HP0-P19 exam Dumps Source : HP-UX lofty Availability Using Serviceguard v18
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I might not proceed through each permutation of supported disk and LAN applied sciences. but I carryout exigency to jog your reminiscence about single facets Of Failure when it comes to hardware components. i'll proceed away it as much as you to discharge a hardware stock to create inescapable that you should not Have an SPOF in your design.
SPU: It isn't a requirement for each node in a cluster to breathe configured the exact very manner, from a hardware perspective. It is not not viable to employ a reduce-powered development server as a Standby node in case your leading application server fails. remember to filch some time to filch note the performance and exorbitant availability implications of working consumer functions on a server with a varied configuration.
These are the devices that are surely to fail. create certain that you present enough insurance policy in your operating materiel disks as well as your records disks.
applying incredibly available RAID disk arrays improves your chances of now not sustaining an outage due to a single disk failure.
if you're using Fibre Channel, create certain that each node has two divide connections to your storage contraptions by passage of two divide Fibre Channel switches.
ensure that hardware options Have dissimilar vigour materials from different sources.
application accessories can present RAID capabilities as well; LVM can present RAID 0, 1, 0/1. VxVM can proffer RAID 0, 1, 0/1, 1/0, and 5. When employing utility RAID, breathe certain that mirrored disks are on divide controllers and powered from a divide verve give.
Ideally, Have at the least one divide heartbeat LAN.
Ideally, Have a standby LAN for total LAN interfaces, together with heartbeat LANs.
make the most of numerous bridges/switches between active and standby LANs.
If making employ of distinctive routed IP networks between servers and valued clientele, create inescapable that numerous routers are used.
make certain that total individuals of a network can aid dynamic routing.
endeavor to create the most of essentially the most powerful routing protocols, e.g., RIP2 or even superior OSPF.
If making employ of FDDI, create certain that dual attached stations are attached to divide concentrators.
make certain that you Have at the least two unbiased vigour components.
impartial verve elements should breathe fed from two external energy turbines; that includes power deliver companies. filch the situation the district you've got two unbiased vigour feeds into your information core each from XYZ producing enterprise. If XYZ producing enterprise goes "bust" or loses the capability to deliver you with electricity, you're a bit in a pickle. If total else fails, your second verve deliver should Come from an onsite generator.
always test the capability of your 2d verve provide to "kick in" seamlessly when your fundamental provide fails.
You exigency to account your records middle as an SPOF. how are you going to cope with this? this may contain a disaster recuperation procedure together with offsite tape data storage or may well breathe as subtle as an superior cluster solution corresponding to Metrocluster or Continentalclusters incorporating asynchronous information replication over a DWDM or WAN link.
ensure that administration knows the implications of now not together with your data core within the universal lofty Availability Plan.
should quiet an utility fail over to an active adoptive node, you may Have two applications running on one node. carryout the patrons of both functions breathe mindful and settle for this?
have you set up any carrier even Agreements together with your person communities concerning particular person utility performance?
How will you exploit the performance of individual applications within the event of a failover to an lively adoptive node?
Will you employ technologies akin to technique aid supervisor (PRM) and labor Load supervisor (WLM), or depart efficiency management to the fundamental UNIX scheduler?
Do clients exigency to discharge a UNIX login to the node it's working their utility?
Does the consumer's utility require a UNIX consumer identity to discharge its own degree of customer authentication?
How will you manage proposing consistent UNIX user and community IDs throughout the entire cluster?
Do you utilize NIS, NIS+, or LDAP?
Do you utilize relied on programs?
Do you've got a protection coverage for particular person nodes?
Do you've got a safety coverage to your network(s)?
Do you Have got a security policy for the cluster?
Do you Have a safety policy for your information middle?
Do you've got a safety coverage for users?
Does every person involved recognize and filch note your safety policies?
Do you employ third-celebration safety consultants to discharge penetration checks?
Does your company Have an IT protection branch? in that case, carryout they role typical security audits? carryout they account the security implications of an HP lofty Availability Cluster?
That may quiet jog your reminiscence concerning the SPOF and matters regarding the supply of your purposes. As you could see, it's not nearly "throwing" hardware on the problem; there are lots of other technological and technique linked challenges that you'll exigency to mug if you're to proffer maximized uptime to your valued clientele.
Let's movement on to appear on the mechanics of setting up a primary lofty Availability Cluster.
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In a current designed to give service suppliers more flexibility in deploying and managing internet-primarily based purposes, Hewlett-Packard business has introduced multi-OS guide to a yoke of of its management equipment.
The alterations, which Have an result on HP’s Toptools, Servicecontrol supervisor, procedure useful resource supervisor, and the HP-UX Workload manager, are intended to slice back the workload of particular person device directors by using allowing elements to breathe provisioned instantly across varied systems.
in line with HP, the adjustments symbolize its ongoing exertion to construct a platform unbiased management offering and create it the most efficacious dealer with a tightly built-in multi-OS management system for windows, HP-UX, and Linux.
“these days what they are looking to carryout is proffer one framework for how you carryout multi-gadget administration,” says an HP spokesperson near the challenge.
The materiel that these adjustments influence tarry a layer below HP’s OpenView techniques management providing. And while they're suppositious to breathe used as standalone products, they're wholly integratable with the OpenView providing.
Toptools, HP’s internet-primarily based administration product, now elements revision management with automatic updates, stronger discovery and stock administration. It also has a brand novel database export device and SQL import tool allowing superior records manipulation, and improved multi-OS help, together with HP-UX, home windows XP and Linux.
HP Servicecontrol supervisor, a methods management tool with net-enabled and command line interfaces, presents novel multi-OS manageability, accelerated scalability as much as 1,024 nodes, and expanded safety through authentication and encryption.
HP procedure aid supervisor for allocating CPU, reminiscence and disk I/O on HP-UX systems now offers more desirable materiel utilization and dynamic reallocations for Oracle environments through co-functioning with Oracle Database aid manager.
And HP-UX Workload supervisor is now increasing its capabilities to operate in a excessive-availability, clustered ambiance with the aid of integrating with HP MC/Serviceguard, HP's high-availability clustering solution for HP-UX-based mostly servers. additionally, it permits utility integration to create the most of instant skill on exact resources. ICOD makes it viable for the activation of additional processor skill addressing quickly IT fluctuation needs usually present in an online ambiance.
Toptools is bundled with every HP Intel IA-32-based mostly server and is accessible immediately. each Servicecontrol supervisor and the technique useful resource manager, that are bundled with each HP-UX-based mostly server, can breathe attainable in September of 2001.
HP-UX Workload supervisor is available automatically and starts at an estimated U.S. list price of $5,000.
With the enhancement’s HP has made to Toptools, Servicecontrol supervisor, technique resource manager, HP-UX Workload supervisor, an HP spokesperson says, “we've district a framework in location that permits you to launch functions concurrently on massive server environments.”
For more tips, hunt recommendation from www.hp.com (new window>
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Now that their cluster is up and running, it needs constant and heedful monitoring. In Chapter 10, "Monitoring System Resources," they discussed EMS HA Monitors. EMS HA Monitors can breathe configured to monitor the status of hardware resources as well as captious system resources. A Serviceguard cluster can breathe considered a captious system resource. As such, a cluster can breathe monitored from within the EMS framework to dispatch alarms to users and/or applications such as OpenView networking monitoring tools if the cluster experiences an expected event such as a LAN card or even an entire node failing.
In Chapter 27, they peer at using the Serviceguard Manager GUI to monitor cluster resources. Whatever tool you employ to monitor clusters, you should review total your IT processes in order to filch into account the requirements of a lofty Availability Cluster.
Clustered databases proffer a variety of advantages, as well as choices and challenges.By Ashish Nadkarni
You’ve heard the rumblings in the hallway: The databases are getting overloaded, and more projects are coming along. There is talk of upgrading Oracle to 10g RAC (Real Application Clusters). Then one day it’s official: You’re asked to uphold the database administrator (DBA) in implementing 10g RAC. But this is not your ordinary database upgrade: You hear terms enjoy ASM, CRS, OCR, Vote-disk, etc., and you inaugurate to wonder: Am I supporting a database or a all novel concept?
Having implemented these databases and having gone through the stitch of supporting one, I can expose you that never in my suffer as a systems administrator Have I ever had an application or a database cross the lines of demarcation among systems, storage, clustering, and lofty availability enjoy 10g RAC does. But convergence is inevitable. So here are some guidelines to assist systems/storage administrators in their determination to implement 10g RAC. Disclaimer: I am not a DBA, nor carryout I pretension to breathe an expert in 10g RAC.Do you exigency RAC?
The concept of implementing a database cluster (and they are not talking active/passive clustering here) may at first appear to decipher total your database-related problems, but in reality it may become a uphold quagmire, especially if the DBAs are novel to the RAC concept and you are supporting an environment that is radically different from the ease of the database environments in the company. So before diving into the details, create certain your team spends enough time looking at alternatives, such as simply increasing the processing power of your existing systems instead of clustering a lot of servers and creating a distributed database.Which OS platform?
A common misconception is that RAC is meant to breathe implemented on cheap Linux servers, thereby creating a “database farm.” That is not the case: 10g RAC is supported on various platforms, including Solaris, AIX, and HP-UX. If you don’t Have Linux in your environment your plans to implement RAC should not breathe a judgement to implement Linux. Your selection of platform should breathe based primarily on your console even and skills.
One caveat is that Oracle may not release patches and updates for total platforms at the very time. That is not to articulate that point patches will not breathe available should you escalate any issues to Oracle. Another thing to retain in irony is that Oracle recently switched its primary development platform from Linux to Solaris. Oracle is also a member of an IBM initiative on future AIX developments. That should give you a clue as to which operating systems will note 10g first. From a systems perspective this is the most expensive investment you will breathe making, so select wisely.Which clustering software?
For those who are used to clustering Oracle databases using third-party clustering software-such as Symantec’s Veritas Cluster Server, Sun Cluster, IBM HACMP, or HP MC/ServiceGuard-this may Come as news: Oracle now has a cluster engine-called Cluster Ready Services (CRS)-built into the 10g suite. This engine is particularly necessary when implementing RAC if you determine to also implement service names (see below). This is where you may suffer your first issue of contention between the DBA and systems administration teams.
Basically, Oracle pushes CRS as a replacement for third-party clustering products. However, the issue is how stable CRS really is. Most other clustering products are in their third or fourth generation and are very stable in non-RAC environments, and some of these products Have been upgraded to include RAC uphold as well. For example, Symantec’s Veritas Storage Foundation suite for 10g RAC is based on the very clustering platform that total its other clustering packages are based on. If your environment has a lot of (non-RAC) database clusters, this is a very necessary design decision.
Using third-party clustering engines will allow you to maintain a single, consistent framework across total your database instances. Additionally, these clustering products proffer platform/application integration and high-availability options that CRS does not yet provide. In short, CRS is a bundled clustering engine that does not quite compare to the functionality offered by more-mature clustering technologies.Which volume management and file system software?
Oracle now bundles Automated Storage Manager (ASM) in 10g. ASM performs the job of host-based volume management without the exigency for another volume manager on the system. From DBAs’ perspective, this is ideal since they don’t Have to depend on systems administrators for storage to breathe made available to the database; as soon as the storage is provisioned and made available to the system (in the configuration of raw devices), ASM can start using it. Although this sounds enjoy a value proposition because you don’t exigency extra volume management software for managing database objects, here are some points to consider:
As with CRS, ASM is ideal in scenarios where budget constraints limit the purchase of third-party volume management software. However, if you Have a big installation of third-party volume management software and a age storage provisioning process, filch a long difficult peer at ASM. Its adoption should breathe performed in a planned manner because it’s a novel product.What are some of the 10g dependencies?
SCSI-3 reservations and IO Fencing- The all notion behind a 10g RAC implementation is that total nodes participate access to total database objects. No matter what volume management or clustering software is used, SCSI reservation is a requirement to accomplish this.
If you are migrating from an older instance or Have older storage arrays that you are planning to employ for the novel RAC environment, chances are that either the storage arrays are not configured to handle SCSI reservations or they carryout not uphold it at all. Most modern arrays (especially if you are using Fibre Channel) uphold SCSI-3 persistent reservations (SCSI-3 PR). Some clustering engines, such as Veritas’ SFRAC, employ SCSI-3 persistent group reservation (SCSI-3 PGR) to implement a technique known as IO Fencing (sometimes called Disk Fencing), which is a system by which nodes can breathe stopped from accessing shared storage if they are not in a cluster. It allows the cluster engine to “eject a node” from the cluster, thereby protecting shared data.
SCSI-3 PGR will soon supersede total other forms of SCSI reservation technologies, such as SCSI-2 reservations. It is highly advisable to select a stack that uses SCSI-3 PGR when implementing RAC.
OCR and vote-disk-Oracle 10g RAC uses the concept of a vote-disk to retain total nodes in the cluster in sync. It also uses a registry (Oracle Cluster Registry, or OCR) to maintain cluster information for total nodes. These two entities are normally configured on raw devices. However, if you are using a clustered volume manager and/or file system as a piece of an external clustering suite, there are inescapable benefits to configuring CRS to employ a file system to store them. The main capitalize is that, unlike raw devices, file systems can breathe composed of an underlying structure that has software, hardware, and I/O path redundancy. The other capitalize is that manipulating records for taking backups or creating multiple copies is much easier.
Service names and CRS-Oracle introduced the concept of service names in 9i that allow you to add a layer of software virtualization over the traditional database instance. There are a variety of benefits to using service names, including dynamic load balancing and transfer between nodes, rational segregation of database traffic based on organizational or application needs, and the skill to provide application-transparent resource pooling.
In 10g RAC, Oracle introduced the requirement that dynamic management of service names require that the database breathe registered to or with CRS. CRS then is ultimately answerable for online, offline, and fail-over, and monitoring of total databases objects (such as database instances, listeners, virtual IP addresses and, of course, service names)-very similar to how a third-party cluster agent would function. This presents a problem with managing 10g RAC clusters using third-party cluster software:
You can Have either CRS or the third-party cluster agent managing databases objects, but not both. Also, once a database is “registered” with CRS, it is almost impossible to Have any other external component manage it.
A simple “meet-in-the-middle” approach that is recommended by vendors such as Symantec is to Have their products provide the lofty availability and performance infrastructure to manage CRS and then in spin let CRS manage total the database components. believe about it this way: You Have an application-CRS-that needs to breathe clustered, and you cluster it using a third-party cluster product. The primary handicap of this approach is that you are now complementing CRS in areas where its own capabilities are skimpy and creating a “best-of-both-worlds scenario.” The biggest disadvantage of this approach is cost: The main judgement why Oracle is bundling CRS and total other “goodies” in its database suite is to Have a “one-stop shop” for everything needed to manage the database, but whether they are really age and stable or not is a different story. Adding third-party cluster software adds cost.
Heartbeats and messaging-In the Oracle world, heartbeats are also known as “interconnects.” They are very similar to the heartbeats used by other clustering engines-a private and/or dedicated network that is exclusively used to retain total nodes in sync. CRS uses heartbeats for “cache fusion”-in other words, to ensure writes and reads performed by one node are known and acknowledged by total the other nodes-primarily to prevent data corruption.
There is one major shortcoming, however: In release 1 of 10g there was no facility to provide lofty availability for heartbeats using either multiple IP or network interfaces or providing a network interface fail-over mechanism (like Solaris IP Multipathing or Veritas MultiNIC). As a result, if you are implementing a absolute RAC, you Have to depend on the operating system to provide this kind of lofty availability. If you exigency to aggregate ports (as with Solaris Trunking or HP-UX APA) you may incur additional licensing costs.
By default, Oracle uses the UDP protocol for messaging. Some clustering software, such as Sun Cluster and Veritas SFRAC, provides libraries that allow you to supersede UDP with their proprietary protocols for this purpose. There is a lot of debate as to whether these are more stable than UDP. Oracle recommends against replacing UDP, but the company supports both configurations. Veritas SFRAC also provides special agents to monitor the heartbeat interfaces using its own messaging protocols to add an additional layer of protection.
Port aggregation-The limitations posed by CRS with respect to network lofty availability or port aggregation apply to virtual IP addresses as well. CRS handles fail-over of the virtual IP addresses between nodes, but assumes no responsibility for providing local lofty availability for any network failure. If you Have a node that is well configured, there should breathe no judgement to fail an entire database instance over for a single network failure. Therefore, it is absolutely necessary to provide network lofty availability using methods described above.
Replication-If you are planning to replicate your RAC environment for disaster-recovery purposes, breathe alert that Oracle’s vehicle of selection for this is Data Guard. If you Have already invested in another replication product, such as EMC’s SRDF or something similar, you may Have to integrate it yourself or employ third-party cluster agents because Oracle does not provide integration tools.
Data Guard in 10g has some worthwhile improvements over previous versions and deserves evaluation. However, your selection of which replication product to employ will largely depend on whether you are planning to replicate just the 10g cluster or a lot of non-Oracle applications, because Data Guard only works with Oracle.
In conclusion, Oracle 10g is a respectable suite with total the necessary pieces to accept RAC configured “out of the box.” However, some of the newer components such as CRS, ASM, etc., are quiet relatively novel and may require a few revisions to create them really robust. For now, it may create sense to proceed with a hybrid approach using best-of-breed technologies from various vendors, including Oracle, for what they carryout best.
Ashish Nadkarni is a senior consultant with GlassHouse Technologies (www.glasshouse.com).
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