wiredsraka.blogg.se - Fhash storage

#Fhash storage update
#Fhash storage software
#Fhash storage series

#Fhash storage software

If you are using a VM (Virtual Machine) Flash performance may be affected depending on the details of how your VM software interacts with the host.

Settings for keeping the Flash device usage below this are in the configuration file. In order to have the best performance, you will need to have the Flash device 50% free. Aerospike handles that on a continual basis, but the software does require space to do this. Because Aerospike uses SSDs as raw devices for data, you do not need to defragment the drive separately.Striping across Flash devices will increase latency and decrease throughput. As mentioned above, using RAID at any level adds latency.

#Fhash storage series

If you are using RAID controllers, please make sure you have them in JBOD (Just a Bunch Of Disks) mode or as a series of RAID 0 arrays (one per disk).

Use direct attach rather than RAID, if possible.

So SSDs that have performed very well in our benchmarks may be middling in other benchmarks, but the ones that do well in the other benchmarks do not pass our tests. Aerospike has specific ways that it handles data that are different from consumer use.

Be careful comparing the results from our ACT test tool to other benchmarks.

This tool generates traffic similar to what Aerospike sees in production.

Aerospike uses a tool we created called ACT (available at GitHub).

It is very important to note a few things about our tests: Planning guide, or use Aerospike's benchmarking tool, to determine how many drives, and what type, to acquire.

Determine three planning factors: your object size, your read/write ratio and your required latency.

You also need to consider the ephemeral nature of direct attach Flash in cloud deployments, and configure a persistent store through our While you can't choose a different Flash drive, you will need to determine the correct instance types, and number of instances, Using cloud-based Flash storage has extra considerations.

While manufacturers already take this into account, some drives may benefit from extra overprovisioning in high-write uses.

This is the space given to the controller to help with garbage collection, wear-leveling, and bad block mapping. If SAS or SATA drives are being used through an HBA or SAN, a JBOD configuration is preferred, allowing Aerospike to distribute load across the devices.įlash devices may perform better when over-provisioned. This allows the database to run a background job that is able to reclaim space continually.Īerospike distributes the data across Flash devices. While Aerospike can be configured with a file system (and must be for the specific case ofįlash index), Aerospike prefers to be configured with block device storage for data devices. This wears Flash evenly and means that Aerospike customers can expect very good durability.Īll databases must at some point reclaim data.

#Fhash storage update

In order to avoid creating uneven wear on a single part of the SSD, Aerospike does not update data in-place. This gives near-RAM latencies, but provides durability and persistence. How Aerospike uses Flash storage īecause flash devices have no moving parts, they are already perfect for random reads. And they usually deliver relatively poor overall storage system utilization.When Flash devices (SSDs) are used for storage, they are often the most important hardware consideration.Īerospike has optimized the database to take advantage of Flash storage. Approaches such as investments in dedicated storage systems per application, the distribution of data over as many hard disks as possible, or frequent system tuning are only stop-gap solutions at best. Temporary solutions based on hard disks can be expensive as well – and their performance is much lower than SSD solutions. Although SSDs are more expensive in terms of purchase price, the added cost is offset when they are deployed in environments which require high performance levels. Performance and response issues could be solved immediately if all the data in performance-intensive applications resided on a storage system equipped with SSDs. Solid state drives (SSDs) can increase speed by a factor of 100 or more, and they considerably outperform hard disks. Performance-hungry databases, time-consuming data analyses, frequently accessed online applications and virtualized server or desktop environments can lead to storage bottlenecks very quickly. The fastest servers and network connections in the world are not much help if storage systems cannot read or write data at a rapid pace.