Drivers Acronis



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Description of the Acronis SnapAPI module

Description

The SnapAPI module is in charge of all Acronis software I/O operations on the hard disk. It also allows to create backups under running Windows with an unlimited number of files open for reading and writing without the necessity to reboot the computer.

Once Acronis software initializes the backup process of a volume (a single partition or a dynamic disk), Acronis Snapshot Manager flushes the file system mounted to that volume temporarily freezing all the operations on the system volume. Immediately thereafter, the Snapshot Manager driver creates a point-in-time view of the system volume and a bitmap describing the used sectors on this volume. Once the bitmap is created, the filter driver unfreezes the I/O operations on the system volume. It generally takes just several seconds to create a point-in-time view of the volume. After that, the operating system continues working as the imaging process is under way.

Acronis software reads the sectors on the system volume according to the created bitmap. Once a sector is read, the appropriate bit in the bitmap is reset. In its turn, the Acronis driver continues working to hold the point-in-time view of the system volume. Whenever the driver sees a write operation directed at the system volume, it checks whether these sectors are already backed-up, if they are not, the driver saves the data on the sectors that will be overwritten to a special buffer created by the software, then it allows the sectors to be overwritten. Acronis software backs up the sectors from the special buffer, so that all the sectors of the point-in-time view of the system volume will be backed up intact. Meanwhile, the operating system continues working and you will not notice anything unusual in the operating system functionality.

The Snapshot Manager driver (snapman.sys) is installed as an upper filter between the file system drivers and the volume drivers, so SnapAPI can intercept all the read and write requests passing to a partition. See the scheme below:

Physical hard disk drive
↓
Hard disk driver (disk.sys) which enumerates the hard disk drives, reads and writes information
↓
Hard disk partitions driver (partmgr.sys), which enumerates the hard disk partitions
↓
Volume driver (ftdisk.sys) which represents the partition as a volume. If there are dynamic disks in the system, the information about them is provided to ftdisk.sys by dmio.sys, which works with the physical hard disks through disk.sys
↓
Acronis driver (snapman.sys) which flushes the file system mounted to the volume being read by the Acronis application, so all the operations on the volume temporarily freeze. It generally takes just a few seconds and then the operating system continues working as usual
↓
File system driver (fastfat.sys, ntfs.sys), which represents the volume according to the file systems specifications

Acronis Drivers For Universal Restore

The SnapAPI drivers binary files and registry keys/settings are listed below:

  • HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicessnapman
  • HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E967-E325-11CE-BFC1-08002BE10318} -> snapman or fltsrv string in the UpperFilters value
  • HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{71A27CDD-812A-11D0-BEC7-08002BE2092F} -> snapman or fltsrv string in the LowerFilters value
  • Windowssystem32driverssnapman.sys
Drivers

For compatibility purposes SnapAPI may also be present in Windowssystem32snapapi.dll

Add drivers acronis boot cd

More information

You can also take a look at the graphical representation of how Acronis Snapshot Manager works:

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Add Drivers Acronis Boot Cd

Scenario

  1. You boot your machine from Acronis Bootable Media;
  2. Acronis Bootable Media does not detect the machine's hard disk, RAID or network interface (NIC).

Cause

Acronis

The most likely reason is that the Acronis Bootable Media does not have drivers for the respective hardware, or there is hardware malfunction/specifics due to which Acronis modules can't get access to the device.

Solution 1

Сheck whether the issue can be reproduced with a media created with the latest build of your Acronis software.

Solution 2

There is no possibility to add drivers to regular Acronis Bootable Media (based on Linux) on the fly.

As a workaround, you can use Windows-based Bootable Media (WinPE/WinRE) - see Acronis Bootable Media Types. It uses Windows-based drivers which can be requested from the respective hardware vendor and embedded into WinPE-based media manually.

Adding Drivers Acronis Universal Restore

For Acronis Cyber Protect see Acronis Cyber Protect Cloud: how to create a WinPE-based bootable media

Drivers Acronis App

Solution 3, for Acronis Cyber Backup (Advanced) only

Acronis Drivers

A custom bootable media can be created for Acronis Cyber Backup (Advanced). Each case is to be investigated separately to determine the exact root cause and see if it is possible to implement the respective hardware support. The following information is needed to investigate the problem:

  1. Collect a system report from the Acronis Bootable Media as described in Acronis Linux Report, but be sure to use the latest one - see Downloading Acronis Bootable Media; if the hardware is malfunctioning after some steps performed from Acronis Bootable Media, make sure to reproduce the issue first - and only then get the system report output (make sure not to reboot the machine before getting the report);
  2. Collect a system report from Windows as described in AcronisInfo Utility;
  3. Describe the details of the problem hardware (computer brand/model, motherboard model, NIC model, disk/RAID controller model, RAID level, etc.) - you can contact the hardware vendor for additional information if needed;
  4. Contact Acronis Customer Central with the two system report files and above data and a reference to this article.

More information

You may also want to check the known issues:

Acronis drivers

If you need assistance from Acronis support, please collect the following information and contact us:

  • System report under the latest bootable media
  • System report from live operating system, if possible.
  • Photos or video capturing the issue, if possible.

See Acronis system report.

See also:

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