The data stored on a local instance
store will persist only as long as that instance is alive. However, data that
is stored on an Amazon EBS volume will persist independently of the life of the
instance. Therefore, we recommend that you use the local instance store for
temporary data and, for data requiring a higher level of durability, we
recommend using Amazon EBS volumes or backing up the data to Amazon S3. If you
are using an Amazon EBS volume as a root partition, you will need to set the
Delete On Terminate flag to "N" if you want your Amazon EBS volume to
persist outside the life of the instance.
Amazon EBS provides four current
generation volume types and are divided into two major categories: SSD-backed
storage for transactional workloads and HDD-backed storage for throughput
intensive workloads. These volume types differ in performance
characteristics and price, allowing you to tailor your storage performance and
cost to the needs of your applications. For more information on see the EBS product details page, and for additional information
on performance, see the Amazon EC2 User Guide's EBS Performance section.
Q: What are Throughput Optimized HDD
(st1) and Cold HDD (sc1) volume types?
ST1 volumes are backed by hard disk
drives (HDDs) and are ideal for frequently accessed, throughput intensive
workloads with large datasets and large I/O sizes, such as MapReduce, Kafka,
log processing, data warehouse, and ETL workloads. These volumes deliver
performance in terms of throughput, measured in MB/s, and include the ability
to burst up to 250 MB/s per TB, with a baseline throughput of 40 MB/s per TB
and a maximum throughput of 500 MB/s per volume. ST1 is designed to deliver the
expected throughput performance 99% of the time and has enough I/O credits to
support a full-volume scan at the burst rate.
SC1 volumes are backed by hard disk
drives (HDDs) and provides the lowest cost per GB of all EBS volume types. It
is ideal for less frequently accessed workloads with large, cold datasets.
Similar to st1, sc1 provides a burst model: these volumes can burst up to 80
MB/s per TB, with a baseline throughput of 12 MB/s per TB and a maximum
throughput of 250 MB/s per volume. For infrequently accessed data, sc1 provides
extremely inexpensive storage. SC1 is designed to deliver the expected
throughput performance 99% of the time and has enough I/O credits to support a
full-volume scan at the burst rate.
Q: Which volume type should I choose?
Amazon EBS includes two major
categories of storage: SSD-backed storage for transactional workloads (performance
depends primarily on IOPS) and HDD-backed storage for throughput workloads
(performance depends primarily on throughput, measured in MB/s). SSD-backed
volumes are designed for transactional, IOPS-intensive database workloads, boot
volumes, and workloads that require high IOPS. SSD-backed volumes include
Provisioned IOPS SSD (io1) and General Purpose SSD (gp2). HDD-backed volumes
are designed for throughput-intensive and big-data workloads, large I/O sizes,
and sequential I/O patterns. HDD-backed volumes include Throughput Optimized
HDD (st1) and Cold HDD (sc1). For more information on Amazon EBS see the EBS product details page.
Q: Do you support multiple instances
accessing a single volume?
While you are able to attach multiple
volumes to a single instance, attaching multiple instances to one volume is not
supported at this time.
No, EBS snapshots are only available
through the Amazon EC2 APIs.
Q: Do volumes need to be un-mounted
in order to take a snapshot? Does the snapshot need to complete before the
volume can be used again?
No, snapshots can be done in real
time while the volume is attached and in use. However, snapshots only capture
data that has been written to your Amazon EBS volume, which might exclude any
data that has been locally cached by your application or OS. In order to ensure
consistent snapshots on volumes attached to an instance, we recommend cleanly detaching
the volume, issuing the snapshot command, and then reattaching the volume. For
Amazon EBS volumes that serve as root devices, we recommend shutting down the
machine to take a clean snapshot.
Each snapshot is given a unique
identifier, and customers can create volumes based on any of their existing
snapshots.
If you share a snapshot, you won’t be
charged when other users make a copy of your snapshot. If you make a copy of
another user’s shared volume, you will be charged normal EBS rates.
Users who have permission to create
volumes based on your shared snapshots will first make a copy of the snapshot
into their account. Users can modify their own copies of the data, but the data
on your original snapshot and any other volumes created by other users from
your original snapshot will remain unmodified.
You can find snapshots that have been
shared with you by selecting “Private Snapshots” from the viewing dropdown in
the Snapshots section of the AWS Management Console. This section will list
both snapshots you own and snapshots that have been shared with you.
You can find snapshots that have been
shared globally by selecting “Public Snapshots” from the viewing dropdown in
the Snapshots section of the AWS Management Console.
Q: Do you offer encryption on Amazon
EBS volumes and snapshots?
Yes. EBS offers seamless encryption
of data volumes and snapshots. EBS encryption better enables you to meet
security and encryption compliance requirements.
All information on Public Data Sets
is available in our Public Data Sets Resource Center. You can also obtain a listing of
Public Data Sets within the AWS Management Console by choosing “Amazon
Snapshots” from the viewing dropdown in the Snapshots section.
Q: Where can I learn more about EBS?
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