Open-E JovianDSS ver.1.0 up01 Release Notes

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Revision as of 12:21, 31 July 2014 by migrate>Da-B
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Known issues

Using Sync always, Sync standard and Sync disabled

    Sync always for Zvol is the safest option and is set by default. However, it can cause write performance decreases since all operations are written and flushed directly to the storage. In case of using sync always, it is recommended using mirrored write log.
    Sync standard option improves the write performance, but some (cached) data can be lost in case of a sudden power failure. Use this option only in environments equipped with UPS.
    Sync disabled gives the highest performance, but can be a dangerous option. Use it only when necessary and on UPS protected environment.

Browser recommendations

    It is strongly recommended to use Mozilla Firefox browser to navigate the system’s GUI. When using other browsers some slight problems with displaying content may occur.


System as a guest in virtual environments:

    Hyper-V:
    System doesn't work correctly as a Hyper-V virtual machine (guest). There are issues with hv_netvsc network driver.
 
    VMware ESXi:
    In case of installing the system as a VMware ESXi guest please use the following settings:
       - Guest OS: Other 2.6.x Linux ( 64bit )
       - Number of Cores: 4
       - Memory: Minimum 8GB
       - Network Adapter: VMXNET 3
       - SCSI Controller Type: Paravirtual or LSI Logic SAS
       - Boot Disk : 20GB Thick Provision
       - Add at least 6 virtual disk
       - Edit Settings->Options->Advanced-General->Configuration-> Add row: disk.EnableUUID : TRUE


Reclaim deleted blocks on thin-provisioned LUNs in various systems

    In case of deleting large amounts of data, reclaimed deleted blocks on thin-provisioned LUNs in Windows 2012 can significantly slow down system performance. If you predict frequent deletions of large amounts of data, we recommend turning off the automatic reclaim function in Windows 2012. This can be done by disabling the "file-delete notification" feature in the system registry. To do so, follow the steps below:
       - start Registry Editor.
       - locate the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem       
       - double-click DisableDeleteNotification.
       - in the Value data box, enter a value of 1, and then click OK.
 
    In order to reclaim the free space in Windows 2012 please change the    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem\DisableDeleteNotification key value back to 0 and use "Optimize" tool located in Disc Management->[disk]->Properties->Tools. As the operation can generate a very high load in the system, it is recommended to perform it after-hours.  
In case of VMware ESXi, the automatic reclaim feature is disabled by default. To reclaim the space of deleted blocks on thin-provisioned LUNs, please use vmkfstools. For details, please refer to the VMware Knowledge Base : http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2014849
 
    In case of using Windows 2008 or Citrix Server there is no possibility to reclaim the space released by deleted data of thin-provisioned LUNs.

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