As an update to the previous post, we now have the Tech Guide for RDMA performance with non-volatile storage available online.
As you might know, DRBD Manage is a tool that is used in the DRBD9 stack to manage (create, remove, snapshot) DRBD resources in a multi-node DRBD cluster. DRBD Manage stores the cluster information in the so called Control Volume. The control volume is a DRBD9 resource itself which is then replicated across the whole cluster. This means that the control volume itself is just a block device, like all the regular DRBD resources. Continue reading
SanDisk Corporation designs, develops and manufactures flash memory storage solutions. LINBIT is known for developing DRBD (Distributed Replicated Block Device), the backbone of Linux High Availability software. LINBIT tested how quickly data can be synchronously replicated from a SanDisk 800 GB SSD in server A, to an identical SSD located in server B. Disaster Recovery replication was also investigated, using the same hardware to an off-site server.
Over the next few weeks we’ll be posting results from tests that we’ve run against various manufactures SSD drives; including Intel, SanDisk, and Micron, to name a few.
The first post in this series goes over our findings of the Intel DC S 3700 Series 800GB SATA SSD drives. Continue reading
DRBD9 has a new transport abstraction layer and it is designed for speed; apart from
TCP the next generation link will be
So, what is RDMA, and how is it different from TCP? Continue reading
We often see people on
#drbd or on
drbd-user trying to measure the performance of their setup. Here are a few best practices to do this. Continue reading
When DRBD 8.4.4 integrated TRIM/Discard support, a lot of things got much better… for example, 700MB/sec over a 1GBit/sec connection. Continue reading
In the “Root-on-DRBD” Tech-Guide we showed how to cleanly get DRBD below the Root filesystem, how to use it, and a few advantages and disadvantages. Now, if there’s a complete, live, backup of a machine available, a few more use-cases become available; here we want to discuss testing upgrades of production servers.