VMFS block size during installation?

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• SAN LUNS vs. VMFS Block Size block size

  Hi all

  I searched a bit and you read some documents on VMFS block sizes and alignment. However, I'm still a little confused. I think I get the concept of aligning vmfs partitions and how the block size affects max vmdk/size of the file on a partition. When creating new virtual disks and LUNS on my SAN, however, I can choose the sizes of different block there, as well.

  Choose size of block even when you create a SAN LUNS as VMFS partition that will reside on this subject? There is also 'the band height' and I wonder how it might affect things. The default value is 64 k, which I was using.

  Thank you very much

  Take a look at: disk partition alignment

  Block is not to same size, cause VMFS use big block (not available at the level of storage).

  André

• I want to put my blocker exceptions during installation. How this is done?

  I need to deploy FireFox 10.0.2 in my environment. An important requirement is to have exceptions Blocker is set during installation. I know that these settings are stored in the file permissions.sqlite. Is it possible to configure this file with my settings, it is installed with my settings.

  If you need to initialize specific files in a new profile, and then create a folder of model in the Firefox program folder (C:\Program Files\Mozilla Firefox\defaults\profile\) and place the files in this folder.

• Pointer of RDM / vmfs block size?

  We run ESX 4.0 on Dell R710s connect to a network SAN IBM N-Series on CF.

  This week we had a major outage due to a server RedHat MySQL fall.

  Off firstly the server wouldn't boot past virtual POST-sachant a RDM disk I have it deleted from the configuration. The server would then boot to OS, but every time that the ROW was reconnected it would either fall or unbootable.

  I remembered we had farily recently expanded space on this server and the RDM was now 300 GB in size. However the space used was only 85% on the lun (255GB). Then I remembered the limits of block size. The server was sitting on a partition vmfs with a block size of 1 MB (256GB max). So I removed the RDM and svMotion had the server in a data store that have a block size of 2MB, reconnected the RDM and the server starts very well. After a consistency check DB we were back running.

  This survey of fault, I went to read the document of maximum rates of the white paper

  http://www.VMware.com/PDF/vSphere4/R40/vsp_40_config_max.PDF

  to be honest - had some vague information on RDM

  and then I found VMware KB

  http://KB.VMware.com/selfservice/microsites/search.do?language=en_US & cmd = displayKC & externalId = 1029697

  surprising to me, which clearly states the pointer RDM files are affected by the block vmfs sizes.

  However, there is a difference of opinion in this thread

  http://communities.VMware.com/message/1507498

  And look further in my own environment, we have several production server running with connected RDM which are excessive in size until the limits of said block size.

  I need clarity defined on it because as he sits down we could have several production machines in an unstable state, or I'm just left with no explanation for the disc lock, we witnessed and a power outage that caused a substantial loss of business.

  concerning
  wolfsonmicro

  Post edited by: wolfsonmicro Click accidental - it is always a request without response

  My understanding is that the LUN cannot be greater than the maximum size supported by the data store on that of RDM file pointer is created.  Pointer RDM file does not need to be stored on the same data store, Setup or other files vmdk files, for example you could have moved the file pointer RDM from a store of data with a larger block and left the vmx file and the data store other files vmdk with a block of 1 MB.

  Are you sure that files of pointer RDM for running virtual machines, you have on data with blocksizes warehouses NOT supporting the LUN size they point?

• VMFS block sizes - that affect files in the disks?

  Hi all

  I know that if we choose a larger block size, we can have a greater total disk (up to 2 TB I think). I also know that if I choose a larger block size, say 8 mb, so that even small files on my vmfs will lead up to 8 MB of disk space. My question is what about small files in vm disks as a windows ntfs running vm. Files on this comments will take the size of large blocks of 8 MB regarless of their size?

  8 mb, so let's say even small files on my vmfs will lead up to 8 MB of disk space

  No, it is a layer of void which takes into account more small files, LESS of pre determined threshold (I don't remember exactly what it is) are not part of this minimum block size.  For small files are 1/64 of the block size.  With the size of block 8 Meg they are 1/256 of the size of the block size.

  So I had the same problem to investigate files newspapers and others, and the VMFS takes into account so you don't waste space.

• storage on the block sizes and vmfs5 issue

  We just bought a new table with a feature called FlashDisk SSD read caching.

  the implementation of suppliers of this technology is the following: it basically puts cached applications frequently read blocks that are 16 KB or smaller in dedicated controller SSD, up to 1.6 TB per controller.

  We worry about what we paid extra money for SSD read cache and I was wondering if it will ever come into play because VMFS5 file system uses the block size of 1 MB.

  WE have Oracle DB currently set to use 8 k block size.  Now if VMFS collects the Oracle 8 KB please and puts them in blocks of 1 MB, then Im I right to believe that the read SSD cache pool will never be used?  y at - it a way to allow the Oracle 8 KB blocks to get to take advantage of the SSD cache using file vmfs5 reading system?  or is the necessary RDM here?

  Thank you!

  Now if VMFS collects the Oracle 8 KB please and puts them in blocks of 1 MB, then Im I right to believe that the read SSD cache pool will never be used?

  No, your assumption is incorrect. The size of the block VMFS is only for the sake of allocation/address of the files on the will. The size of the block VMFS has no influence IO issued by the virtual machines.

  This means that a request for/o 8 k of a VM will arrive as an application of e/s of the same 8 KB on the backend storage.

  The VMFS block size is completely independent and transparent to both, the back-end storage device and the behavior of the computers own IO virtual.

• Invalid block size Stored - Oracle 12 c DB in OEL6 installation error

  Hi guys,.

  I got the below error message when installing on DB Oracle 12 c in OEL6.

  "Block size stored invalid." And the installation completes.

  All the pre - req got passed and now I got sucked at this stage.

  Can someone help me on this please...

  Thank you

  Sunil

  Hi guys,.

  Solved the problem, I made the cksum files downloaded and it is not equal to the cksum mentioned in the oracle download site.

  I have re downloaded and Setup is complete.

  Thank you

  Sunil

• Block size of a VMFS data store limitations

  I installed my ESXi 5 server with the default block size

  For the moment, I'm trying to convert the Windows Server 2008 and I have the alert message is: "*.vmdk file is larger than the maximum size.
  supported by the data store.

  It is possible to change the size of the block after the installation of ESXI5?

  Please can you help me because I have converter many server and it is not possible to re install my ESXi server.

  Help, please.

  The screenshot I understand you try to make a volume based cloning and you have deselected (i) and selected a share resource (FAT).

  It is possible to deselect the share (in BOLD) resource and give it a try

  Is - this possibe on a disk based cloning an audit?

  Just to be safe, you have enough space on your data store to perform this conversion, and what version of Converter do you use?

• Question of size for VMFS block

  I created a 600 GB LUN. Then I go to the ESX host that contains the data - tab Configuration - Storage store - select the data store.

  Why does say that my 600GB LUN is a block size of 8? When I create a 600 GB LUN, should not be a block size of 4?

  He said that my VMFS filesystem is 3.46.

  I'm under vCenter 5.0 with ESXi 4.1

  Thank you

  I created the data store via my interface EMC e 3100

  I ' don't know this interface, but this could create the data store with a block size of 8MB. In any case, there is basically nothing wrong with the block size of 8MB. You don't have a degradation in performance compared to a different block size.

  André

• 1.8 to VMFS watch block size of 1 MB - WTF?

  We have a box 4.0 on which we have created multiple VMFS, each about 1.8 TB volumes.

  All three volumes appear and we have been using them, but today we came to increase the size of a VMDK and found that he maxed out at 256 GB.

  By looking at the properties of VMFS volume, all three show that 1.8 to, or one of them (one is this VMDK) shows a block size of 1 MB.

  By definition, if I understand correctly, you cannot have a 1.8 to VMFS with block size of 1 MB, so what is the best way to combat this?

  The server is a stand-alone, so it is not shared storage, nor is the server connected to a vCenter server.

  Thanks in advance.

  Block size does not affect the size of VMFS, it only affects the maximum size of the single VMDK file. So, it is perfectly valid to have datastore VMFS 1.8 to with 1 MB block.

  You must evacuate all virtual machines that store of data and reformat the drive with the largest block, I'm sorry, but it's your only option.

  Tomi

  http://v-reality.info

• A procedure to follow to change the block of VMFS Volume size?

  We use a VMFS volume with size of 1 MB blocks.  As the virtual HD size must be greater than 256 GB, to change the size of the block to 2 MB.

  We would like to confirm that the following is correct:

  (1) to migrate all VM this VMFS volume

  (2) delete this VMFS of ESX Cluster

  Add 3) as storage again

  4) format with the 2 MB block size

  Is it Miss?

  Thank you

  There is not another possible procedure

  But as already shown reflect the selection of block size.

  ---

  MCSA, MCTS, VCP, VMware vExpert 2009

  http://blog.vadmin.ru

• WU is blocked during installation of updates - but does not freeze

  Hello

  I recently installed Windows 7 Professional on my new PC. It worked well; After that, I installed mainboard and video drivers and then some games.

  Then I noticed that I was not activated Windows Update during installation, so I started the update manually. Download worked, but the installer is stuck to the update 10/59. I then tried to cancel the update (the "Cancel" button was clickable, then the program do not freeze) but nothing happened. So I rebooted the computer...

  I tried to update again, but WU is now stuck at 8/59. I don't know what to do; There is no error message or anything. The only way to cancel the update is by restarting the PC.

  FYI: I waited like 2 or 3 hours, but WU did not progress.

  Thank you very much for the help!

  derKeeper

  Please go here, download and Save the Fixit on this page. Ignore the advanced system like the Fixit applies to Windows 7
  How to reset the Windows Update components

  Next, configure the boot system to eliminate interference of software 3rd party-
  How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

  NOTE:  Start-up mode minimum state all the 3rd party firewalls will be disabled. Make sure that the native firewall of Windows 7 is now on by clicking on the start ORB in the field type search programs and files in the firewall .
  Under Control Panel , click on the link to check the status of the firewall .
  Alternatively, simply unplug the system from the internet at the moment.

  Run MicrosoftFixit50202.msi and wait until it has finished running, then Cancel the Clean boot steps and restart the system.
  If you are disconnected from the internet, reconnect the system now.

  When the updates that have not installed are available again, suggests that install you them in groups not exceeding 10. Yes, it will take longer than installing them at the same time, but if a problem is caused by the updates you can identify that one is causing it by uninstalling the one at a time.

  Expert MowGreen Windows IT Pro - consumer safety

• Block size is too small - reformat the data store or create files VMDk 2?

  Hello

  I'm new to VMware and so far I absolutely love everything about her!  Well, I was not too happy when I realized that I can't create more than 256 GB a drive without reformatting the VMFS datastore.   Apparently, I accepted the block size of 1 MB by default during the installation...   I now need to configure a file server with about 500 GB of storage.  The data store with a larger block size (4 MB would be fine for me) reformatting is easy enough?  I am currently working on the first host ESXi 4.1 and will move to set up 2 more hosts in the coming weeks.  I read somewhere on the forum that ESXi 4.0 doesn't let you change the block size by default of 1 MB - is this true or relevant to 4.1?

  Currently, I have only 2 small VMs on that host, and these can be easily saved and put offline for a few hours, if necessary.  When starting the server, I created a single RAID array that holds ESXi and all virtual machines - does that mean that I have to reinstall ESXi in order to increase the size of the block?

  An alternative that I can get to is to simply create 2 255 GB VMDK each and load distribution of storage in the guest operating system (Win 2008).   Performance wise, is a disc more great and better (or worse) than the two smaller disks?

  On a related note, what should I choose for the "Independent" option when you add a new virtual disk?  Default is disabled (not independent).

  Your thoughts, focus and expertise are welcome and will be greatly appreciated!

  Thanks in advance,

  Dothan

  Dothan,

  You should power (after the virtual machine backup) remove the current data store and create a new one with the new block size. I did not have this on ESXi 4.1 again, however, he worked on ESXi 4.0.

  The maximum size of VMDK. If you want ot be able to take pictures, make sure you subtract twice the size of block in GB of the documented maximum size.

  Block size 1 MB--> 254 GB (= 256 GB, 2 GB)

  Block size of 2 MB--> 508 GB (= 512 GB - 4 GB)

  Size of block 4 MB--> GB 1 016 (= 1 024 GB - 8 GB)

  Block size of 8 MB--> GB 2 032 (= 2 048 GB to 16 GB)

  André

  EDIT: Just the KB for the maximum sizes. http://KB.VMware.com/kb/1012384

• Localstorage ESX 4 block size install?

  During installation there seems to be no way to change the size of the local block on the VMFS created? Is there one another ay then a scripted installation to change that?

  ~ Ernie

  VCP3, VCP4, MCSE, CCA

  Hello

  If you want to change the block size on another partition of the COS is on, you can follow my blogppost: http://www.gabesvirtualworld.com/?p=728 change the local VMFS blocksize.

  I'll add some more info later today, including the news of Patrick.

  Gabrié

  http://www.GabesVirtualWorld.com

• How to shrink thin comments on VMFS5? or change the block size?

  Hi all, I'll try to find a way to reduce invited bloating thin-set in service in an environment VMFS5 all.

  We went from 4.1 to 5.1 and then also vmotioned storage all our newly created vm VMFS5 volumes before you delete the old VMFS3 volumes.  During this operation, everyone has forgotten that one of our volumes has been intentionally assigned to a block size of differnet than all the others for the purpose of narrowing of the guests who had swelled upward for some reason any.  Now, we have no way to create something other than a volume of 1 MB block size which prevents us from doing the cleaning routine.  Is there an alternative way to shrink a guest who does not put offline?

  For those who do not know the procedure that I describe, here's how it works:

  You have a 100 GB comments that has only 10 GB of actual data in it, but because of something after bad temporary files, cleaning up old data, etc., that 100 GB had been used at a point of real files but is now only 10 GB in use. You want to recover which is now 90 concerts waste of space because your thin provisioned VMDK is sitting there at 100 GB in size.  With VMFS3, you could create a volume with a block size that was different from that of the volume on which the guest is currently living.   In our environment were all our 1 MB LUN but one that we kept to 2 MB just for that purpose.   When we were getting a little low on space and found guests such as the one in question, we would run a simple command to write zeros to the entire free space:

  Cat/dev/zero > bigfile; RM f bigfile

  Then all you have to do is storage vMotion the guest at the volume of 2 MB and return to its normal domestic and suddenly the VMDK's 100 GB up to 10 GB, all with no impact on the guest.  Without support for the creation of a file system with a different block size in VMFS5, now I'm not aware of a way to reclaim this space in a way that does not require an interruption of the guest.

  You can select the VMFS version when you create a new data store. With selected VMFS3, you will be able to specify the desired size of the block.

  André