Why the block size is multiple of 2?

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• 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,

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  http://www.oracleracexpert.com
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• 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.

• Why the Photos app saves multiple copies of pictures?

  Why the Photos app saves multiple copies of pictures?

  What system and Photos version do you use?

  Where are these pictures?  How did they enter the photo library?

  Where and how do you see these multiple copies.

  

• Why the font sizes are so limited in the E10 Editor?

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• 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.

• 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.

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• 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

• 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.

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

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  Greetings from Hamburg, Ralf

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

• 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

• Why the file size does not change when I use "Process multiple Images" to add a watermark?

  Hello

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  File size reduction is the effect of jpeg compression. In the process several files dialog, check the bottom option "convert files to the format" and choose "jpeg max quality.

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• 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/

• 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