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RAMSan:
PCI
Storage Flash Storage
RAM Storage
- The World's Fastest Storage®
- Accelerates Oracle redo logs, temporary
tablespaces, and undo logs, as well as similar components of SQL Server and
other databases
- Directly attached to database servers, network
attached, or deployed in a storage area network
- Recognized by the OS as just another disk
drive
- Write Accelerator frees up servers and boosts
performance.
The Write Accelerator from Texas Memory Systems accelerates write-intensive
Oracle databases.
The Write Accelerator is specifically designed to
increase Oracle database performance. It accelerates Oracle databases by
allowing them to handle substantially greater transaction volumes and add more
concurrent users. The Write Accelerator can deliver many times the performance
of a standard cached-RAID array and is more easily installed and managed by
enterprises whose operations rely on Oracle-resident applications.
The Write Accelerator works on a simple premise:
performance of write intensive databases is limited by two factors – latency and
throughput. The Write Accelerator, a special edition RamSan solid state disk
solution, offers unparalleled latency and throughput and unbinds Oracle
applications limited by slow writes.
Solutions designed to accelerate writes must meet
three requirements: tightly integrate with the operating systems that run
Oracle, support Oracle and Oracle ASM, and follow Oracle’s stripe and mirror
everything (SAME) rule. The Write Accelerator supports Oracle in Windows,
Linux, Solaris, HP-UX, OpenVMS, and AIX environments, among others. The systems
have been deployed with Oracle databases from Oracle 8i to Oracle 11g, including
support for Oracle RAC and Oracle ASM. The Write Accelerator consists of two
separate but bundled units, enabling complete support for SAME and allowing even
the most demanding enterprises in the world 5-nines reliability for the
solution.
The Write Accelerator can be directly attached to
Oracle database servers or attached to storage networking components. Special
skills or training are not required to install and administer a Write
Accelerator. Administrators simply move their redo logs, undo segments, or
temporary tablespaces to the Write Accelerator. Neither the Oracle database
itself nor the operating system need to be modified to support the Write
Accelerator.
“Write activity in Oracle is mostly a factor of
the performance of the redo logs, undo segments, and temporary tablespaces,”
says Mike Ault, Oracle Guru at Texas Memory Systems and author of more than 20
books on Oracle performance and tuning-related topics. “By moving these files to
the Write Accelerator, application performance is boosted as server resources
are made available to support more transactions and more concurrent users.
Plugging it in is easier, more effective, and less costly than adding additional
RAID arrays or constantly tuning the database.”
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Oracle database administrators can determine if
their application suffers from write contention or other I/O performance issues
by analyzing their Oracle Statspack and Automated Workload Repository (AWR)
reports using the free tool at StatspackAnalyzer.com, an Oracle
community forum co-sponsored by Texas Memory Systems and Burleson Consulting.
The Write Accelerator connects to servers or
network fabrics through basic Fibre Channel or InfiniBand interfaces and
appears simply as a very fast disk to the network, able to act as any disk or
storage system might. The Write Accelerator acheives dramatic performance
gains in Oracle redo logs, temporary tablespaces, and
undo segments.
The Write Accelerator solution incorporates two individual solid state disk
systems mirrored in host-side or Oracle ASM configurations, providing the
highest degree of data protection and system reliability. In addition, each
individual unit of the Write Accelerator solution includes multiple
reliability features, including hot swappable power supplies and backup hard
disks, redundant cooling fans, batteries, and optional redundant failover data
ports. ChipKill technology, ECC and soft error scrubbing, and Active Backup,
as noted below, are also part of the Write Accelerator’s suite of
sophisticated reliability features.
The Write Accelerator is designed to look like a disk to the network. It is
highly interoperable and works in virtually any enterprise environment. It is
installed in numerous environments, including AIX, Solaris, HP-UX, OpenVMS,
Tandem, Linux, and Windows. Hardware from Fibre Channel and InfiniBand vendors
including Cisco, Emulex, Brocade, McData, Mellanox, QLogic, LSI Logic, and
ATTO easily interoperates with the Write Accelerator.
The Write Accelerator includes the reliability and fuctionality of Active
Backup®. Other SSDs and cache systems can only "destage" data from RAM to
backup disks once power is already lost. This means that data is never backed
up during normal operation and the time-to-complete-backup after power loss is
unacceptably long. A Write Accelerator with Active Backup can continuously
back up data on RAM to the internal backup hard disks without impacting
performance. This means in an emergency situation data is anywhere from
60-100% on the backup hard drives already.
Write Accelerator systems take reliability even farther by implementing IBM
Chipkill technology. Standard error correcting code (ECC) implementations
correct single-bit data errors in memory chips but cannot correct the
multi-bit errors that can result in data integrity issues. Chipkill technology
allows a memory system to correct a multi-bit failure up to and including a
total chip failure.
All solid state disks can correct a single bit error before sending data to
the server as a part of their ECC protection. The Write Accelerator, however,
goes a step further by scrubbing, re-writing the corrected data to memory and
then verifying the re-write to determine if a memory chip has a failure (a
hard error) or if radiation transients caused the single bit error (a soft
error). Systems that do not scrub single bit memory errors will either a)
report errors to a system log that will eventually encourage replacement of a
memory board or b) hide these errors thus leaving a potentially unsafe memory
board in the system. Research on this topic suggests that 90% of single bit
errors are soft errors. In these cases, the Write Accelerator will correct the
error through the scrubbing process and prevent unnecessary downtime to
replace the memory board.
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The Write Accelerator Solution includes two individual Solid State Disk units.
These are the specs of one of the two units:
| I/Os Per Second |
| 200,000 |
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| Capacity |
| 16-32 GB |
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| Bandwidth |
| 1.5 GB per second |
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| Latency |
| Less than 15 microseconds |
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| Fibre Channel Connection
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- 4-Gigabit Fibre Channel (2-Gigabit
capable)
- 2 ports standard; up to 4 ports
available
- Supports point-to-point, arbitrated
loop, and switched fabric topologies
- Interoperable with Fibre Channel Host
Bus Adaptors, switches, and operating systems
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| InfiniBand Connection
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- 4x InfiniBand (10-Gigabit)
- 1 port standard; up to 2 ports available
- Supports SRP upper level protocol
- Interoperable with InfiniBand Host
Channel Adaptors, switches, and operating systems
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| Management |
- Browser-enabled system monitoring,
management, and configuration
- Telnet management capability
- Front panel displays system status and
provides basic management functionality
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| LUN Support |
- 1 to 1024 LUNs with variable capacity
per LUN
- Flexible assignment of LUNs to ports
- Hardware LUN masking
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| Data Retention |
- Non-volatile solid state disk
- Redundant internal batteries power the
system for 25 minutes after power loss
- Automatically backs up data to disk at
60 MB/sec
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| Reliability and Availability
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- Chipkill technology protects data
against memory errors up to and including loss of an entire memory chip
- Internal redundancies
- Power supplies and fans
- Backup battery power
- Backup hard disk drives (mirrored)
- Hot-swappable components
- Two backup hard drives (front access)
- Power supplies
- Soft Error Scrubbing
- When a single bit error occurs on a read, the RamSan will
automatically re-write the data to memory thus scrubbing soft errors.
Following the re-write the system re-reads to verify the data is
corrected.
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Supports two backup modes that are configurable per system or per LUN: |
- Data Sync mode - synchronizes data to
redundant internal disk drives before shutdown or with power loss
- Active Backup® mode (optional) - backs
up data constantly to internal redundant disks without impacting system
performance.
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| Size |
| 5.25" (3U) X 16" |
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| Power Consumption (peak)
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| 250 Watts |
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| Weight (maximum) |
| 70 lbs |
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