The biggest drawback of the caching functionality in EMC Unity hybrid arrays is that both the SSD layer (FastCache) and memory layer (System Cache) don't cache small block random writes, so if your workload is write intensive then you might have performance issues even if you have large amounts of system RAM or Fast Cache SSDs in your EMC Unity array.
Seagate Chooses VirtuCache for its 1200 Accelerator Product Line to Increase VM Densities for VDI Deployments
Seagate’s Enterprise SSD business unit manufacturers and sells high performance enterprise grade Solid State Drives (SSDs). Seagate realized that enterprise SSDs were well suited for the fast growing Virtual Desktop Infrastructure (VDI) space. Since most VDI deployments use VMware vSphere, Seagate was interested in partnering with a software vendor that could compliment their SSDs to address storage IO issues in VMware based VDI deployments.
Global Foundries is one of the world’s largest semiconductor foundries making chips for AMD, IBM, and Qualcomm.
Global Foundries’ IT had recently moved their Business Intelligence applications from physical servers to VMs. Such a migration had resulted in high storage latencies and lower throughput for this application, which meant that the user queries during the daytime and batch jobs during off-hours were taking a lot longer than when the workload was running on bare metal Centos 6.x servers. At peak throughput of a few hundred MBps, latencies were in hundreds of milliseconds, which in turn caused the application to malfunction. As a result, they wanted to ensure that VM level latencies at sustained 100MBps throughput was less than 15 ms and, and even at peak throughput of 400MBps, latencies would not exceed 30 ms.Global Foundries IT Infrastructure
- Physical Servers - Global Foundries had six HP BL460c G7 blades with 144GB RAM running non-virtualized Centos 6.x that ran their Business Intelligence applications on Oracle 11G.
- For improved manageability, and specifically to leverage VMware features like DRS, High Availability and Load Balancing, they wanted to deploy this application within VMs in VMware 5.1.
- Storage - A total of 36 TB of storage on LUNs was provisioned across a 8 gbps Fiber Channel Clariion CX4 appliance and another 10gbps FCoE HP 3PAR 7200 appliance
- On an average, less than 8 TB of data changed every day. Global Foundries’ home grown application was using Oracle 11G for the underlying database and had 60-40 read-write ratio.
- At peak throughput of 400 MBps, they wanted latencies under 30 ms, and for sustained 100MBps throughput, they wanted 10-15 ms latencies.
- EMC proposed deploying their FastCache functionality with EMC branded SAS SSDs within the CX4 appliance. 2 TB of Fast Cache SSDs were deployed.
- HP proposed deploying SSDs within the StoreServ appliance and tiering data to SSDs from disks. Again 2 TB of SSDs were deployed.
- VirtuCache using 400 GB of Micron SAS SSDs in each of the six ESXi blade servers.
|EMC FastCache with EMC MLC SAS SSD||HP 3PAR Tiering to HP MLC SAS SSD||VirtuCache and Micron SAS SSD on each blade|
|Avg Read MBps||86||102||286|
|Avg Write MBps||8||9||11|
|Avg Read Latency ms||18||15||5|
|Avg Write Latency ms||14||10||6|
|Cost *||$160,000Includes FastCache license||$ 40,000Includes data tiering functionality||$ 19,000Includes VirtuCache Licensing for 6 hosts|
UCLA has deployed Virtual Desktops for students and staff using VMware Horizon View. End users of these virtual desktops complained about slow boot times, Windows cursor and start button freezing and generally slow response times from the virtual desktops at various times during the day.
Call Center Workflow Management software is storage IO intensive since it involves ingesting and analyzing large volumes of audio. By caching from slower storage to in-host SSDs/DRAM, VirtuCache improved storage performance considerably thus improving the performance of Verint's Call Center Workflow software running within VMs.