It is recommended that you read through this entire chapter first, before configuring your storage disks, so that you are aware of all of the possible features, know which ones will benefit your setup most, and are aware of any caveats or hardware restrictions. If you click on Storage a€? Volumes a€? Volume Manager, you will see a screen similar to the example shown in Figure 8.1a. If you have more than five disks and are using ZFS, consider the number of disks to use for best performance and scalability.
Depending upon the size and number of disks, the type of controller, and whether or not encryption is selected, creating the volume may take some time. This is not the encryption method used by Oracle’s version of ZFS as that version is not open source and is the property of Oracle. Once an existing volume has been selected from the drop-down menu, drag and drop the desired disk(s) and select the desired volume layout. When adding disks to increase the capacity of a volume, ZFS supports the addition of virtual devices, known as vdevs, to an existing ZFS pool. If you try to add an incorrect number of disks to the existing vdev, an error message will appear, indicating the number of disks that are needed.
The chapter on Sharing contains configuration examples for several types of permission scenarios. Once a volume or dataset is created, it will be listed by its mount point name in Storage a€? Volumes a€? View Volumes.
Deduplication is the process of not creating duplicate copies of data in order to save space. In most cases, using compression instead of deduplication will provide a comparable storage gain with less impact on performance. TB of deduped data, and if the system doesn’t have the needed RAM it will panic, with the only solution being to add more RAM or to recreate the pool. When selecting a compression type, you need to balance performance with the amount of disk space saved by compression.
Use the drop-down menu to select the disk to import, select the type of filesystem on the disk, and browse to the ZFS dataset that will hold the copied data. Figure 8.1g shows the initial pop-up window that appears when you select to import a volume. If an existing ZFS pool does not show in the drop-down menu, run zpool import from Shell to import the pool. If you suspect that your hardware is not being detected, run camcontrol devlist from Shell. If you are importing an existing GELI-encrypted ZFS pool, you must decrypt the disks before importing the pool. Managing Encrypted Volumes for instructions on how to manage the keys for encrypted volumes.
Storage a€? Volumes a€? View Disks allows you to view all of the disks recognized by the FreeNASA® system. If you click Storage a€? Volumes a€? View Volumes, you can view and further configure existing ZFS pools, datasets, and zvols.


If you click the entry for a pool, several buttons will appear at the bottom of the screen.
If you do check the box to mark the disks as new, the pool and all the data in its datasets, zvols, and shares will be destroyed and the underlying disks will be returned to their raw state. Upgrade: used to upgrade the pool to the latest ZFS features, as described in Upgrading a ZFS Pool. If you click a dataset in Storage a€? Volumes a€? View Volumes, six buttons will appear at the bottom of the screen. Remove recover key: Typically this is only performed when the administrator suspects that the current recovery key may be compromised. If you are using any form of redundant RAID, you should replace a failed drive as soon as possible to repair the degraded state of the RAID. If the hardware is not AHCI capable, shutdown the system in order to physically replace the disk.
In the example shown in Figure 8.1p, a failed disk is being replaced by disk ada5 in the volume named volume1.
First, make sure that a passphrase has been set using the instructions in Encryption before attempting to replace the failed drive. If the following additional steps are not performed before the next reboot, you may lose access to the pool permanently. If you have added any log or cache devices, these devices will also appear in Storage a€? Volumes a€? View Volumes a€? Volume Status. Removing or replacing a cache device will not result in any data loss, but may have an impact on read performance until the device is replaced. The safest way to perform this is to use a spare drive port or an eSATA port and a hard drive dock. If you do not have a spare drive port, you will need to replace one drive with a larger drive using the instructions in Replacing a Failed Drive.
If you cannot see the extra space, you may need to run zpool online -e pool_name device_name for every device listed in zpool status. The following command splits from the existing three disk mirror test a new ZFS volume named migrant containing one disk, da4.
At this point, da4 can be physically removed and installed to a new system as the new pool is exported as it is created.
Now that the new system has been cloned, you can detach da4 and install it back to the original system.
A periodic snapshot task allows you to schedule the creation of read-only versions of ZFS volumes and datasets at a given point in time.
Snapshots provide a clever way of keeping a history of files, should you need to recover an older copy or even a deleted file.
A replication task allows you to automate the copy of ZFS snapshots to another system over an encrypted connection. To obtain a copy of the replication key: on PUSH go to Storage a€? Replication Tasks a€? View Replication Tasks.


To create the replication task, click Storage a€? Replication Tasks a€? Add Replication which will open the screen shown in Figure 8.3b. If the key is correct and replication is still not working, try deleting all snapshots on PULL except for the most recent one. PULL and use the zfs destroy -R volume_name@snapshot_name command to delete the stuck snapshot. When you create a volume that is formatted with ZFS, a ZFS scrub is automatically scheduled for you. Storage a€? Scrubs and a summary of this entry can be viewed in Storage a€? Scrubs a€? View Scrubs. The key should be protected by a strong passphrase and any backups of the key should be securely stored. After extending the volume, you should immediately recreate both using the instructions in Managing Encrypted Volumes.
Since there is no redundancy, you do not have to add the same amount of disks as the existing stripe. The import is meant to be a temporary measure in order to copy the data from a disk to an existing ZFS dataset. Similar to datasets, you can not edit a zvol’s name and you will need to confirm that you wish to destroy the zvol. If the key is every lost or destroyed and there is no backup key, the data on the disks is inaccessible.
If the disk is a member of an encrypted ZFS pool, the menu will also prompt you to input and confirm the passphrase for the pool. For other ZFS versions, removing or replacing the log device will lose any data in the device which had not yet been written. For example, if snapshots are scheduled for every 2 hours, replication occurs every 2 hours. If the snapshot is not replicated, refer to Troubleshooting Replication for troubleshooting tips. VMware Workstation and other IT tutorials.Free Stuff – Free virtualization utilities, ESXi Free, Monitoring and free backup utilities for ESXi and Hyper-V.
This means that you can now create pools, datasets, snapshots, and zvols in either the command line or the GUI and they will stay in sync with each other.Support for multipath devices on systems containing dual expander SAS backplanes, SAS drives, or dual expander JBODs with SAS drives. ESX Virtualization site has started as a simple bookmarking site, but quickly found a large following of readers and subscribers. Free SoftwareAltaro VM Backup - Protect your VMware & Hyper-V VMs for FREE with Altaro VM Backup.



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Comments

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