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High availability for DPM 2012 RRS feed

  • Question


  • Sir,

    Here is my questions for dpm hiavailability.

    How should i address the hi-availability for below scenario.

    The customer requirement is as follows.

    In head office there are about 2 Domain controllers.

    Mail Box server 02

    Client access server 02

    DAG

    SQL = 01 server

    SAN

    They are planning to use DPM 2012 as a back solution for the above requirement. also the following server are placed in the disaster recovery site.

    Domain controller

    Exchange server

    Backup Server.

    As per my understating there are 2 DPM servers needed to be placed in the head and the DR site.

    What are the best practices for backing servers for DR sites, and what are recommended storage device for the above requirement.

    Thank you

    Mahesh


    Wednesday, October 31, 2012 11:10 AM

Answers

  • that would be :

    Datasize * 52 (number of weeks per year) * 5

    • Marked as answer by msactive Thursday, November 15, 2012 10:28 AM
    Tuesday, November 13, 2012 7:44 PM
  • Tape won't get the Recovery Points but only the replica.

    That means that if your SQL data is 12TB then you'll have approx 15TB each time on the tape.

    15TB * 52 (weeks) * 5 (years) = 3900 TB

    • Marked as answer by msactive Thursday, November 15, 2012 10:23 AM
    Wednesday, November 14, 2012 9:16 AM
  • This will apply to all type of data as DPM will backup the entire data on tape each time.


    260 and 3600 are the correct numbers

    • Marked as answer by msactive Thursday, November 15, 2012 10:22 AM
    Wednesday, November 14, 2012 1:06 PM

All replies

  • Hi,

    You can configure 1 DPM @ Primary Site which backup those data to disk. Then setup another DPM @ DR Site to replicate changes from Primary DPM Server. This is called DPM 2 DPM 4 DR configuration. (Option 1)

    This will provide redundancy of data and able to restore at DR Site.

    Option 2-Another scenario is 1 DPM backup primary site & another DPM backup at DR Site. On Primary site, you can configure backup to tape and bring the tape to DR site for recovery but this a bit manual and tedious process.

    It really depend on how the setup for DC & Exchange. Most of the time, DC is setup as Additional domain controller and has replicate from primary site. Then Exchange using DAG replication.

    The most important is primary site backup AD system state and Exchange database. And use Option 1, to replicate to DR Site



    Lai (My blog:- http://www.ms4u.info)

    Tuesday, November 6, 2012 8:38 AM
  • Dear Sir,


    Thank you very much for your information.. I would like to use option 1 as you said.. thanks.. also i would like to clarify the storage calculation scenario because I'm bit confuse about the retention.

    As per the Microsoft best practices the storage equation for sql and the exchange is as follows.  

    • Exchange storage group: daily express full backup and 15-minute incremental synchronization with a retention range of 5 days. (5 Snap shots)
    • SQL Server database: 2 express full backups daily with a retention range of 14 days. (28 Snap Shots)

    Replica Volume

    For SQL Server data:

    Data source size x (1 + log change) / (alert threshold - .05)

    100GB x (1 + 6%) / (90% - .05)

    For Exchange data:

    Data source size x (1 + log change) / (alert threshold - .05)

     

    Recovery point volume

    For SQL Server data:

    2.5 x retention range in days x log change x data source size + 1600 MB

    For Exchange data:

    4.0 x retention range in days x log change x data source size + 1600 MB

    My questions are as follows.

    Ex : SQL calculation

    Replica volume

    Data source size x (1 + log change) / (alert threshold - .05)

    100GB x (1 + 6%) / (90% - .05)

    =15.43TB

    Recovery Point

    For SQL Server data:

    2.5 x retention range in days x log change x data source size + 1600 MB

    2.5x14x6%x 12974457.6MB +1600

    =25.98TB

    The above calculation part we calculated for short term backup. (To disk back up scenario).

    What i want to know is

    When it comes to the Long term back up,(Tape scenario)

    Do we have to use the same equation for the storage calculation as above?  and How can i define the full backup for the long term.. please use the example and explain briefly for tape scenario.

    Thank you

    Mahesh Leema 


    Tuesday, November 13, 2012 12:02 PM
  • Hi,

    the short term calculation seems to be wrong as you don't use the same data source size. But let's take 12TB as size then your number seems to be ok.

    for long term backup to tape, the calculation is easier.
    Each tape backup will be based on the last full express and will contain all the data.

    Which means that if you perform 1 backup each week then your tape will contain all the data (approx 15TB)

    Tuesday, November 13, 2012 1:50 PM
  • Hello,

    Thank you very much for your advice, for further clarification, how does it calculate for 5 years retention using the same data source. (12TB) please share with me a equation.

    full backup perform 1week + 5 years retention.

    Thank you

    Mahesh

    Tuesday, November 13, 2012 7:18 PM
  • that would be :

    Datasize * 52 (number of weeks per year) * 5

    • Marked as answer by msactive Thursday, November 15, 2012 10:28 AM
    Tuesday, November 13, 2012 7:44 PM
  • Assume as 12TB for sql data

    12Tb converted to MB = 12582912MB

    Calculation is as follows

    Replica volume

    Data source size x (1 + log change) / (alert threshold - .05)

    12582912MB x (1 + 6%) / (90% - .05)

    =14.96TB

    Recovery Point

    For SQL Server data:

    2.5 x retention range in days x log change(6%) x data source size + 1600 MB

    2.5 x Datasize * 52 (number of weeks per year) * 5 (is this correct)

    bit confuse about the recovery point.  how does it apply the above equation to the recovery point.

    Thak you

    Mahesh

    Wednesday, November 14, 2012 4:07 AM
  • Tape won't get the Recovery Points but only the replica.

    That means that if your SQL data is 12TB then you'll have approx 15TB each time on the tape.

    15TB * 52 (weeks) * 5 (years) = 3900 TB

    • Marked as answer by msactive Thursday, November 15, 2012 10:23 AM
    Wednesday, November 14, 2012 9:16 AM
  • I'm really appreciate your great answer. Also i would like to get the answer for my final question.

    As per the below equation the total number of full backups would be 52 * 5 = 260 (correct me if im wrong) ?

    15TB * 52 (weeks) * 5 (years) = 3900 TB

    Does this applied for SQL/Exchnage/Sharepoint Ect ?

    Thank you

    Mahesh

    • Marked as answer by msactive Thursday, November 15, 2012 10:23 AM
    • Unmarked as answer by msactive Thursday, November 15, 2012 10:28 AM
    Wednesday, November 14, 2012 11:29 AM
  • This will apply to all type of data as DPM will backup the entire data on tape each time.


    260 and 3600 are the correct numbers

    • Marked as answer by msactive Thursday, November 15, 2012 10:22 AM
    Wednesday, November 14, 2012 1:06 PM