![]() The oversubscription rate can get quite high if you use a hypervisor for your discrete servers. These will log into a core switch passing frames over to storage. This switch takes these 16 servers and performs a form of NAT, forwarding all of their traffic to a lesser number of ports commonly 4, and as many as 16 ports. Each of these servers connects to an internal HBA which connects to the embedded switch. UCS connects to an additional switch/bridge, a "Fabric Interconnect" and then to a core switch.Įach one of these steps increases oversubscription.įor example, a bladed chassis might have 16 discrete servers. All but UCS use a type of "dumb" switch (no zoning) which connects to a core fabric switch (this is true for FC and iSCSI). These systems commonly have a number of bladed servers that connect to an embedded switch over a copper bus. Many of our customers use a CPU chassis such as a Cisco UCS or a HP c7000. Create at least 8 sessions per host (or, again, use all interfaces on Pure).Verify all paths are clean address any CRCs or similar errors.Use all of the FlashArray's interfaces (critical for iSCSI performance).VLAN tagging is only supported in Purity 4.6.0+.Utilizing a closed network is recommended whenever possible. While the FlashArray encrypts data at rest, I/O sent over the wire is likely clear text, with the exception being if CHAP is in use. Introduces potential security concerns.Thus if you have a slower routed network you may not be taking full advantage of the FlashArray. One of the reasons for buying a Pure Storage FlashArray is for speed. The more hops you take the more time it takes to communicate back and forth. Introduces potential latency to your network.This is due to more components, paths and devices to review during times of unexpected behavior. Often times having a routed network results in longer troubleshooting to isolate where the problem is originating from. Introduces complexity in troubleshooting.This is especially true if jumbo frames and multiple link speeds (1GbE / 10GbE) are in use. Introduces complexity in configuration.
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