#FHASH STORAGE INSTALL#
#FHASH STORAGE UPDATE#
#FHASH STORAGE SOFTWARE#
#FHASH STORAGE SERIES#

You should not format your Flash devices that are going to be used for data. In the case of SATA configuration, you will likely have a RAID controller, which should be configured in pass-through mode. Newer 2.5' U.2 devices, which look like SATA drives and will be inserted into a chassis through the front panel. In 2018, Flash devices have migrated from SATA to NVMe, whichĬomes in two form factors: PCIe cards (Add In Cards, or AIC, usually Half Height Half Length HHHL), or

#FHASH STORAGE INSTALL#

How you install the Flash devices into the server is dependent on the vendor of the server and your connector. When looking at purchasing hardware make sure the there is at least one other drive for the operating system. This increases predictability for performance of any database,īut Aerospike's load on storage is extreme, and can interfere with logging and other OS processes. Installing and configuring Flash devices is not exactly the same as using rotational drives.Īerospike recommends that you use dedicated drives or storage devices. In the case of Amazon EC2, for example, we only support the Amazon Linux Distribution operating system. We recommend researching the best platforms for use.

#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. 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.

Fhash storage