Very slow SATA and eSata peformance
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From: Yousuf Khan on 2 Sep 2009 15:13 I don't know what causes some systems to be faster than others, but it happens. I have a friend who was getting concerned about his transfer speeds between Esata hard drives, which we measured to be over 40 MB/s. I showed him that my transfer rates were only 30 MB/s or less. I don't think it's got anything to do with the size of the cache onboard the hard drive, as we both were using essentially similar sized hard drives with similar sized caches. Yousuf Khan Smarty wrote: > I have 3 PCs which each have a variety of internal SATA drives, and all > of which have external eSATA ports. The external eSATA ports were either > factory-provided (Dell) or added by me with controller cards from > Addonics and Rosewill with PCI-Express or PCI interfaces. > > Regardless of which computer and which internal or external drive I use > (and there are 14 drives in total I have tried), the nominal transfer > rates I am getting are roughly 25 to 30 Mbytes/sec. I will occasionally > see a brief transfer rate of 70-90 Mbytes/second, but this rate only > lasts for a very short time, I assume until some buffer in RAM has > either emptied or filled. > > The machines are all 32 bit Windows, both Vista and XP, in all cases > with latest patches and service packs. > > I assume that SATA speeds closer to the theoretical limit should be > achievable, but have never seen even remotely close to this type of > performance. In fact, this type of performance I experience is much more > similar to USB2 and Firewire 400. > > Is there anything I can do to speed things up? Files I read and write > are nominally long sequential transfers of roughly 6 GByte size, in all > cases to and from NTFS volumes / partitions. > > Thanks in advance for any advice.
From: Ato_Zee on 2 Sep 2009 18:59 On 2-Sep-2009, Yousuf Khan <bbbl67(a)yahoo.com> wrote: > I don't think it's got anything to do with the size of the cache onboard > the hard drive, as we both were using essentially similar sized hard > drives with similar sized caches. Try increasing the pagefile, make it a fixed size, and if possible put it on a different drive.
From: Man-wai Chang to The Door (+MS=32B) on 3 Sep 2009 06:12 > Regardless of which computer and which internal or external drive I use > (and there are 14 drives in total I have tried), the nominal transfer > rates I am getting are roughly 25 to 30 Mbytes/sec. I will occasionally > see a brief transfer rate of 70-90 Mbytes/second, but this rate only > lasts for a very short time, I assume until some buffer in RAM has > either emptied or filled. > The machines are all 32 bit Windows, both Vista and XP, in all cases > with latest patches and service packs. If it's the eSATA, I would try re-connecting the plugs. -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (Ubuntu 9.04) Linux 2.6.30.5 ^ ^ 18:12:02 up 23:17 0 users load average: 1.22 1.24 1.19 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
From: Yousuf Khan on 3 Sep 2009 13:10
Ato_Zee wrote: > On 2-Sep-2009, Yousuf Khan <bbbl67(a)yahoo.com> wrote: > >> I don't think it's got anything to do with the size of the cache onboard >> the hard drive, as we both were using essentially similar sized hard >> drives with similar sized caches. > > Try increasing the pagefile, make it a fixed size, and if possible put > it on a different drive. Had already been done. Yousuf Khan |