ds8000 replication performance considerations · ds8000 replication performance considerations lisa...
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DS8000 Replication
Performance Considerations
Lisa Gundy
DFSMS Copy Services Architect
IBM Systems Division
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Agenda
05-Mar-15 3
• Replication Review
• Multiple Incremental FlashCopy
• Multi-Target PPRC Performance
• PPRC Synchronization
• Global Copy Collision Enhancement
• zHyperWrite ©
• Workload Based z/OS Global Mirror
(XRC) Write Pacing
• Easy Tier Heat Map Transfer
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Out of
Region
Site C/D
Metro Global Mirror
Metro z/OS Global Mirror
Three site and Four Site
Synchronous &
Asynchronous Mirroring
FlashCopy
Point in Time Copy
Within the
same
Storage
System
Out of Region
Site B
Global Mirror
z/OS Global Mirror
Asynchronous
Mirroring
Primary
Site A
Primary
Site A
Metro distance
Site B
Metro Mirror
Synchronous Mirroring
DS8000 Replication Review
Primary
Site A
Metro
Site B
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Multiple Incremental FlashCopy
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Multiple Incremental FlashCopy
• Previously only a single incremental FlashCopy
was allowed for any individual volume
• This provides the capability for up to 12
incremental FlashCopies for any volume
• A significant number of clients take two (or
more) FlashCopies per day for database backup
both of which can now be incremental
• The Global Mirror journal FlashCopy also counts
as an incremental FlashCopy so the testing
copy can now also be incremental
• The functionality is also available as an RPQ
from R7.1.5
S
T1 T2 T12
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MultiTarget Metro Mirror
Performance
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Multi-Target Metro Mirror• Allow a single volumes to be the source for
more than one PPRC relationship
• Provide incremental resynchronization functionality between target devices
• Use cases include
– Synchronous replication within a datacentre combined with another metro distance synchronous relationship
– Add another synchronous replication for migration without interrupting existing replication
– Allow multi-target Metro Global Mirror as well as cascading for greater flexibility and simplified operational scenarios
– Combine with cascading relationships for 4-site topologies and migration scenarios
Metro
Mirror
Metro
Mirror
H2
H3
H1
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MultiTarget Metro Mirror Performance
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000
Resp
on
se T
ime (
ms)
IOps
No Mirroring Single Metro Mirror Multi-target Metro Mirror
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MultiTargetSingle
Target
No Mirror
4KB Writes
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MultiTarget Metro Mirror Performance
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
20,000 40,000 60,000 80,000 100,000 120,000 140,000
Resp
on
se T
ime (
ms)
IOps
No Mirroring Single Metro Mirror Multi-target Metro Mirror
© Copyright IBM Corporation 2014
MultiTarget
Single
Target
No Mirror
27KB Writes
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PPRC Synchronization
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PPRC Synchronization• The asynchronous copying of data
from a PPRC primary to a
secondary.
• Copies data that is out-of-sync
between primary and secondary
– Initial copy when a pair is
established or resumed
– Global Copy / Global Mirror to
asynchronously transfer updated
data
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H1
H2
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Pre-7.4 Design
• Volume based
– When a volume spans ranks, only the part on one rank copied at a time
• Did not scale with volume size
– Resources allocated per volume, regardless of size
• No priority mechanism
• Unable to handle multiple relationships on a volume for MultiTarget PPRC
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Objectives
• Support MultiTarget PPRC
• Finish the copy as quickly as
possible
– Fully utilize the PPRC links
• Minimize the impact on other work
– Do not overdrive the ranks on the
primary
– Minimize impact on host I/O
• Do the most important work first
– Priority scheme
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H1
H3
H2
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New Design• Balances workload across:
– PPRC Ports
– Extent Pools
– Device Adapters
– Ranks
• Assigns priorities
– For example, forming GM consistency groups >
Resynchronization
• Unit of work is an extent
– Scales with volume size
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Global Copy Collision Avoidance
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Global Copy Collision
• Collision definition:
– Track is locked for Global Copy to transfer it to the secondary
– Host write occurs for same track.
• Result:
– Host write must wait for Global Copy transfer to complete
– Impact to application
• Not usually a problem except for situations with
– Have unstable networks
– Have high latency / long distance networks
– Have workloads with a high rate of data re-reference (e.g. logging)
– Have very latency sensitive applications
© Copyright IBM Corporation 2014
Global Copy
1
0
0
0
0
1
0
Track in the process of being
sent is locked to prevent
writes from occurring
H1 H2
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Global Copy Collision Avoidance• Global Copy releases track lock
after transfer of data to local host
adapter
• Allows Host Write to access track
immediately without waiting for
Global Copy transfer to complete
• Global Copy detects when track
has been modified by another
host write
• Available with R7.4 and as RPQ
on R7.2 and R6.3
© Copyright IBM Corporation 2014
Global Copy
1
0
0
0
0
1
0
H1 H2
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IBM zHyperWrite
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zHyperWrite• Improved DB2 Log Write
Performance with DS8870 Metro
Mirror
– Reduces latency overhead
compared to normal storage
based synchronous mirroring
• Reduced write latency and
improved log throughput
© Copyright IBM Corporation 2014
P S
Log UCB Log UCB
Data UCB
DB2
Metro Mirror
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DB2 Log Write with Metro Mirror
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P S
DB2
1. DB2 Log Write to Metro Mirror
Primary
2. Write Mirrored to Secondary
3. Write Acknowledged to Primary
4. Write Acknowledged to DB2
ACK
ACK
Metro Mirror
▼
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Write with zHyperWrite
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P S
DB2
1. DB2 Log Write to Metro Mirror
Primary and Secondary in parallel
2. Writes Acknowledged to DB2
3. Metro Mirror does not mirror the
data. ACK
Metro Mirror
ACK
▼
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IBM zHyperWrite• Supports HyperSwap with TPC-R
or GDPS
• Enabled through
– SYS1.PARMLIB(IECIOSxx)
– SETIOS command
– DS8870 R7.4, IOS, DFSMS PTF’s
© Copyright IBM Corporation 2014
P S
Log UCB Log UCB
Data UCB
DB2
Metro Mirror
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z/OS (XRC) Global Mirror
Workload Based Write Pacing
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z/GM (XRC) Workload Based Write Pacing
• Need for Write Pacing
• Current Write Pacing
• Limitations of Current Write Pacing
• Requirements
• Use of Workload Manager (WLM)
• Example
• Implementation Requirements
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SP
z/GM System
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Application
Writes
Modified Data read
by SDM Consistency Groups
created
Data Journaled and
Written to secondary
SDM
Data Buffered
in Sidefile
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Need for Write Pacing
• Write data is buffered in the DS8000
sidefiles
– Maximum sidefile size is finite
• Burst write rates can exceed capacity
to offload data
– Sidefiles grow
– RPO increases
– Possible suspension if persists
• Write Pacing monitors sidefile size
and injects delays to flatten out peaks
of the write rate
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Previous XRC Write Pacing
• Volume based
– Sidefile count monitored for each volume
• Thresholds and Maximum Delay are specified for each volume
– Different volumes may have different values
• If the sidefile count for a volume grows:
– Delays injected for writes to that volume
– Delay starts very small
• Delay increased if sidefile count increases, up to maximum
allowed
• Delay reduced if sidefile count decreases
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Write Pacing Step Function
© Copyright IBM Corporation 2014
0
2
4
6
8
10
12
0 200 400 600 800 1000 1200 1400
Delay / Level
Sidefile Count
Write Pacing Step at Threshold = 1000
Max Level 10
0.04 ms
0.2 ms
1 ms
5 ms
25 ms
100 ms
Max Level 5
Max Level 2
Max Level 1
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Limitations to Previous Write Pacing
• Different applications have different response time requirements
• These requirements are currently met by:
– Assigning different pacing threshold and limits to different volumes
– Placing data on volumes with the appropriate pacing levels
• Requires significant planning for data placement
• If requirements change, data must be moved to different volume
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Write Pacing Requirements
• Meet application response time and performance
objectives
• Maintain disaster recovery capability within desired
Recovery Point Objective (RPO)
• Minimize the amount of manual planning and intervention
• Automatically adapt to changing application needs
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Workload Manager
• z/OS Workload Manager (WLM) provides ability to set performance
goals
• Applications with similar goals are grouped into Service Classes
• WLM assigns resources to maximize goal achievement
• One part of the resource management is that I/O has an
importance value
– Six importance values:
• 1 = Highest
• 5 = Lowest
• 6 = Discretionary (or default, when not part of a service class)
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Workload Based z/GM Write Pacing
• Takes into account the I/O’s importance value from WLM
when determining the amount of pacing
• Each importance level is mapped to a Maximum Pacing
Level
• Pacing levels are set so that higher importance I/O is
paced less then lower importance I/O
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Example with WL Based Pacing
Importance
Level Pacing Level
Workload Pacing
Delay
Volume Pacing
Delay
1 (high) 4 0.04ms 0.2ms
3 (med) 8 0.2ms 0.2ms
5 (low) 12 1.0ms 0.2ms
© Copyright IBM Corporation 2014
• Given:
– Threshold level = 1000
– Sidefile count = 500
– Volume Pacing level = 8
• Delay varies based on I/O’s importance
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Implementation Requirements
• Configure WLM
• Define Workload Classes
• Enable IO Priority Management
• Determine maximum delay for each workload class
• Specify these values in the XRC PARMLIB
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Easy Tier Heat Map Transfer
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Easy Tier Heat Map – With PPRC
• Heat Map maintained at
both the primary and the
secondary
• But… I/O at the
secondary is different
from that at the primary
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Replication
H1 H2
▼
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Server
HMT software
Easy Tier Heat Map Transfer• Transfers Easy Tier Heat
Map information for a
volume
• Out of band software
implementation
• TPC-R and GDPS support
as well as standalone utility
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Replication
HMC
H1 H2
HMC
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Heat Map Transfer Measurement
© Copyright IBM Corporation 2014
No Easy Tier Primary w/
Easy Tier
Secondary w/
Easy Tier
Secondary w/
Heat Map
Transfer
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Easy Tier Heat Map Transfer• GDPS/PPRC support available in
an SPE with GDPS 3.10 and
GDPS/GM support available with
GDPS 3.11
• GDPS/XRC support is planned to
be released next
• 3 and 4 site support planned by
combining the different functions
© Copyright IBM Corporation 2014
Ksys
GDPS
Netview
USS
HMT demon
Replication
HMC
H1 H2
HMC
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Session Summary
• Replication Overview
• Multiple Incremental FlashCopy
• MultiTarget PPRC Performance
• PPRC Synchronization
• Global Copy Collision Enhancement
• zHyperWrite
• Workload Based z/OS Global Mirror Write Pacing
• Easy Tier Heat Map Transfer
© Copyright IBM Corporation 2014