Poor ESXi 4 NFS Datastore Performance with various NAS systems

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• Facing problems of performance with ESXi

  Dear Sir

  I am facing a problem and I couldn't find a solution for her, I have two virtual environment on the site of min and the other on the recovery site, and I use SRM between them.

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• slow writes - nfs datastore

  Greetings.

  I note that some write throughput problems I see with a based NFS datastore. Seems I'm not the only one who is seeing this, but so far have given little information in making it better.

  Try the update of ESXi V4 1 on a Poweredge T110 with 4 GB of memory, xeon X 3440 CPU and 1 250 GB sata drive.

  The NFS is based datastore served a machine of OpenSUSE 11.2 on a network of 1000Mb and speed and duplex has been verified to be correctly set on both machines.

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  Once, I found 3 MB/s writing was everything that I have the NFS datastore using jj. I tried both leave within the virtual machine and also in the ESXi console to the same store location.

  Performance of network using iperf, shows ~940mb/s between the virtual machine and the NFS server so when drives are out of the way, the net is doing well.

  I ended up changing the following advanced settings to see if it is any kind of problem memory buffer;

  NFS.maxvolumes to 32

  NET.tcpheapsize to 32

  NET.tcpheapmax to 128

  Which seem to help, access write from the virtual machine to the NFS data store went from 3 MB/s to 11 MB/s - 13 MB/s. So, there is certainly some slowdowns self-imposed via the default settings are defined.

  Tried to mount the NFS datastore even directory directly as / mnt in the virtual machine hosted and low and write to/mnt watch throughput ~ 25 Mbps. do the same exact command to another linux only box on the same network that I see about the same rate with the stand-alone server see about 2 MB/s more so no problem there.

  I suspect that there may be other elements in which the ESXi NFS based datastore is 50% less efficient than straight NFS. Have other any golden treats to try to obtain the ESXi storage NFS write speed up to something similar to what can be done with native NFS mounted in the virtual machine?

  TIA

  Check the mounting options on underlying partition, for example by the file system,

  -ext3 - rw, async, noatime

  -xfs - rw, noatime, nodiratime, logbufs = 8

  -reiserfs - rw, noatime, data = writeback

  Then export options use (rw, no_root_squash, async, no_subtree_check)

  Check that the IO Scheduler is correctly selected based on underlying hardware (use a rewrite if material noop).

  Increase the NFS threads (if 128) and Windows TCP to 256K.

  Finally ensure comments partitions are 4K aligned (this should not affect sequential performance well).

  I worked on a few notes on NFS, which cover all of this (not complete yet): http://blog.peacon.co.uk/wiki/Creating_an_NFS_Server_on_Debian

  HTH

  http://blog.peacon.co.UK

  Please give points for any helpful answer.

• Windows do not install ISO in the NFS datastore

  Hi all

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  The next thing I did:

  4 network cards removed from the BIOS (by changing configuration).

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  Few details on the NFS datastore:

  1. 1 TB external USB with 2 Configuration of partitions ext4 as an NFS share to the RHEL6 server on the same machine.

  2. NFS configured correctly because I can install from an iso RHEL6 very well.

  Am I missing something? Nothing wrong with iso of Windows. I used it elsewhere. Also tried a different iso Windows without success. Help, please. Thanks in advance for your time.

  Kind regards.

  As the ISO for the operating system files are big and sometimes take a considerable amount of clusters on the hard drive make a control office (or a scan of the drive) can fix corrupt ISO file. and to make sure that your ISO is not corrupted try to open it with Winrar and extract a file from it.

  Yours,
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• NFS datastore = > no host not connected, impossible to remove

  Hello

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  When I try "Datastore Mounte to... additional host", the Wizard run in an endless loop and does not load the list of hosts.

  On my hosts, the NFS share is not visible. So nothing stuck because of a file in use.

  Have you already encountered this problem?

  Sorry found the culpit... instant on the virtual machines (with mapped CD-ROM).

• ISCSI performance with HP DL160 G6 and ESX 4.0

  I feel iSCSI performance with HP DL160 G6 and ESX 4.0 servers and would like to help with this.

  I have Setup iSCSI on 3 * ESX 4.0 host.

  Each have a corresponding single target and a single LUN on the SAN. The LUNS are formatted as fmfs3 types.

  Each host is connected to the QNAP San in the same way via a Gigabit switch.

  All NICs operate at 1 GB.

  To test the performance I use vmkfstools to clone a drive from the local store to the LUN

  On the first host (a DL140 G3) performance is good to 48 MB/s.

  On the 2 DL160 performance is very poor and barely reach 2 Mbps

  During cloning, DL160 servers save also on several occasions by the following in/var/log/wmkwarning:
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  I made sure the servers are up-to-date:
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  2 * NIC HP NC362i GB (firmware 1.7.2, driver 1.3.19.12.1)
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  The SAN server configuration:
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  I looked everywhere for an answer.
  I also tried the "esxcfg-advcfg - s 1/VMFS3/FailVolumeOpenIfAPD" as suggested on some positions.
  All to nothing does not.

  Any help / advice would be appreciated!

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• ESXi v4 HP ML370G6 Performance issue - Nehalem has HT, cores to run 16 or 8 cores?

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  I'm after what has worked well for other clients on the G5 and just double the virtual processors more. It remains to ask me if I win something using DO NOT HT. 24Gb of RAM, P410i/512 MB BBWC, 5x146Gb 10K DP ENT disks:

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  Any input welcome before going live this weekend.

  GregBradley wrote:

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• HP BL460c slow performance with Mez Qlogic FC.

  I am under 16 blades ESXi with Qlogic FC mezzanine cards.  Performance have been greate to the Build number:

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  you use virtual connect and if so what version do you use?

• Moving to VM - NFS Datastore - no vmotion - invalid

  Hey people,

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  If the virtual machine is hosted by esx1 on this NFS data store.  I stop the virtual machine and remove it from the inventory.  Then, I go to esx2 and browse the data store.  Find the vmx file and add to the inventory.  Then, the virtual machine appears in the inventory, but is grayed out with (invalid) beside him.

  I'm sure I could add a new virtual machine and use the existing vmdk files like discs, but I would rather simply add to the inventory with the existing configuration.

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  Thank you very much

  Grant

  -

  ---

  Without vmotion you should always be able to migrate cold the VM - Power Down the VM - right click on the virtual machine name, select migrates - select another ESX host - you can change the storage or leave it where it is at.

  This will allow to get cold migrate the virtual computer with the ing to remove and re add to the inventory of VC.

  If you find this or any other answer useful please consider awarding points marking the answer correct or useful

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  Hello

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  Kind regards

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