### SnapRAID Configuration - Linux Example

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Example configuration for SnapRAID on a Linux system, specifying parity file location, content file locations on different disks, and data disk mappings.

```config
parity /mnt/diskp/snapraid.parity
content /var/snapraid/snapraid.content
content /mnt/disk1/snapraid.content
content /mnt/disk2/snapraid.content
data d1 /mnt/disk1/
data d2 /mnt/disk2/
data d3 /mnt/disk3/
```

--------------------------------

### SnapRAID Configuration - Windows Example

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Example configuration for SnapRAID on a Windows system, using Windows path formats with drive letters and backslashes for parity, content, and data disk definitions.

```config
parity E:\snapraid.parity
content C:\snapraid\snapraid.content
content F:\array\snapraid.content
content G:\array\snapraid.content
data d1 F:\array\
data d2 G:\array\
data d3 H:\array\
```

--------------------------------

### Typical Unix SnapRAID Configuration

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

An example of a typical SnapRAID configuration file for Unix-like systems, including parity, content, data, exclude paths, and smartctl directives.

```config
parity /mnt/diskp/snapraid.parity
content /mnt/diskp/snapraid.content
content /var/snapraid/snapraid.content
data d1 /mnt/disk1/
data d2 /mnt/disk2/
data d3 /mnt/disk3/
exclude /lost+found/
exclude /tmp/
smartctl d1 -d sat %s
smartctl d2 -d usbjmicron %s
smartctl parity -d areca,1/1 /dev/sg0
smartctl 2-parity -d areca,2/1 /dev/sg0
```

--------------------------------

### Typical Windows SnapRAID Configuration

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

An example of a typical SnapRAID configuration file for Windows, including parity, content, data, exclude paths, and smartctl directives for Windows environments.

```config
parity E:\snapraid.parity
content E:\snapraid.content
content C:\snapraid\snapraid.content
data d1 G:\array\
data d2 H:\array\
data d3 I:\array\
exclude Thumbs.db
exclude $RECYCLE.BIN
exclude \System Volume Information
smartctl d1 -d sat %s
smartctl d2 -d usbjmicron %s
smartctl parity -d areca,1/1 /dev/arcmsr0
smartctl 2-parity -d areca,2/1 /dev/arcmsr0
```

--------------------------------

### Setup mhddfs Pool on Linux

Source: https://github.com/amadvance/snapraid/wiki/pooling

Creates mount points, mounts individual drives, and then pools them using mhddfs. Files are placed on the drive with the most free space.

```bash
sudo mkdir A00,A01,A02,pool
sudo mount /dev/sda1 A00
sudo mount /dev/sdb1 A01
sudo mount /dev/sdc1 A02
mhddfs mhddfs A00,A01,A02 Pool -o allow_other
```

--------------------------------

### SnapRAID Log Output Example

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This command demonstrates how to direct SnapRAID's structured log output to standard error.

```bash
snapraid status --log ">&2"
```

--------------------------------

### Setup AUFS Pool on Linux

Source: https://github.com/amadvance/snapraid/wiki/pooling

Creates mount points, mounts individual drives, and then pools them using AUFS. This method offers more control but is prone to issues with whiteout files on newer kernels.

```bash
sudo mkdir A00,A01,A02,pool
sudo mount /dev/sda1 A00
sudo mount /dev/sdb1 A01
sudo mount /dev/sdc1 A02
mount -t aufs -o br=A00=rw:A01=rw:A02=rw -o create=mfs none pool
```

--------------------------------

### Samba Configuration for SnapRAID Pool Share

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Example Samba configuration settings to enable sharing of the SnapRAID pool directory over the network, allowing access from Windows or Unix machines.

```ini
# In the global section of smb.conf
unix extensions = no

# In the share section of smb.conf
[pool]
comment = Pool
path = /pool
read only = yes
guest ok = yes
wide links = yes
follow symlinks = yes
```

--------------------------------

### Install AUFS tools on Linux

Source: https://github.com/amadvance/snapraid/wiki/pooling

Installs the AUFS (Another Unified File System) tools, a FUSE-based filesystem for pooling drives, on Debian-based Linux systems. Note: AUFS is not recommended for kernels 3.6 and above.

```bash
apt-get install aufs-tools
```

--------------------------------

### Calculate RAM Usage for SnapRAID Hashes

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Illustrates the formula and example calculations for estimating RAM requirements based on total disk size, block size, and hash size. Adjusting hash size and block size can reduce memory consumption.

```text
RAM = (8 * 4 * 10^12) * (1+16) / (256 * 2^10) = 1.93 GiB
RAM = (8 * 4 * 10^12) * (1+8) / (256 * 2^10) = 1.02 GiB
RAM = (8 * 4 * 10^12) * (1+16) / (512 * 2^10) = 0.96 GiB
RAM = (8 * 4 * 10^12) * (1+8) / (512 * 2^10) = 0.51 GiB
```

--------------------------------

### Install mhddfs on Linux

Source: https://github.com/amadvance/snapraid/wiki/pooling

Installs the mhddfs utility, a FUSE-based filesystem for pooling drives, on Debian-based Linux systems.

```bash
sudo apt-get install mhddfs
```

--------------------------------

### SnapRAID Scrub Command

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Starts the SnapRAID scrubbing process to check data and parity for errors. By default, it checks approximately 8% of the array, excluding recently scrubbed blocks.

```bash
snapraid scrub
```

--------------------------------

### SnapRAID Basic Commands Overview

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Overview of essential SnapRAID commands for managing the array, including status, disk control, backup, scrubbing, and fixing.

```bash
status
```

```bash
smart
```

```bash
probe
```

```bash
up
```

```bash
down
```

```bash
sync
```

```bash
scrub
```

```bash
fix
```

--------------------------------

### SnapRAID Command-Line Synopsis

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

This lists the available command-line options and subcommands for SnapRAID. Use these to configure and manage your backup and recovery operations.

```bash
snapraid [-c, --conf CONFIG]
	[-f, --filter PATTERN] [-d, --filter-disk NAME]
	[-m, --filter-missing] [-e, --filter-error]
	[-a, --audit-only] [-h, --pre-hash] [-i, --import DIR]
	[-p, --plan PERC|bad|new|full]
	[-o, --older-than DAYS] [-l, --log FILE]
	[-s, --spin-down-on-error] [-w, --bw-limit RATE]
	[-t, --tail]
	[-Z, --force-zero] [-E, --force-empty]
	[-U, --force-uuid] [-D, --force-device]
	[-N, --force-nocopy] [-F, --force-full]
	[-R, --force-realloc] [-W, --force-realloc-tail]
	[-S, --start BLKSTART] [-B, --count BLKCOUNT]
	[-L, --error-limit NUMBER]
	[-A, --stats]
	[-v, --verbose] [-q, --quiet]
	status|smart|probe|up|down|diff|sync|scrub|fix|check
	|list|dup|pool|devices|touch|rehash|locate

snapraid [-V, --version] [-H, --help] [-C, --gen-conf CONTENT]
```

--------------------------------

### SnapRAID Sync Command

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Initiates the SnapRAID synchronization process to build or update parity information. This command may take a long time on the first run.

```bash
snapraid sync
```

--------------------------------

### SnapRAID Operating Without Configuration Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag is output when SnapRAID is run without a configuration file.

```log
conf:missing:
```

--------------------------------

### SnapRAID Parity Disk Filesystem Info Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag provides filesystem information for a parity disk, including size and free space. For split parity, it's the sum of all splits.

```log
fsinfo_parity:<parity_level>:<size>:<free>
```

--------------------------------

### SnapRAID Parity Split Filesystem Info Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag provides detailed filesystem information for a parity split, including type and label.

```log
fsinfo_parity_split:<parity_level>[/<split_index>]:<size>:<free>:<type>:<label>
```

--------------------------------

### SnapRAID Data Disk Filesystem Info Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag provides filesystem information for a specified data disk, including size and free space.

```log
fsinfo_data:<disk_name>:<size>:<free>
```

--------------------------------

### Configure SnapRAID for Windows Network Shares

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Configure SnapRAID to share disks over a network in Windows. Ensure both pool and individual disk directories are shared, and specify the UNC path in the configuration.

```config
data d1 F:\array\
data d2 G:\array\
data d3 H:\array\
pool C:\pool
share \\darkstar
```

--------------------------------

### Set Maximum Disk Temperature Limit

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Configures the maximum allowed disk temperature in Celsius. SnapRAID will stop operations and spin down disks if this limit is exceeded, with a configurable sleep period before resuming.

```text
temp_limit TEMPERATURE_CELSIUS
```

--------------------------------

### SnapRAID Data Disk Split Filesystem Info Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag provides detailed filesystem information for a data disk split, including type and label.

```log
fsinfo_data_split:<disk_name>:<size>:<free>:<type>:<label>
```

--------------------------------

### SnapRAID Configuration File Path Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag indicates the path to the configuration file that SnapRAID is using. The path is escaped.

```log
conf:file:<path>
```

--------------------------------

### Define Pooling Directory

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Specifies the directory where SnapRAID's 'pool' command creates a virtual view of the disk array. This directory must already exist.

```text
pool DIR
```

--------------------------------

### SnapRAID Scrub Command with Options

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Customizes the SnapRAID scrub operation by specifying the percentage of the array to check (-p) and the minimum age of blocks to consider (-o).

```bash
snapraid -p 5 -o 20 scrub
```

--------------------------------

### SnapRAID Pool Configuration - Windows

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Configures the directory where SnapRAID will create a read-only virtual view of all files in the array using symbolic links on a Windows system.

```config
pool C:\pool
```

--------------------------------

### Reconfigure Failed Disk for Recovery

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Modify the SnapRAID configuration file to point a failed data or parity disk to a new location with sufficient free space for recovery.

```config
data d1 /mnt/new_spare_disk/
```

--------------------------------

### SnapRAID Parity File Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag defines a parity file, including its level, path, and filesystem UUID. Supports split parity.

```log
<parity_level>[/<split_index>]:<path>:<uuid>
```

--------------------------------

### SnapRAID Pool Configuration - Unix

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Configures the directory where SnapRAID will create a read-only virtual view of all files in the array using symbolic links on a Unix-like system.

```config
pool /pool
```

--------------------------------

### Custom smartctl Options for Disk Attributes

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Defines custom smartctl options to obtain SMART attributes for disks, useful for RAID controllers and some USB disks. The %s placeholder is replaced by the device name.

```config
smartctl parity -d sat %s
```

--------------------------------

### SnapRAID Status Command

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Displays the current status of the SnapRAID array, including information about errors found during scrubbing.

```bash
snapraid status
```

--------------------------------

### SnapRAID Data Disk Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag defines a data disk, including its name, directory, and filesystem UUID.

```log
data:<disk_name>:<dir>:<uuid>
```

--------------------------------

### SnapRAID Scrub Bad Blocks Command

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Optimizes the SnapRAID scrub process by focusing only on blocks that are currently marked as bad, making the error correction faster.

```bash
snapraid -p bad scrub
```

--------------------------------

### Run SnapRAID Fix for Disk Recovery

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Execute the 'snapraid fix' command to recover data for a specific disk, logging the process to an external file. Use multiple '-d' options for multiple failed disks.

```bash
snapraid -d NAME -l fix.log fix
```

--------------------------------

### Enable Remote Symlink Access on Windows Clients

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Configure Windows clients to allow access to remote symbolic links. This command enables various symlink evaluation modes.

```bash
fsutil behavior set SymlinkEvaluation L2L:1 R2R:1 L2R:1 R2L:1
```

--------------------------------

### Format Parity Partition for Extra Space (Linux)

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Use this command to format a parity partition with the 'largefile4' option, which results in approximately 1.5% extra space. This is useful for handling a larger number of files without wasted space.

```bash
mkfs.ext4 -m 0 -T largefile4 DEVICE
```

--------------------------------

### Check Recovered Disk with SnapRAID

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Perform a cautious check on a recovered disk using 'snapraid check' with '-d' and '-a' options to verify data integrity and ignore parity data.

```bash
snapraid -d NAME -a check
```

--------------------------------

### Retry SnapRAID Fix with Imported Files

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

If files were removed after the last sync and are not recovered, retry the 'snapraid fix' command using the '-i' option to include these files in the recovery process.

```bash
snapraid fix -i
```

--------------------------------

### SnapRAID Block Size Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag reports the configured block size in bytes.

```log
blocksize:<bytes>
```

--------------------------------

### Undelete All Missing Files with SnapRAID

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Execute 'snapraid fix -m' to recover all missing files across all drives in the array. This command restores all deleted files.

```bash
snapraid fix -m
```

--------------------------------

### Set Disk Standby Time After Temperature Limit

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Defines the duration in minutes that disks will remain spun down after reaching the temperature limit. The default value is 5 minutes.

```text
temp_sleep TIME_IN_MINUTES
```

--------------------------------

### SnapRAID Pool Command

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Generates or updates the read-only virtual view of the array's files in the configured 'pool' directory.

```bash
snapraid pool
```

--------------------------------

### Undelete Missing Files Only with SnapRAID

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Use the 'snapraid fix' command with '-m' and '-f' options to recover only missing files within a specified directory, leaving other files untouched.

```bash
snapraid fix -m -f DIR/
```

--------------------------------

### Define Remote UNC Path for Shared Access

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Sets the Windows UNC path for accessing disks remotely. Symbolic links in the pool directory will use this path, enabling network sharing of the pool directory.

```text
share UNC_DIR
```

--------------------------------

### SnapRAID RAID Mode Tag

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid_log.txt

This tag specifies the RAID mode being used and the maximum number of simultaneous disk failures it can withstand.

```log
mode:<raidname>
```

--------------------------------

### Ignore SMART Attribute on Specific Parity Disk

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Ignores a specified SMART attribute (e.g., attribute 197) only on the first parity disk. This helps manage attribute reporting for individual disks.

```config
smartignore parity 197
```

--------------------------------

### Undelete Specific File or Directory with SnapRAID

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Use the 'snapraid fix' command with the '-f' option to undelete a specific file or directory. This restores the item to its previous state.

```bash
snapraid fix -f FILE
```

```bash
snapraid fix -f DIR/
```

--------------------------------

### SnapRAID Fix Command with Error Filter

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Executes the SnapRAID fix command, specifically targeting blocks that have been marked with errors using the -e or --filter-error option.

```bash
snapraid -e fix
```

--------------------------------

### Ignore SMART Attribute on All Disks

Source: https://github.com/amadvance/snapraid/blob/master/doc/snapraid.txt

Ignores a specified SMART attribute (e.g., attribute 197) on all disks. This is useful if a disk reports unusual values for a particular attribute.

```config
smartignore * 197
```

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