SLIDE 1
What are we talking about?
Write I/O Replicate Acknowledge
Primary Node Secondary Node
Read I/O Read I/O Write I/O Replicate Acknowledge
Database HA with a Punch MySQL with DRBD for Dolphin Express What - - PowerPoint PPT Presentation
Database HA with a Punch MySQL with DRBD for Dolphin Express What - - PowerPoint PPT Presentation
Database HA with a Punch MySQL with DRBD for Dolphin Express What are we talking about? Write I/O Write I/O Read I/O Read I/O Primary Node Replicate Replicate Acknowledge Acknowledge Secondary Node What issue did we want to solve?
SLIDE 2
SLIDE 3
What issue did we want to solve?
Latency Penalty Time Disk Write Disk Write Network Replication Network Acknowledgment
Local Node Peer Node
SLIDE 4
What issue did we want to solve?
Latency Penalty Time Disk Write Disk Write Network Replication Network Acknowledgment
Local Node Peer Node
SLIDE 5
What issue did we want to solve?
Latency Penalty Time Disk Write Disk Write Network Replication Network Acknowledgment
Local Node Peer Node
SLIDE 6
What is Dolphin Express?
- Hostbus Adapter
- Cables:
- Standard CX4 copper
- Fiber
- PCI Express 1.1 x8, low profile, half size
- Low power consumption (no cooling required)
- Features:
- Transparent remote memory access by the
CPU (PIO)
- Efficient dual-engine DMA
- Fine-grain interrupt control
SLIDE 7
How do SuperSockets work?
DRBD module Node A TCP sockets IP eth driver
SuperSockets Ethernet NIC Dolphin Express
Node B TCP sockets IP eth driver
SuperSockets Ethernet NIC Dolphin Express
DRBD module
AF_INET AF_INET AF_SSOCKS AF_SSOCKS
SLIDE 8
What did we achieve?
BBWC DRBD (GbE) DRBD (10GE) DRBD (DX) 50 100 150 200 250 300
Sector Write Latency (µs)
SLIDE 9
What did we achieve?
512 4k 128k 50 100 150 200 250 300 350 400 450 500
GigE 10GbE SuperSockets
FIO Benchmark Throughput
SLIDE 10
Scale-out on Steroids!
Active Master Standby Master
Heartbeat IP Management
Slaves
SLIDE 11
DRBD on DX... on the fly
- Shut down Secondary, install Dolphin
Express/SuperSockets
- Update DRBD
- 8.2.7 and above with SuperSockets support
- Restart Secondary, wait for resync to complete
- This operation will run over Ethernet (SuperSockets
fail-over mode)
- Fail over, promoting Secondary to Primary
- Repeat on peer
Now, DRBD will run over SuperSockets!
SLIDE 12
So what else is new?
- DRBD Device Stacking extends cluster to 3 or 4
possible nodes
- 2 DRBD devices layered atop one another
- Top-level device is a cluster resource
- May use 2 different replication protocols
SLIDE 13
Device Stacking Explained
alice bob charlie daisy Low-level resources Stacked resource App FS
SLIDE 14
Device Stacking Explained
alice bob charlie daisy Low-level resources Stacked resource App FS
SLIDE 15
Device Stacking Explained
alice bob charlie daisy Low-level resources Stacked resource App FS
SLIDE 16
Device Stacking Explained
alice bob charlie daisy Low-level resources Stacked resource App FS
SLIDE 17
Post-8.3 additions
- DRBD Proxy (March 2009)
- Very efficient bandwidth utilization, plus zlib compression
- DRBD 8.3.2 (April 2009)
- Bitmap transfer RLE encoding
- Post-DRBD 8.3.2
- Removing 16 TB device limitation (up to 64 ZB?)
SLIDE 18
Questions!
Fire away...
SLIDE 19