Windows Server 2012 Storage Spaces Simple RAID 0 VERY SLOW reads, but fast writes with LSI 9207-8e SAS JBOD HBA Controller

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has else seen windows server 2012 storage spaces simple raid 0 (also happens mirrored raid 1 , parity raid 5) virtual disk exhibiting extremely slow read speed of 5mb/sec, yet write performance normal @ 650mb/sec in raid 0?

windows server 2012 standard

intel i7 cpu , motherboard

lsi 9207-8e 6gb sas jbod controller latest firmware/bios , windows driver.

(4) hitachi 4tb 6gb sata enterprise hard disk drives hus724040ale640

(4) hitachi 4tb 6gb sata desktop hard disk drives hds724040ale640

hitachi drives directly connected lsi 9207-8e using 2-meter sas sff-8088 esata cable six-inch esata/sata adapter.

the enterprise drives on lsi's compatibility list.  the desktop drives not, regardless, both drive models affected problem.

interestingly, entire configuration 2 siig esata 2-port adapters instead of lsi 9207-8e, works both reads , writes @ 670mb/sec.

i thought sas going sure bet expanding beyond capacity of port limited esata adapters, after week of frustration , spending on $5,000.00 on drives, controllers , cabling, it's time ask help!

any similar experiences or solutions?



wow, after solid week of utter frustration along sleep deprivation, have managed fix problem!!!! :-)

turns out culprit 1 thing shouldn't problem - sas cable!

lesson learned: careful of cheap, inexpensive sas cables!

yup, sff-8088 sas sata cable messing works.

after (finally) noticed multiple windows event viewer error messages disk i/o problems "the io operation @ logical block address 5e5ef0 disk 4 retried", removed drives raid 0 array , tested each disk drive individually copying 40gb file to/from separate drive directly connected 6gb motherboard sata port.

incredibly, 3 of 6 drives failed test.  a 50% failure rate on brand new drives improbable.  and, since lsi 9207-8e board has great reputation, remaining scofflaw, tragically, !@*^$#g sas cable.

fortunately, vendor of lsi certified cables (www.magentacomputer.com) able provide perfect, high-quality working sas cable.  for record, magenta computer unrelated source of bad sas cable.

thankfully, working now!  no more slow performance!!! :-)   storage spaces works great!!

-----------------------------------------------------------------------
crystaldiskmark 3.0.2 x64 (c) 2007-2012 hiyohiyo
                           crystal dew world : http://crystalmark.info/
-----------------------------------------------------------------------
* mb/s = 1,000,000 byte/s [sata/300 = 300,000,000 byte/s]

           sequential read :  1198.373 mb/s
          sequential write :  1221.939 mb/s
         random read 512kb :    75.286 mb/s
        random write 512kb :   351.124 mb/s
    random read 4kb (qd=1) :     1.156 mb/s [   282.3 iops]
   random write 4kb (qd=1) :    12.881 mb/s [  3144.8 iops]
   random read 4kb (qd=32) :    10.397 mb/s [  2538.3 iops]
  random write 4kb (qd=32) :    12.844 mb/s [  3135.7 iops]

  test : 1000 mb [d: 0.3% (83.3/29799.9 gb)] (x5)
  date : 2013/04/12 18:05:42
    os : windows server 2012 server standard edition (full installation) [6.2 build 9200] (x64)
    hitachi 4tb sata 7200 rpm (4) desktop , (4) enterprise hdd's on lsi 9207-8e sas controller thru (2) sas sff-8088 4-connectors sata cables in ws2012 storage spaces raid0.

hope detail helps others...






Windows Server  >  File Services and Storage



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