Content-Based Read Cache (CBRC) is a vSphere hypervisor feature that is currently utilized exclusively with Horizon View and is called View Storage Accelerator. Local caching is best used only where the cache medium is much faster than network and storage device latencies, and where a small cache can go a long way. Reads are distributed across the replicas of an object for better load balancing. x��} xT���{3wfOf�d��I2$ �1! Large ratio of common data between similar OS images, which can be effectively de-duplicated in the local cache. In computer science, “data locality”, also known, as ”locality of reference” is the behavior of computer programs according to which a workload accesses a set of data entities or storage locations within some period of time with a predictable access pattern. Rawlinson is among the few VMware Certified Design Experts (VCDX#86) in the world and is the author of multiple books based on VMware and other technologies. When a small local cache can go a long way. vSAN makes replicas of storage objects across multiple servers for protection purposes. Here you can create an account, or login with your existing myVMware / Partner Connect ID. Visit these other VMware sites for additional resources and content. %%EOF hUmk�0�+�}E�w J i�m��CW�A�/5�ib��ݺ��s�8]�La����ۣ�s�SF�p� Like any storage system, VMware vSAN makes use of data locality. Virtual SAN hosts can access “objects” remotely, both read and write. Local read caching requires transferring hundreds of gigabytes of data and cache re-warming when virtual machines are vMotioned between hosts to keep compute resources balanced. %PDF-1.6 %���� endstream endobj 508 0 obj <>stream Their choices reflect the need to deliver superior performance, great economics as well as an extremely simple and consistent management experience for vSphere administrators. The network adds 10-100 usec toa storage device latency that is 1-2 msec range. �j[��V�EԈ��O� ��.ྫྷ#I��|��W���jy8�yڇ�}�������nJ�kh�Y��5�͊�v�8'�QO�N�Bg�%a.�۩rS���-�Qϒ����ͭ�~3���8�ݿ��o��Wn��kdB�M���6+Y�*���1�d��&�7Wތ����-�����K�-���y�-v�3�z�ۺ;h�L�L�s��]y>�O��p%��7i��y���t�t����u����!&fq�;��{r�����IP���u�M���E�y'c; x��U�k�0~7��GyY�-C)�I֥k��s������!u:�e���r��F�a��tw��}���_7�S>m��$�7M>�Y��!Ζ/�q�z)��|^VyS.��S8�,��3. This has been confirmed in lab experiments: it ends up being extremely difficult to measure the additional latency solely introduced by the network. The Data locality policy does not put any limitations to backup chains. Data Locality. Now featuring vSAN 7 Update 1 recommendations. ����ޡ�`��D�����`�*p ��ub��2qw��,�C=�%��|��j��e��ޢ_d�uT#��E������_��Fj�Cj+�q[��v����ܶ��q�����u����We�-���wĘ�;�1;��1� Q��Ac�$��Q�:b� VMware vSAN Design Guide. This type of data locality requires that behind every vMotion or HA event in your environment, should be a massive flood of networking traffic that can and will significantly impact latency. However, a certain range of logical addresses of an object is always read from the same replica. https://core.vmware.com/sites/all/themes/vmware, Qlogic’s Introduction to Ethernet Latency, Operational Tutorial for VMware Workspace ONE: Moving Windows 10 to Modern Management - Overview, Operational Tutorial for VMware Workspace ONE: Moving Windows 10 to Modern Management - Summary and Additional Resources, Remove Windows 10 Custom Settings Profiles, Expert Series - Windows 10 & Modern Management. • vSAN uses an adaptive replacement algorithm to evict data from the Read Cache when it is deemed unlikely that the data will be accessed again soon, and uses the space for new data more likely to be accessed repeatedly. (Ref: Qlogic’s Introduction to Ethernet Latency). For a full experience use one of the browsers below As a real-world example, consider the recent Intel DC S3700 enterprise SSD, a device with very dependable performance characteristics. vSAN achieves this by creating an abstracted pool of storage resources that can be used easily and efficiently across the entire vSphere cluster. These deployments usually involve: These types of use cases can benefit by using some form of in-memory caching solution that uses de-duplication, such as VMware’s Content-Based Read Cache (CBRC).
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