Avrdude software. Can you explain the steps to Mirroring rootvg in your environment?Mirroring “rootvg” protects the operating system from a disk failure. Mirroring “rootvg” requires a couple extra steps compared to other volume groups.
The mirrored rootvg disk must be bootable.and. in the bootlist. Otherwise, if the primary disk fails, you’ll continue to run, but you won’t be able to reboot.In brief, the procedure to mirror rootvg on hdisk0 to hdisk1 is1. Add hdisk1 to rootvg: extendvg rootvg hdisk12. Mirror rootvg to hdisk1: mirrorvg rootvg hdisk1 (or smitty mirrorvg)3. Create boot images on hdisk1: bosboot -ad /dev/hdisk14.
Add hdisk1 to the bootlist:bootlist -m normal hdisk0 hdisk15. Reboot to disable quorum checking on rootvg. The mirrorvg turns off quorum by default, but the system needs to be rebooted for it to take effect.What is VPN and how it works?A VPN is a private network that uses a public network (usually the Internet) to connect remote sites or users together. Instead of using a dedicated, real-world connection such as leased line, a VPN uses “virtual” connections routed rough the Internet from the company’s private network to the remote site or employee.What is daemon?A daemon (pronounced DEE-muhn) is a program that runs continuously and exists for the purpose of handling periodic service requests that a computer system expects to receive.
The daemon program forwards the requests to other programs (or processes) as appropriate. Each server of pages on the Web has an HTTPD or Hypertext Transfer Protocol daemon that continually waits for requests to come in from Web clients and their users.There are several daemon in AIX environment, such as, sshd, inetd, and so on.Can you describe SAN in your own word?A storage area network (SAN) is a high-speed special-purpose network (or subnetwork) that interconnects different kinds of data storage devices with associated data servers on behalf of a larger network of users. Typically, a storage area network is part of the overall network of computing resources for an enterprise. A storage area network is usually clustered in close proximity to other computing resources such as IBM Power5 boxes but may also extend to remote locations for backup and archival storage, using wide area network carrier technologies such as ATM or SONET.A storage area network can use existing communication technology such as IBM’s optical fiber ESCON or it may use the newer Fibre Channel technology. Some SAN system integrators liken it to the common storage bus (flow of data) in a personal computer that is shared by different kinds of storage devices such as a hard disk or a CD-ROM player.SANs support disk mirroring, backup and restore, archival and retrieval of archived data, data migration from one storage device to another, and the sharing of data among different servers in a network.
SANs can incorporate subnetworks with network-attached storage (NAS) systems.So you mention NAS, but What is NAS?Network-attached storage (NAS) is hard disk storage that is set up with its own network address rather than being attached to the department computer that is serving applications to a network’s workstation users. By removing storage access and its management from the department server, both application programming and files can be served faster because they are not competing for the same processor resources. The network-attached storage device is attached to a local area network (typically, an Ethernet network) and assigned an IP address.
File requests are mapped by the main server to the NAS file server.Network-attached storage consists of hard disk storage, including multi-disk RAID systems, and software for configuring and mapping file locations to the network-attached device. Network-attached storage can be a step toward and included as part of a more sophisticated storage system known as a storage area network (SAN).NAS software can usually handle a number of network protocols, including Microsoft’s Internetwork Packet Exchange and NetBEUI, Novell’s Netware Internetwork Packet Exchange, and Sun Microsystems’ Network File System. Configuration, including the setting of user access priorities, is usually possible using a Web browser.What is SMTP and how it works?SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol used in sending and receiving e-mail. However, since it is limited in its ability to queue messages at the receiving end, it is usually used with one of two other protocols, POP3 or IMAP, that let the user save messages in a server mailbox and download them periodically from the server.
In other words, users typically use a program that uses SMTP for sending e-mail and either POP3 or IMAP for receiving e-mail. On Unix-based systems, sendmail is the most widely-used SMTP server for e-mail. A commercial package, Sendmail, includes a POP3 server. Microsoft Exchange includes an SMTP server and can also be set up to include POP3 support.SMTP usually is implemented to operate over Internet port 25.Do you have any idea about NAT?Short for Network Address Translation, an Internet standard that enables a local-area network (LAN) to use one set of IP addresses for internal traffic and a second set of addresses for external traffic.
A NAT box located where the LAN meets the Internet makes all necessary IP address translations.NAT serves three main purposes: Provides a type of firewall by hiding internal IP addresses Enables a company to use more internal IP addresses. Since they’re used internally only, there’s no possibility of conflict with IP addresses used by other companies and organizations.
Allows a company to combine multiple ISDN connections into a single Internet connection.Explain DHCP and its uses to an environment?Short for Dynamic Host Configuration Protocol, a protocol for assigning dynamic IP addresses to devices on a network. With dynamic addressing, a device can have a different IP address every time it connects to the network. In some systems, the device’s IP address can even change while it is still connected. DHCP also supports a mix of static and dynamic IP addresses.Dynamic addressing simplifies network administration because the software keeps track of IP addresses rather than requiring an administrator to manage the task. This means that a new computer can be added to a network without the hassle of manually assigning it a unique IP address. Many ISPs use dynamic IP addressing for dial-up users.What does SNMP stands for?Short for Simple Network Management Protocol, a set of protocols for managing complex networks. SNMP works by sending messages, called Protocol Data Units, to different parts of a network.
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SNMP-compliant devices, called Agents, store data about themselves in Management Information Bases and return this data to the SNMP requesters.What do you know about TCPDump?TCPdump is a common computer network debugging tool that runs under the command line. It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Tcpdump works on most Unix-like platforms: Linux, Solaris, BSD, Mac OS X, HP-UX and AIX among others. On Windows, WinDump can be used; it’s a port of tcpdump to Windows.You must have a root or super user authority to use TCPdumps in UNIX like envrionment.How do I remove a volume group with no disks?This is a very common question about AIX LVM and I knew that you will ask me this one. Within a volume group there is a Volume Group Descriptor Area (VGDA) which is kinda a “suitcase” of lvm information. This is what allows you to pick up your drives and take them to another machine, importvg them, and get filesystems automatically defined.What happens, when you importvg the volume group, the command goes out and reads the VGDA and finds out about all the logical volumes and filesystems that may exist on thevolume group. It then checks for clashes (name conflicts, etc.) on its own machine and then, populates its own database with information about the new volume group andits associated logical volumes.
In cases of file systems, it will go into the /etc/filesystems file and add the new filesystem entries that came along with the imported volume group.The main question I see is “I’ve taken away the disks, but how do I get rid of the volume group”. The question should really say, “How do I get rid of the volume group INFORMATION” since that’s all you have on the system.
You’ve got possible entries inthe /etc/filesystems and definitely entries in the ODM. Just do:exportvgIt does a reverse importvg, except it doesn’t go off and read the VGDA.
It nukes anything relating to the volume group in the /etc/filesystems and ODM. The only time this won’t work is if the system detects that the volume group is varied on. Then, it would be like trying to change tires on a moving car, we won’t let you do it!How do you you get rid of a disk that is no longer really in the VG?In this case, you DON’T want to do an exportvg. What you want to do is tell the system you want to cut out the memory of the old, bad disk from the RS/6000 AND from the VGDA of the volume group. You simply do: reducevg -d -for if the hdname can’t be found:reducevg -d -fBe careful with this command. Unlike the exportvg command, actions donewith this command WILL affect the VGDA information on the platter.What is Capacity on Demand?Capacity on Demand (CoD) encompasses the various capabilities for you to dynamically activate one or more resources on your server as your business peaks dictate. You can activate inactive processors or memory units that are already installed on your server on a temporary and permanent basis.Usually, the Capacity on Demand is used for IBM System i5™ and eServer™ i5 and IBM System p5™ and eServer p5 520, 550, 570, 590, and 595 models.
Some servers include a number of active and inactive resources. Active processors and active memory units are resources that are available for use on your server when it comes from the manufacturer. Inactive processors and inactive memory units are resources that are included with your server but are not available for use until you activate them.What is Hardware Management Console (HMC)?The HMC is a server or stand alone machine that provides a graphical user interface tool to manage several Power Systems. The HMC manages system through hypervisor and operating system.
From version 7 it is truly web based and you can configure, installs and manage, partitioned, virtualization most of your Power5 and 6 boxes via HMC. There are many tasks you can do with HMC, such as, Powering off and on of the partition Configure and activate resources to the system Creates and stores LPAR profiles and allocated resources to them. HMC do the dynamic memory reconfiguration of the partition.
Family 9115+01 IBM System p5 505 Entry ServerIBM U.S. Sales ManualRevised: October 04, 2005.DocumentoptionsType ModelAnnouncedAvailableMarketing WithdrawnService DiscontinuedReplaced By91/10/042005/10/14-The IBM 9115 System p5 505 entry server (9115-505) is a powerful,rack-dense two-way-capable system that delivers the expandability andavailability features required for data centers and small and medium sizebusinesses. The raw computing power of the server positions it well forinfrastructure applications such as file/print, Web serving, networking,systems management, and security. Its POWER5 processor is also ideallysuited for high-performance compute clusters. Application serveravailable in a rack or deskside form factor.Model Abstract 9115-505The IBM 9115 p5-505 server Model 505 gives you tools for serversmanaging business, greater application flexibility, and innovativetechnology - all designed to help you become an On Demand Business. Thep5-505 SMP includes a one-or two-way, 64-bit, copper-based POWER5microprocessor.
November 1st at 12:00amWe have some old IBM P5 series servers that run AIX 5.3 which we use for testing. They get powered down rarely, so we don't often have to go through a cold boot cycle.
Last week one of the machines was power cycled and would not respond to pings. The guy who normally handles this type of thing was unavailable, so I got to try my hand at restoring the old server to an operational state.Fortunately for me I was able to succeed.:) References. pic.dhe.ibm.com. oldapps.com. nmap.org. wireshark.orgCut to the ChaseWhile it was an adventure learning more about IBM servers and corresponding HMCs, I won't make you read the whole narrative to extract the pertinent technical information about P5 servers. Here are the details:P5 HMC Default Credentials:.
Username: admin. Password: admin. Username: general. Password: generalP5 HMC Default APIP Addresses & Serial Console Settings:. HMC Port 1: 169.254.2.147 with a subnet mask of 255.255.255.0.
HMC Port 2: 169.254.3.147 with a subnet mask of 255.255.255.0. Serial Port: 19200 8N1Steps to Boot or Reboot an IBM P5 into AIX:. Login to the HMC using serial connection (serial can be enabled via web UI, see instructions above). You may need to press a few keys (like Return) to start seeing anything. Enter the Power/Restart Control menu. Select Option 1 for 'Power On/off System.
Select Option 8 to start the boot process. Watch the text scroll across the serial connection. That's how you'll know if actions are proceeding. Press Enter when prompted. When given the option to boot into single user mode, take it.
When asked about leave single user mode, hit enter to go to the default run level (I think it goes to run level 2). Try to ping your host once it has booted. Try to SSH into the host, should be successfulThis may take around 10 to 15 minutes depending on how slow the box is feeling Exploration (Long Story)Coming from a strong background in Linux on generic x86 hardware, it took me a fair amount of time to become familiarized with old IBM hardware.
My initial google queries did not return much useful information, just that there is a serial console port which can be used to potentially get into single user mode.After connecting a USB - Serial adapter hooked up so I could plug in the 9-pin cable to the P5 I tried using a serial console emulator to connect. Unfortunately, this was not successful. I did not see any text roll across the screen as I had expected.After running into a wall using the serial port, I performed a few more optimized google queries and came up with some information about the Hardware Management Controller (HMC) that is installed on these servers.Apparently there is a web console which can be accessed once an ethernet cable is plugged into one of the HMC ethernet ports.I plugged in an ethernet cable between my laptop and the server and tried to use NMAP to scan the whole 169.254.x.x range to find out what APIP address the server had assigned to itself. After waiting a few minutes I realized just how long that would take and aborted the open ended scan. I enabled WIndows Internet Connection Sharing (ICS), rebooted the server and monitored the DHCP requests using WireShark.Once I had identified the P5's IP address (assigned via ICS DHCP server) I fired up nmap to do a port scan against the host. There were 2 open ports: 30000 and 443. The documentation I had found suggested that all I had to do was enter the IP addres of the mahine in the web browser and the web console would load.
I tried that and received the following error when using Firefox: sslerrornocypheroverlapApparently the versions of Chrome, IE and FireFox that I tried were all too new to communicate with this old server's SSL stack. I had to download a copy of FireFox 1.5 which could speak the same language as the P5 in order to access the web console.Once the web console loaded I ran into another problem: the dreaded username and password prompt. Fortunately for me we have this information documented. In case anyone who reads this does not know their username or password to access the HMC, here are the defaults:. Username: admin. Password: admin. Username: general.
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Password: generalAfter gaining access to the web UI I messed around with a few options and read the serial port configuration. Apparently my serial console was using the wrong settings. I needed to set the serial connection to 19200 8N1 instead of the 9600 that I had been trying.Now that I had gained access to the serial console, I was able to boot the box. Apparently booting the HMC is different than booting the box itself.
Ibm P5 590
Hi,We got a new Ibm P5 Series server with a HMC console, whenit boots we have codes beginning with C displayed on the operatorpanel after that it looks like normal initialisation (01 N V=F, HMC=0 T),but nothing is displayed on the HMC, nothing is displayed on an Asciiconsole that we added on the first serial port.What can be the problem?ThanksRegardsBandonEnvoyez avec Yahoo! Une boite mail plus intelligente http://mail.yahoo.fr.
I'm not sure why you don't see any display on the HMC if you config'd the system on it. Which you must do first before booting the new system for the first time. You didn't specify whether you had config'd the system to the HMC first or not. If you didn't you'll have to remove it from the HMC and basically start over.If my memory serves me you also can't put a ASCII console on the first serial port. It has to be the second or third port. Some p5 systems don't allow an ASCII console at all so you need to check your model against what IBM has posted.You didn't say what model p5.
Ibm System P5 Serial Connection
Go check it out at the support site.Hope that helps. Once you get rolling with your P5 should you need more systems or helpupgrading existing systems keep us in mind. We can offer you some techsupport on situations like this.Best Regards,Raymond R. ZawackiChairman of Elarasys Inc.Great used IBM pSeries xSeries FastT Sun Cisco and more!!!Elarasys Inc. Www.Elarasys.comPhone 847-468-8900Fax 847-468-0100Cell 847-951-6400AOL IM RISC6000.Get fantasy football with free live scoring. Sign up forFanHouse Fantasy Football today.(http://www.fanhouse.com/fantasyaffair?ncid=aolspr0020).
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