I recently have purchased a Adaptec 5805 w/BBU 512MB Cache and a dual core ROC On board processor on to a 8x pcie 2.0 slot on the Gigabyte 990fx-UD7 motherboard with 6x (2TB) seagate 7200RPM configured in a RAID level 5. i got 32GB 1866 mhz gskill sniper ram a fx 8350 8core AMD processor OC to 4.5 Ghz with water cooling 100Hi corsair and a 500Gb seagate for the OS running Windows 7. yeah yeah we all know the specs. anyways I installed it updated the firmware to the very latest pulled the latest driver from adaptec as well istalled the BBU configured the 6 drives set them up in a raid 5 (as mentioned above) and let it do its parity checks to optimize the RAID. everything boots up nicely loads correctly it shows my 9.8 TB of storage on the RAID 5 as OPTIMAL. I got two 120mm fans blowing right on the card to keep it cool and all the cache settings to enabled and the write cache to write back mode with the BBU. I have performed checks with crystaldisk and get results around 700MB/S READ and WRITE Sequentially ofcoarse.
HERE IS THE QUESTION and SUPPOSED PROBLEM:
As I transfer files from my RAID 5 to my other SATA connected HDD on my computer files ranging from 2GB to 14GB. it starts off really fast at about 96MB/s with Teracopy. all the write cache enabled for the other HDD on my system as well in windows so not only the RAID 5 with write back cache but also the drive that has the OS and USB connected drives I have put Write cache enabled on them. It starts off super high and then at about the 1GB transfer mark it slows all the way back to 30MB/s file transfer speed and continues 30MB/s through the transfer never speeding back up. it depends on what file is transfered though some it stays at 96 through the whole transfer those usually being small files like the 2GB or lower ones but anything over 2GB it always slows back down to 30 or 40 MB/s. I have heard that the Adaptec 5805 are Way fast at above 110 MB/s file transfer speed but have yet to see this speed. do you think that the write cache is filling up and therefore it slows back down? do you think it is a bottleneck in the write speeds of the drives i'm writing files to the NON RAID 5 HDD?? do you think i should be getting 100 MB/s and above on file transfers? or is that only with SAS 15000rpm drives? or do you think I need a SDD for maxiq to be able to reach those speeds? I have been doing lots and lots of research trying to figure this out but have found nothing. any of you IT pros that know Adaptec cards let me know what the problem is or if there even is a problem with going from fast to slow file transfer speeds. love you guys thanks for everything
HERE IS THE QUESTION and SUPPOSED PROBLEM:
As I transfer files from my RAID 5 to my other SATA connected HDD on my computer files ranging from 2GB to 14GB. it starts off really fast at about 96MB/s with Teracopy. all the write cache enabled for the other HDD on my system as well in windows so not only the RAID 5 with write back cache but also the drive that has the OS and USB connected drives I have put Write cache enabled on them. It starts off super high and then at about the 1GB transfer mark it slows all the way back to 30MB/s file transfer speed and continues 30MB/s through the transfer never speeding back up. it depends on what file is transfered though some it stays at 96 through the whole transfer those usually being small files like the 2GB or lower ones but anything over 2GB it always slows back down to 30 or 40 MB/s. I have heard that the Adaptec 5805 are Way fast at above 110 MB/s file transfer speed but have yet to see this speed. do you think that the write cache is filling up and therefore it slows back down? do you think it is a bottleneck in the write speeds of the drives i'm writing files to the NON RAID 5 HDD?? do you think i should be getting 100 MB/s and above on file transfers? or is that only with SAS 15000rpm drives? or do you think I need a SDD for maxiq to be able to reach those speeds? I have been doing lots and lots of research trying to figure this out but have found nothing. any of you IT pros that know Adaptec cards let me know what the problem is or if there even is a problem with going from fast to slow file transfer speeds. love you guys thanks for everything