<html><center><span style="color:#b7620b;font-size:300%;">Not for public use</span></center></html>
<html><center><span style="color:#b7620b;font-size:300%;">Not for public use</span></center></html>
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* [[https://wiki.omv-extras.org/doku.php?id=misc_docs:omv_extras|OMV-Extras]] must be pre-installed.
* [[https://wiki.omv-extras.org/doku.php?id=misc_docs:omv_extras|OMV-Extras]] must be pre-installed.
* An additional (dedicated) drive is required to store SnapRAID parity data. SnapRAID's parity drive must be the same size, or larger, than the largest protected drive. This is a hard requirment.
* An additional (dedicated) drive is required to store SnapRAID parity data. SnapRAID's parity drive must be the same size, or larger, than the largest protected drive. This is a hard requirment.
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* For reports on drive health and automating SnapRAID administrative tasks, setting up -> [[https://wiki.omv-extras.org/doku.php?id=omv6:new_user_guide#server_notifications|Server Notifications]] is **recommended**.
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* For reports on drive health and automating SnapRAID administrative tasks, setting up -> [[https://wiki.omv-extras.org/doku.php?id=omv7:new_user_guide#server_notifications|Server Notifications]] is **recommended**.
* Enabling -> [[https://wiki.omv-extras.org/doku.php?id=omv7:new_user_guide#hard_drive_health_and_smart|SMART]] and scheduling a weekly short test, for all protected drives, is recommended.
* Enabling -> [[https://wiki.omv-extras.org/doku.php?id=omv7:new_user_guide#hard_drive_health_and_smart|SMART]] and scheduling a weekly short test, for all protected drives, is recommended.
* Consider testing the server's ram with a test program like -> [[https://www.memtest86.com/|memtest86]]. Faulty ram is a known cause for data loss when using SnapRAID.
* Consider testing the server's ram with a test program like -> [[https://www.memtest86.com/|memtest86]]. Faulty ram is a known cause for data loss when using SnapRAID.
Split Parity is a new SnapRAID feature that is supported in OMV7:<br>
Split Parity is a new SnapRAID feature that is supported in OMV7:<br>
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- While the rule, "<i><b>the parity drive must equal or exceed the size of the largest protected data drive</i></b>" still applies; split parity allows combing smaller drives to create what appears to be a single large parity drive.<br>
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- While the rule, "<i><b>the parity drive must equal or exceed the size of the largest protected data drive</i></b>" still applies; split parity allows combining smaller drives to create what appears to be a single large parity drive.<br>
- New users should note that split parity is an advanced feature that increases admin complexity. Split parity configurations are not recommended for users who are not familiar with SnapRAID.
- New users should note that split parity is an advanced feature that increases admin complexity. Split parity configurations are not recommended for users who are not familiar with SnapRAID.
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**1**. For most users, the defaults in these fields are fine.\\
**1**. For most users, the defaults in these fields are fine.\\
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**2**. **Send Mail** will work only if users have configured and tested notifications, as outlined here -> [[https://wiki.omv-extras.org/doku.php?id=omv6:new_user_guide#server_notifications|Server Notifications]]. Configuring Server Notifications and selecting **Send Mail** is highly recommended.\\
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**2**. **Send Mail** will work only if users have configured and tested notifications, as outlined here -> [[https://wiki.omv-extras.org/doku.php?id=omv7:new_user_guide#server_notifications|Server Notifications]]. Configuring Server Notifications and selecting **Send Mail** is highly recommended.\\
**3**. **Run Scrub** This is a recommended action to complete the SnapRAID maintenance cycle. While **Diff** and **Sync** run quickly, dependent of the size of protected disks and other factors, **Scrub** may take considerable time.\\
**3**. **Run Scrub** This is a recommended action to complete the SnapRAID maintenance cycle. While **Diff** and **Sync** run quickly, dependent of the size of protected disks and other factors, **Scrub** may take considerable time.\\
**4**. **Pre-hash** is an option that is used together with the** Sync** command. **Pre-hash** assigns a checksum before parity calculations are done. It's an extra safety measure that reads data two times to insure integrity.\\
**4**. **Pre-hash** is an option that is used together with the** Sync** command. **Pre-hash** assigns a checksum before parity calculations are done. It's an extra safety measure that reads data two times to insure integrity.\\
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<html><center><b>Physically remove the drive.</b></center></html>
<html><center><b>Physically remove the drive.</b></center></html>
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<html><center>If necessary, refer to <b>Storage</b>, <b>Disks</b> and compare serial numbers to drive device names under <b>Storage</b>, <b>File Systems</b>. The idea is to look at drive labels and find the serial number that is "missing" (not displayed), to insure that the correct physical drive is removed.</center></html>
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<html><center>If necessary, refer to <b>Storage</b>, <b>Disks</b> and compare serial numbers to drive device names under <b>Storage</b>, <b>File Systems</b>. The idea is to look at the drive's physical label and find the serial number that is "missing" (not displayed), to insure that the correct physical drive is removed.</center></html>
<html><center>Click **Save** and **apply** the configuration change.</center></html>
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<html><center>Click <b>Save</b> and <b>apply</b> the configuration change.</center></html>
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{{ ::omv6-plugins-snapraid-26.jpg?nolink&600 |}}
{{ ::omv6-plugins-snapraid-26.jpg?nolink&600 |}}
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<html><center>(The UNRECOVERABLE error may be due to a change made //after// the last **Sync** operation, that cannot be restored.)</center></html>
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<html><center>(The UNRECOVERABLE error may be due to a change made <i>after</i> the last **Sync** operation, that cannot be restored.)</center></html>
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This concludes data restoration to a SnapRAID protected drive.\\
This concludes data restoration to a SnapRAID protected drive.\\
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**MergerFS users** skip see the section below titled; **Replacing a Failed Drive in MergerFS**. \\
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**MergerFS users** skip see the section below titled; **Replacing a Failed Drive in MergerFS**.\\
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The remainder of tasks, within OMV, would be to repointing **Shared Folders** and other services to the replacement drive. To repoint shared folders, see the guidance provided -> [[https://wiki.omv-extras.org/doku.php?id=omv6:utilities_maint_backup#repointing_a_shared_folder|here]].\\
The remainder of tasks, within OMV, would be to repointing **Shared Folders** and other services to the replacement drive. To repoint shared folders, see the guidance provided -> [[https://wiki.omv-extras.org/doku.php?id=omv6:utilities_maint_backup#repointing_a_shared_folder|here]].\\
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The result now shows mount points by UUID. Where device names may be reordered on bootup, UUID's do not change.<html><center>\\
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The result now shows mount points by **UUID** (**U**niversally **U**nique **ID**entifier). Where device names may be reordered by BIOS or UEFI on bootup, UUID's do not change.\\
Note the "Copy and Paste" Icon{{:OMV6-Plugins-SnapRAID-05-06.jpg?25|}} at the end of each drive UUID. This tool copies exact drive paths and UUID's to the clipboard.\\
Note the "Copy and Paste" Icon{{:OMV6-Plugins-SnapRAID-05-06.jpg?25|}} at the end of each drive UUID. This tool copies exact drive paths and UUID's to the clipboard.\\
We, who support the openmediavault project, hope you’ve found this guide to be useful and that you’ll find your openmediavault server to be efficient, easy to use, and enjoyable.\\
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If you found this plugin guide to be helpful, please consider a modest donation to support the hosting costs of this server.\\
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