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Re: [Networker] 45M iNode FS backup?
2011-05-11 08:13:45
On 05/10/11 23:06, jee wrote:
On Tuesday 10 May 2011 18:52:48 Yaron Zabary wrote:
I think that any contemporary major backup software should be able to
realize that the file system it is backing up is large (actually this
should be done for each directory)
This is not about the size of the backup system. It is about the amount of
files that are on that file sysem and have to e opened individually during
backups (ultimately by the OS, not networker ).
I know. This is the usual file system traversal problem with many
files per directory.
Snapimage is a practical solution for that. It does block-level backups and
avoids the too many system calls that would be required, during file-level
backups, to open and read each file that is to be backed up.
SnapImage need to be able to read the block device and understand the
file system. This means that SnapImage will be able to support only
certain file systems, so it might be able to backup ext3 but not ext4.
Also, some file systems, such as ZFS will not expose a block device
which it can work with.
jee
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--
-- Yaron.
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