DPM 2007 -- Calculating Disk Allocation

Published Feb 14 2019 08:15 PM 57 Views
First published on TECHNET on Mar 27, 2008

When you create a new Protection Group using the “Create Protection Group” wizard, DPM internally computes and allocates volumes for storing the replica and the shadow copies. This blog post enumerates the various formulae that we use internally to generate the default size.


File system datasource


SC size = (dataSourceSize * recoveryRangeInDays * 2) / 100 + 1 GB;


Replica size = (dataSourceSize * 3) / 2;



SQL DB


Replica size = dataSourceSize * (1 + LogChange) / (AlertThreshold - .05);


SC size = 2.5 * recoveryRangeInDays * LogChange * dataSourceSize + 1 GB



Exchange SG


replicasize = dataSourceSize * (1 + LogChange) / (AlertThreshold - .05);


SCSize = 4.0 * recoveryRangeInDays * LogChange * dataSourceSize + 1GB



where


Log change = 0.06


Alertthreshold = 0.9



- Mukul Singh Shekawat


%3CLINGO-SUB%20id%3D%22lingo-sub-340380%22%20slang%3D%22en-US%22%3EDPM%202007%20--%20Calculating%20Disk%20Allocation%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-340380%22%20slang%3D%22en-US%22%3E%0A%20%26lt%3Bmeta%20http-equiv%3D%22Content-Type%22%20content%3D%22text%2Fhtml%3B%20charset%3DUTF-8%22%20%2F%26gt%3B%3CSTRONG%3E%20First%20published%20on%20TECHNET%20on%20Mar%2027%2C%202008%20%3C%2FSTRONG%3E%20%3CBR%20%2F%3E%3CP%3EWhen%20you%20create%20a%20new%20Protection%20Group%20using%20the%20%E2%80%9CCreate%20Protection%20Group%E2%80%9D%20wizard%2C%20DPM%20internally%20computes%20and%20allocates%20volumes%20for%20storing%20the%20replica%20and%20the%20shadow%20copies.%20This%20blog%20post%20enumerates%20the%20various%20formulae%20that%20we%20use%20internally%20to%20generate%20the%20default%20size.%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3E%3CB%3E%20File%20system%20datasource%20%3C%2FB%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3ESC%20size%20%3D%20(dataSourceSize%20*%20recoveryRangeInDays%20*%202)%20%2F%20100%20%2B%201%20GB%3B%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3EReplica%20size%20%3D%20(dataSourceSize%20*%203)%20%2F%202%3B%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3E%3CB%3E%20SQL%20DB%20%3C%2FB%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3EReplica%20size%20%3D%20dataSourceSize%20*%20(1%20%2B%20LogChange)%20%2F%20(AlertThreshold%20-%20.05)%3B%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3ESC%20size%20%3D%202.5%20*%20recoveryRangeInDays%20*%20LogChange%20*%20dataSourceSize%20%2B%201%20GB%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3E%3CB%3E%20Exchange%20SG%20%3C%2FB%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3Ereplicasize%20%3D%20dataSourceSize%20*%20(1%20%2B%20LogChange)%20%2F%20(AlertThreshold%20-%20.05)%3B%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3ESCSize%20%3D%204.0%20*%20recoveryRangeInDays%20*%20LogChange%20*%20dataSourceSize%20%2B%201GB%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3Ewhere%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3ELog%20change%20%3D%200.06%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3EAlertthreshold%20%3D%200.9%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E-%20%3CA%20href%3D%22http%3A%2F%2Fblogs.technet.com%2Fdpm%2Fpages%2Fmukul-singh-shekhawat-s-bio.aspx%22%20mce_href%3D%22http%3A%2F%2Fblogs.technet.com%2Fdpm%2Fpages%2Fmukul-singh-shekhawat-s-bio.aspx%22%20target%3D%22_blank%22%20rel%3D%22nofollow%20noopener%20noreferrer%22%3E%20Mukul%20Singh%20Shekawat%20%3C%2FA%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%0A%20%20%3CP%3E%3C%2FP%3E%3CBR%20%2F%3E%3C%2FLINGO-BODY%3E%3CLINGO-TEASER%20id%3D%22lingo-teaser-340380%22%20slang%3D%22en-US%22%3EFirst%20published%20on%20TECHNET%20on%20Mar%2027%2C%202008%20When%20you%20create%20a%20new%20Protection%20Group%20using%20the%20%E2%80%9CCreate%20Protection%20Group%E2%80%9D%20wizard%2C%20DPM%20internally%20computes%20and%20allocates%20volumes%20for%20storing%20the%20replica%20and%20the%20shadow%20copies.%3C%2FLINGO-TEASER%3E%3CLINGO-LABS%20id%3D%22lingo-labs-340380%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3ESystem%20Center%20Data%20Protection%20Manager%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
Version history
Last update:
‎Mar 11 2019 08:01 AM
Updated by: