1 Reply Latest reply on Jul 31, 2013 1:24 PM by escovici

    RMS25CB080 on R1208gz4gcsas - slow disk access




      We have an Intel Server (as mentioned in title) with the following config:

      16 GB RAM

      1 CPU Intel Xeon E5-2630

      4 x Hitachi HUC109090CSS600 in RAID 6, with two partitions: C (300GB) and D (1.34TB)

      APC Smart-UPS 2200

      Windows Server 2012 Standard



      In Intel Raid Web Console, the setup is as follows:

      - Disk Cache Policy: Unchanged

      - Read Policy: Always Read Ahead

      - IO Policy: Direct IO

      - Write Policy: Write Back (with default policy - Always Write Back, as we did not purchase a BBU yet)


      For a week since we installed this server, everything went smoothly. Yesterday evening the Event Viewer logged the following events (in order of appearance):

      - 12 x The speed of processor 0 in group 0 is being limited by system firmware. The processor has been in this reduced performance state for 71 seconds since the last report. = 1 warning for each logical CPU

      - 3 x While transmitting or receiving data, the server encountered a network error. Occasional errors are expected, but large amounts of these indicate a possible error in your network configuration.  The error status code is contained within the returned data (formatted as Words) and may point you towards the problem. - which I assume is from a short power failure that happened around that time - we have some switches in other locations, not backed up by UPSes.


      Since then, the disk access became slower than a normal SATA disk, and all activity is just sluggish. Even launching the Event Viewer takes a lot of time. I've seen this performance before switching from Write Thru to Write Back.


      I've rarely seen the CPU going above 20% and the memory has a constant rate of 36% usage.


      Copying a 4GB iso from D to C:


      Also, two benchmarks made, one last week and one now. You can guess wich is which