SVMotion migration between the block sizes

Similar Questions

• The current block size for a store of data in VMFS3 is 4 MB. Must upgrade thedatastore to VMFS5 and wants to change the block size of 1 MB

  The current block size for a store of data in VMFS3 is 4 MB. Must upgrade thedatastore to VMFS5 and wants to change the block size of 1 MB

  help me on this

  Create a new data store VMFS5 with a block size of 1 MB. Migrate all virtual machines store data to the new data store, and then delete the VMFS3 data store.

• Change the block size of 1 MB (4 MB or 8 MB)

  Hi all

  I'm in a delemia.  I have an ESXi installed 4.1 vSphere but I used the block of 1 MB by default when the size isstalling ESXi.  I have turned Virtual Machines for some time on this topic and may not all simply re - install the ESXi again.  I am currently in need greater than 256 GB drives in my virtual machines.

  What I read for possible patches to change the 1 MB to 4 MB or 8 MB data store to support more than 256 GB drives is to add to the new temporary HDD on the server and create a new store of data on it with the block size of 4 or 8 MB and then migrate the virtual machines to the new larger block size datastore.  Then re - initialize the original 1 MB data store such as a 4 or 8 MB and migrate to the original data store.

  Two questions about this:

  (1) is my eventual detailed correction?  In other words, I add another, say, 8 MB block size datastore, although I have implemented the ESXi server as a 1 MB? Or will it just automatically initiaize the new temporary data store like 1 MB anything?

  (2) If this correction is possible, the passage of the VMS in a data store from 1 MB to 8 MB data store will have reprecussions?  In other words, move a Virtual Machine with the 1 MB block size to a data store with 8 MB is a problem with this virtual machine?

  Any suggestion would be great.

  Thanks in advance.

  -Dan

  Welcome to the community,

  You can format each data store (which is just a partition with a type of VMFS partition) with a different block size and move the VM back if you wish. However, if your hardware supports ESXi 5.x, this can be an easier way to solve the dilemma, because after the upgrade to ESXi 5.x, you can also upgrade the VMFS3 data store to VMFS5 which supports the file (virtual disk) sizes of up to ~ 2 TB with a unified 1 MB block size.

  André

• 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.

• Change the block size? vSphere ESXi 4.1.0.

  Hello world

  I wanted to create a third virtual machine, but the existing computer hard drive was large (GB 266), because I had created a VMFS with 1 M block :-(

  I searched a lot of log and manuals, but I couldn t find an answer, how to change the block size of the data to 2 M store.

  I m using vSphere ESXi 4.1.0.

  Then I tried to export the VM´s to set up the new host of VM with another block. But I m not able to find a filebrowser in the vSphere Client.

  How to export or save a virtual machine or a snapshot.

  In the FAQ, it is described to "Open the filebrowser", but where it is hidden?

  Thank you very much for your help.

  Greetings from Hamburg, Ralf

  Right-click on the data store, and select Browse.

• restore the block size of buffer on ASM journal

  I know that redo logs are not written using oracle block size but with OS block size.
  
  When we put our recovery logs in ASM what is the block size used for redo?
  
  Thanks in advance

  Please see below link

  http://www.DBA-Oracle.com/t_redo_logs_multiple_disk_blocksize.htm

  I hope this should help,

  Concerning
  http://www.oracleracexpert.com
  Compatibility matrix and Oracle version support
  http://www.oracleracexpert.com/2012/05/Oracle-version-compatibility-and.html
  ORA-01427: einreihig subquery returns multiple rows
  http://www.oracleracexpert.com/2012/05/ora-01427-single-row-subquery-returns.html

• dependent on the block size of oracle on the block o/s size

  Dear all,
  
  
  What is dependent on the block size of oracle on the size of block o/s?
  
  Concerning

  Oracle data block is the smallest logical unit to store oracle data and that's usually multiple o/s block size.

• confusion about the block size

  Hello
  I doubt very simple but fundamental, I really want to know what exactly is the block size, now my confusion is to say we have 100 members in account dimension (all are store) which is dense, and we have dimension period with 18 members, who is also dense.now on 100 members account only 50 of them have values stored in them so that the size of the block will be 50 * 18 * 8 , or will it be 18 * 100 * 8
  
  Thanks in advance

  The size of the block is constant, regardless of the data.

  The density of this block varies with the data.

  The storage needs of the blocks on the changes to disk with the density of the block.

  Kind regards

  Cameron Lackpour

• Storage vmotion, between data warehouses when the block size is different

  Hi all

  I would like to know, is it possible to do a vmotion of storage between two data warehouses, when they have different block sizes. The case is as a former vmfs data store 3 which has been upgraded direct to vmfs5 there, but since it has been updated it maintains its own block size. While the newly created vmfs datastore 5 a block size of 1 MB.

  Thus, storage Vmotion will work in this case? It will fail OR will be with degraded performance?

  Finally, storage vmotion is possible even if you do not have a cluster DRS for storage?

  Thank you

  Yes you can!

  Check some info on the effects of block size: http://www.yellow-bricks.com/2011/02/18/blocksize-impact/

• Why the block size is multiple of 2?

  Hi all
  
  Sorry if I am at the base, I question why the Oracle block size is a multiple of 2?
  
  Rgds,
  Lherault

  Oracle is a software written to run on binary computers. Everything is built in the end between the lines, Word and double word boundries.

  Early block IO sizes have been built on the collections of sectors of 512 bytes then you end up with 1024, 2048, 4096, 8192 blocks IO sizes. Corresponding to the Oracle block size to the size of the OS IO seems logical.

  It has been possible to set Oracle block size to be 5K and 10K. I do not recommend it, but I've seen on older versions of Oracle. I don't know if technically you can always do.

  HTH - Mark D Powell.

• 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

• Increase the capacity of data store, which with the block size?

  Hello

  I am trying to expand my datastore 2 TB, I added a new lun 2 TB of the FC SAN TB 4 even and there is no problem adding this in the existing data store.

  But the existing data store is formatted in VMFS3 with a block size of 4 MB for a maximum file size of 512 GB. But when I try to extend the data store to select the size of the block is set to 1 MB and disabled.
  The measure automatically takes on the size of the original block or wil he get a block size of 1 MB? There are some > 256GB files on the existing data store and I think I'd get a strange behavior, if half of the data store is 4 MB and the other half is 1 MB blocksize.

  Can anyone confirm that the blocksize wil be the same for the measure?

  I can also make a second warehouse 2 TB one manually fracture the virtual machine on 2 data warehouses. is there any advantages or disadvantages to this approach?

  Don't you worry, add an item to an existing data store certainly will not change the size of the block. In any case, if it is an option that you can use two data warehouses, I would. With two distinct data warehouses that you will not only be able to spread the load on each of these LUNS but also avoid the complexity. With ESXi 5 (VMFS-5), a single LUN can grow up to 64 ~ to without needing extensions.

  BTW, a 4MB block size allows 1 TB less than 512 bytes.

  André

• How to fill out (display) values for several blocks in which there is no relationship between the blocks (tables).

  Hello.

  Is it possible to fill in the values (execute_query) several blocks where there is absolutely no relationship between the tables in the same form?

  There is no relationship between the tables. All are separate tables with different columns. None of the names of columns match

  & also the values of the columns do not match. I created blocks for all tables. When I click on run, only the first block of values (first picture) is filled.

  other values of block did not get filled. Is it possible to fill in the values for all of the blocks where there is not relationship, or when there is no master block?

  Is there something I can do for this? It is mandatory for me to put all the blocks in a single form.

  Help me, please. Please do not respond.

  Thank you.

  Create a key-EXEQRY-trigger on the block where 'throw you' the quers. In it, put something like

  GO_BLOCK ('BLOCK1');

  EXECUTE_QUERY;

  GO_BLOCK ('BLOCK2');

  EXECUTE_QUERY;

  ...

• How to increase the block size?

  Community VMWare greetings,

  Recently, I installed ESXi 4.0 on Dell PowerEdge T300 server - within this server, I have two raid arrays - one for the operating system (which is an array of 2 GB) and one for the data (which are a picture of 741 GB).  ESXi installed without problem - when I have connected to the server using vSphere machine already had two warehouses of data (datastore1 and datastore2).

  Unfortunately, datastore1 (741GB Bay) has a block size of 1 MB.  I did some research and found that a block size of 1 MB only supports a 256 GB drive size.  I have a server of 300 GB I need to virtualize, so I would like to increase the size of this block to 2 MB or 4 MB.  How can I do this?

  I'm sorry to say, but you need to remove the data store VMFS move all the data off of him and then recreate the VMFS data with the correct block size store.

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

• change the block size to SAN LUNS?

  is it possible that I can change the size of the block on a SAN LUN (whether SATA, iSCSI or fiber) with the help of a vCenter?  If not, what is the way to do it?  Or, our administrator SAN should do?

  It is easier in vcenter - once the vmfs data store has been deleted data from the data store vmfs to remove and re-create it with the correct size of the block.

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