VMware vSphere

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  • 1.  copying between virtual disks very slow

    Posted May 22, 2011 07:39 PM

    I am runing esxi 4.1 with 4 x sata 1tb drives on a dell perc5e in a raid 10 config.

    The server has 4 x intel pcie gigabit nics. Copying files over the network is fine and the drives are getting maxed out.

    However, copying between vmdk's is very slow on the same vm. The vm is a fedora 14 with 5 vmdks. Filesystem on the vm is ext4.

    Can anybody shed any light on this?



  • 2.  RE: copying between virtual disks very slow

    Posted May 22, 2011 10:43 PM

    does your raid card comes with cache? without the cache performance of such storage would be very slow ..



  • 3.  RE: copying between virtual disks very slow

    Posted May 23, 2011 03:52 AM

    yes, it's got 512mb cache on the card. i'll take a closer look at that to see if there's anything i can adjust although I haven't altered anything from the default.



  • 4.  RE: copying between virtual disks very slow

    Posted May 23, 2011 04:28 AM

    ok, how slow is slow? also just make sure the cache and the battery are in working condition (and not faulty) ..



  • 5.  RE: copying between virtual disks very slow

    Posted May 23, 2011 04:37 AM

    sorry, my mistake. I was using winscp to copy files from drive to drive and the pc with winscp was on a different vlan with the router having a 100mb interface. After using a pc on the same vlan as the files that needed copied, everything was fine. DOH!



  • 6.  RE: copying between virtual disks very slow

    Posted May 23, 2011 04:40 AM

    anyway glad that things are working out the way you wanted it .. btw how fast is fast now? =)