The products are designed for environments with mid-tier network storage needs. The products support a hybrid flash setup, which combines the performance of flash-based solid-state drives SSDs with the large capacity and low cost of mechanical hard disk drives HDDs. All three products can be scaled into clusters of up to nodes. It runs dual eight-core Intel Xeon processors. The Isilon X-Series lineup supports a variety of software and management options: Isilon SmartDedupe allows deduplication of redundant data across multiple sources. SmartPools implements an automated tiering system to move frequently used data into performance-based pools.
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Since metatree transfer goes in opposite direction from linscan, the LIN table needs to be re-verified to ensure a file is not missed during the first LIN verify. This is necessary since a cloning operation during FlexProtect, for example, might have moved an un-repaired block to a shadow store. This phase scans only the SIN portion of the table. The one exception is that references from files intentionally leaked by removing a LIN table entry to a file will not be freed, so collect will deal with these.
If all blocks in a shadow store have been freed then the shadow store is removed. The ShadowStoreProtect job updates the protection level of shadow stores which are referenced by a LIN with a higher requested protection. Shadow stores that require a protection level change are added to a persistent queue PQ and consumed by this job.
All the jobs which can change the protection contain an additional phase for SINs. In the SIN phase, the highest recorded policy will be used to protect the shadow store. In the case of disk pools, shadow stores may inherit the effective protection from the disk pool but not the disk pool itself.
As we have seen, to a large degree shadow stores store data like regular files. However, blocks from regular files are moved or copied to shadow stores and the original blocks in the source file are replaced with references to the blocks in the shadow store. If any of the logical blocks in the source file are written to, a copy on write COW event is triggered, which causes a local allocation of a block for the source file to replace the shadow reference.
There may be multiple files with references to the same logical block in a shadow store. When all external references to a block in a shadow store have been released the block in the shadow store is now unused and will never be referenced again. The background garbage collection job, ShadowStoreDelete, periodically scans all the shadow stores and frees these un-referenced blocks.
Once all the blocks in a shadow store are released, the shadow store itself can then be removed. Be aware that files which reference shadow stores may also behave differently from regular files in that reading shadow-store references can be slower than reading data directly.
Specifically, reading non-cached shadow-store references is slower than reading non-cached data. Reading cached shadow-store references takes no more time than reading cached data. When files that reference shadow stores are replicated to another Isilon cluster or backed up via NDMP, the shadow stores are not transferred to the target Isilon cluster or backup device.
The files are transferred as if they contained the data that they reference from shadow stores. On the target Isilon cluster or backup device, the files consume the same amount of space as if they had not referenced shadow stores. When OneFS creates a shadow store, OneFS assigns the shadow store to a storage pool of a file that references the shadow store. If you delete the storage pool that a shadow store resides on, the shadow store is moved to a pool occupied by another file that references the shadow store.
OneFS does not delete a shadow-store block immediately after the last reference to the block is deleted. If a large number of un-referenced blocks exist on the cluster, OneFS might report a negative deduplication savings until the ShadowStoreDelete job is run.
Shadow stores are protected at least as much as the most protected file that references it. Quotas account for files that reference shadow stores as if the files contained the data referenced from shadow stores; from the perspective of a quota, shadow-store references do not exist.
However, if a quota includes data protection overhead, the quota does not account for the data protection overhead of shadow stores.
Since metatree transfer goes in opposite direction from linscan, the LIN table needs to be re-verified to ensure a file is not missed during the first LIN verify. This is necessary since a cloning operation during FlexProtect, for example, might have moved an un-repaired block to a shadow store. This phase scans only the SIN portion of the table. The one exception is that references from files intentionally leaked by removing a LIN table entry to a file will not be freed, so collect will deal with these. If all blocks in a shadow store have been freed then the shadow store is removed. The ShadowStoreProtect job updates the protection level of shadow stores which are referenced by a LIN with a higher requested protection.
EMC Isilon X-Series NAS: Isilon x200, x210 and x410
EMC Isilon X200 - NAS server - 24 TB Series Specs
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