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Caching vs. tiering: Comparing storage optimization techniques
This article is part of the Storage magazine issue of July 2017, Vol. 16, No. 5
The difference between the fastest and slowest server storage is huge. Response time for an Ethernet-connected iSCSI SAN system can be six or seven times that of RAM or 3D XPoint. What takes nanoseconds for RAM can take less than a microsecond for 3D XPoint or PCI Express nonvolatile memory express SSDs, milliseconds for SAN storage and as much as 100 milliseconds for disk-based SAN or NAS systems. From the fastest to the slowest, that's a factor of millions of times. Given that disparity, tiering or caching storage optimization techniques can make an enormous difference in an enterprise's active data performance. Deciding which to use is more complicated than simply picking one or the other, however. For instance, with tiering, new storage systems and data management methods have made it more complicated than just dividing data into hot, warm and cold tiers. And with caching, the approach -- write-around, write-through or write-back and server-side or appliance -- that's right for your systems depends on several factors, ...
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Features in this issue
The storage piece of the HCI market is complex and confusing. Know the most important features to consider as you evaluate your options.
Enterprises look for the best deal from the vendor with the best reputation when turning to the cloud to tame growing data volumes for archiving, backup and more.
Many vendors offer highly scalable object storage-based products with file interfaces, making the technology more accessible than ever as an alternative to NAS.
There are many factors to consider when choosing between caching and tiering storage techniques to optimize storage. Knowing how and when to use either can make a big difference.
Columns in this issue
Done right, data protection such as cloud-based disaster recovery is the best countermeasure organizations have against insidious ransomware attacks.
Catalogic Software's approach to snapshot creation and management delivers pragmatic features to DevOps and more with the release of ECX 2.6.
Maximizing the value of incoming and outgoing data as a core business strategy demands transforming your IT infrastructure into a more agile and flexible entity.
Object storage, unlike traditional file and block storage, is well-suited to manage vast amounts of unstructured data.