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.

Tags: VMware

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