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Date: Wed, 30 Sep 2009 18:25:33 -0700
From: Andrew Sharp <andy.sharp@lsi.com>
To: "Limato, Dave" <Dave.Limato@lsi.com>
Cc: Larry Scheer <larry.scheer@lsi.com>, "Currin, Shawn"
 <Shawn.Currin@lsi.com>, Jobi Ariyamannil <Jobi.Ariyamannil@lsi.com>
Subject: Re: md backups
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On Wed, 30 Sep 2009 19:12:24 -0600 "Limato, Dave" <Dave.Limato@lsi.com>
wrote:

> Here is whats on mightydog. Several of the volumes are not online or
> a mirror so not sure if they need to be backed up. Its managing
> around 32 TB of data. Name    Status  Type    Current (MiB)
> HardQuota (MiB) Used (MiB)      Avail (MiB)     Usage   VirtualServer
> nx-d_buildup_o  ld  NotMount    ed  Stan        dard  0.00      No
> Limit        0       0       0       %  BUILD m_home  Mounted Mirror
> 4372579.25      31457280           4,169,611.24
> 202,968.01  95.36%  MIGHTYDOG s_home_old      NotMounted
> Standard        0       No Limit
> -                     -      0.00%   MIGHTYDOG s_home  Mounted
> Standard        4372579.25      31457280
> 4,183,960.02             188,619.23  95.69%  MIGHTYDOG


These numbers are the total for the volume which would include snapshots
which could be as high as half the space.

For backup estimations, we need to get a reading of the usage of the
live view.  From that number there are algorithms for calculating how
much space is needed to do a backup scheme.