Home > Articles > Operating Systems, Server > Solaris

  • Print
  • + Share This
Like this article? We recommend

Example 1: Logical Device With SVM

To illustrate what has been presented, this section describes a method to access a replicated set of data, created using an enterprise class subsystem: the StorEdge SE99x0 systems. ShadowImage is used to replicate the LUNs. The data to access is configured as a metadevice using SVM patched at the latest level. The primary metadevice is called d101 and is a soft partition created on top of metadevice d100: RAID-0 of four SE99x0 LUNs. All of these metadevices are part of the metaset labset.

In this example, the primary and secondary volumes (metadevices) are accessed from two different hosts (the primary host is storage10 and the secondary host is storage26). In this situation, the primary host has access to the primary LUNs only, and secondary host sees only the secondary LUNs. This constraint forces you to reconstruct the metaset and metadevices on the secondary site before accessing the data. There is no possibility of importing or exporting the metaset from one host to the other (take and release ownership of a metaset implies that every disk is visible on both hosts).

SVM metaset

labset

SVM metadevice

d100, RAID 0 of 4 LUNs

d101, softpartition on top of d100

Primary disks:

LUNS visible from storage103

c8t500060E8000000000000ED1600000200d0

c8t500060E8000000000000ED1600000201d0

c8t500060E8000000000000ED1600000202d0

c8t500060E8000000000000ED1600000203d0

Secondary disks:

LUNS visible from storage26

c3t500060E8000000000000ED160000020Ad0

c3t500060E8000000000000ED160000020Bd0

c3t500060E8000000000000ED160000020Cd0

c3t500060E8000000000000ED160000020Dd0


ShadowImage is set up so that LUNs are paired, under the consistency group LAB, as follows:

Primary Disk -->

Secondary Disk

c8t500060E8000000000000ED1600000200d0 -->

c3t500060E8000000000000ED160000020Ad0

c8t500060E8000000000000ED1600000201d0 -->

c3t500060E8000000000000ED160000020Bd0

c8t500060E8000000000000ED1600000202d0 -->

c3t500060E8000000000000ED160000020Cd0

c8t500060E8000000000000ED1600000203d0 -->

c3t500060E8000000000000ED160000020Dd0


As described in the previous section, to access the replicated data, you must insure that every layer of the I/O stack is correctly set up. In this example, the steps would be divided as follows:.

  • Physical layer—ensure the replicated disks are consistent and accessible.

  • Driver layer—detect the replicated disks.

  • LVM Layer—reconstruct the replicated metasets and metadevices.

  • File system layer—make the replicated file system consistent.

  • Application layer—make the data ready for the application.

To Ensure Consistent and Accessible Replicated Disks in the Physical Layer

  • Suspend the replication:

  • Before accessing the replicated LUNs, stop (suspend) the replication and make sure every LUN is in a suspended (psus) state:

    root@storage103 # pairsplit -g LAB 
    root@storage103 # pairevtwait -g LAB -s psus -t 1800

    Of course, pairspli must be issued when all the LUNs are already synchronized (state PAIR). Failing to do so will result in corrupted secondary devices

To Detect the Replicated Disks in the Driver Layer

  • Scan the disks and verify that they are all visible and accessible from the secondary host.

  • This is achieved using the Solaris OS command devfsadm, which scans I/O buses for new devices and reads the partition table of each disk:

    root@storage26 # devfsadm 

To Reconstruct the Replicated Metasets and Metadevices in the LVM Layer

Modify the primary metaset configuration to reflect the new devices, and apply the modified configuration to a newly created metaset.

  1. Create a metaset on secondary host:

  2. root@storage26 # metaset -s labset -a -h storage26 
  3. Populate the new metaset with cloned disks:

  4. root@storage26 # metaset -s labset -a \ 
    c3t500060E8000000000000ED160000020Ad0\ 
    c3t500060E8000000000000ED160000020Bd0 \ 
    c3t500060E8000000000000ED160000020Cd0 \ 
    c3t500060E8000000000000ED160000020Dd0 \ 
  5. Create new configuration for the secondary metaset.

  6. Start by obtaining the metadevice configuration of the primary host:

    root@storage103 # metaset -s labset -p 
    labset/d101 -p labset/d100 -o 1 -b 10485760 
    labset/d100 1 4 c8t500060E8000000000000ED1600000200d0s0 \ 
    c8t500060E8000000000000ED1600000201d0s0 \ 
    c8t500060E8000000000000ED1600000202d0s0 \ 
    c8t500060E8000000000000ED1600000203d0s0 -i 32b 
  7. On the secondary host, create a metadevice configuration file called /etc/lvm/md.tab containing the previous output with the correct secondary LUNs.

  8. The order of appearance must be respected:

    root@storage26 # cat /etc/lvm/md.tab
    labset/d101 -p labset/d100 -o 1 -b 10485760
    labset/d100 1 4 c3t500060E8000000000000ED160000020Ad0s0 \ 
    c3t500060E8000000000000ED160000020Bd0s0 \ 
    c3t500060E8000000000000ED160000020Cd0s0 \ 
    c3t500060E8000000000000ED160000020Dd0s0 -i 32b 
  9. Apply the metadevice configuration file to the replicated host:

  10. root@storage26 # metainit -s labset -a
    labset/d100: Concat/Stripe is setup
    labset/d101: Soft Partition is setup
    root@storage26 #

To Make the Replicated File System Consistent in the File System Layer

  1. Check the consistency of the file system:

  2. root@storage26 # fsck /dev/md/labset/rdsk/d101 

    The fsck lists the corrupted files. Action must be taken to recover them. This operation makes sense in case of a crash. During a crash, some files might be corrupted (files in creation and modification mode).

  3. Mount the file system:

  4. root@storage26 # mount /dev/md/labset/dsk/d101 /mnt/LAB 

To Make the Data Ready for the Application in the Application Layer

At this stage, you can consider the replicated data accessible. Some application specific actions might take place, such as modifying configuration files, links, or other clean up and recover processes.

  • + Share This
  • 🔖 Save To Your Account

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.

Overview


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information


To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information


Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children


This site is not directed to children under the age of 13.

Marketing


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information


If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information


Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents


California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure


Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact


Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020