Difference between HNAS Tiering from HDT?
HNAS Tiering is known as HNAS Tiered File System. Thisis done at the storage pool level. There are two tiers setup, one for metadata (T0) and another for data (T1).
HNAS can also perform file level tiering using HNAS Data Migrator. With Data Migrator, individual files can be moved to secondary tier within HNAS or external to HNAS.
As was mentioned by the others, HDT is done at the storage block level. So depending on your needs you can tier on storage, file system or file level.
HDT is an optional feature available on the HUS VM and VSP for sub lun tiering of block storage volumes. HDT can move active and inactive blocks across pools of storage based on performance history. One of the main goals for HDT is improve or maintain storage performance but to use less drives to achieve it. Hosts can access this storage via SAN. This video gives a primer on HDT - Dynamic Storage Tiering Demo: The Integration of Block, File and Content Data - YouTube
The HNAS is a gateway that presents block storage over IP as NAS using CIFS or NFS. HNAS Tiering is performed by the HNAS units, and moves complete files on different storage i.e. from 600 GB - RAID 5 to 3 TB - RAID 6. With this you can use HUS, HUS VM, or VSP storage as the back-end block storage.
Hope that helped you out.
In HDT (block)
- tiering is at the block level
- data moves across the tiers (of course based on how busy it is)
- does not differentiate what is in the data (all data treated as same)
In HNAS tiering
- it basically separates metadata with actual data
- user data stays remains where is it
(unless you want to use data migration to move user data)
So in my opinion though the name tiering is used in both cases, the goals are very different.
Thanks to @Alex Theodore Michelle Ann HakFrancisco Salinas for sharing all the inputs, This will help not only me, but also others who requires the clarification.
Has anyone had actual experience in setting it up ?I would like some insight on HDT Implementation - Raised a discussion already - Storage Tiering "in reality"
Any comments would be welcome ..
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