServeRAID M5015 and 2 x Express IBM 146 GB HDDs.

The problem. We have a reduced throughput with the local disks on the servers, and disks on DS3512 connected to these servers with IBM 6Gb SAS HBAs.

In brief – tests (IOMeter, HD_Speed) have shown out that the throughput is equal ~ 3 Gbit/seconds, when we were testing both local disks, and disks on DS3512 connected to these servers.
Physically all equipment (disks, local RAID-controlers, DS3512) corresponds to the SAS 2.0 standard, or 6 Gbit/seconds. Theoretically I should receive something about 5 Gbit/seconds, but all what I have ~ 3 Gbit/seconds.

This speed I receive on different operating systems – Windows Server 2008 R2 SP1 and VMware ESXi 5 UP1 (I've been testing a virtual machine under its management), so it is obvious that something wrong with the servers.

All settings in BIOS were configured for the maximum performance, C-states are disabled. In the system logs both on servers and DS3512 everything is ok, the established speed of all interfaces - 6 Gbit/seconds. Where is the problem is unclear...

I've opened a case with the IBM's technical support, and sent them all logs that they have required, but as they told me - it is your problem that you cannot achieve
speed 5 Gbit/seconds when testing your disks.

Very funny, I have a 3-years old server with the SAS 1.0 disks and RAID controller and I get ~ 2,2 Gbit/seconds in comparing with 3 Gbit/seconds on the newest x3650 M3 server...

Please, help to resolve this issue :(
Updated on 2012-04-12T07:12:48Z at 2012-04-12T07:12:48Z by SystemAdmin
  • SystemAdmin
    SystemAdmin
    9111 Posts

    Re: x3650 M3 - strange behavior with storage perfromance.

    ‏2012-04-12T07:12:48Z  
    Small update. All servers have 128 Gb RAM.
  • esdata
    esdata
    2 Posts

    Re: x3650 M3 - strange behavior with storage perfromance.

    ‏2013-06-12T15:00:45Z  
    Small update. All servers have 128 Gb RAM.

    Hello,

    Our X3650 M3 with a M5015 and a M5025 controller slows down when the disk go in "write trough state". This happens when the battery of the raid controller is recalibrating.

    We switched the auto recalibrating off and do it manually.

     

    RV

  • Novikov_Alexander
    Novikov_Alexander
    6865 Posts

    Re: x3650 M3 - strange behavior with storage perfromance.

    ‏2013-06-12T18:42:33Z  
    • esdata
    • ‏2013-06-12T15:00:45Z

    Hello,

    Our X3650 M3 with a M5015 and a M5025 controller slows down when the disk go in "write trough state". This happens when the battery of the raid controller is recalibrating.

    We switched the auto recalibrating off and do it manually.

     

    RV

    Dear  Richard,
     

    read the next doc about "write trough state" and recalibrating:

    ServeRAID-M Series Battery Backup Unit (BBU) charge cycle behavior and cache modes - IBM System x
    https://www-947.ibm.com/support/entry/myportal/docdisplay?lndocid=MIGR-5078572

    BTW, there is another useful info about few new modes  :

    Battery mode changes for IBBU08 - IBM System x
    https://www-947.ibm.com/support/entry/myportal/docdisplay?lndocid=MIGR-5089843

    Regards,
    Alexander Novikov
    Russia, Moscow

  • jcwWork
    jcwWork
    1 Post

    Re: x3650 M3 - strange behavior with storage perfromance.

    ‏2013-06-25T14:30:44Z  
    • esdata
    • ‏2013-06-12T15:00:45Z

    Hello,

    Our X3650 M3 with a M5015 and a M5025 controller slows down when the disk go in "write trough state". This happens when the battery of the raid controller is recalibrating.

    We switched the auto recalibrating off and do it manually.

     

    RV

    How do you switch the "Auto re-calibrating off" and how do you do it manually?

    Thanks

     

     

  • esdata
    esdata
    2 Posts

    Re: x3650 M3 - strange behavior with storage perfromance.

    ‏2013-06-25T15:35:02Z  
    • jcwWork
    • ‏2013-06-25T14:30:44Z

    How do you switch the "Auto re-calibrating off" and how do you do it manually?

    Thanks

     

     

    Hello James,

    You can use the MegaRaid Storage Manager to switch the auto recalibrating off and to start a cycle manually.

    However, when you have a new battery pack for the M5015/M5025 you better read the link for the IBBU08 provided by Alexander Novikov.

    Regards,

    Richard.