Mounting and Sharing ZFS File Systems Oracle Solaris ZFS Administration Guide

The official recommendation from Sun/Oracle is to scrub enterprise-level disks once a month, and cheaper commodity disks once a week. Automatic rollback of recent changes to the file system and data, in some circumstances, in the event of an error or inconsistency. Designed for long-term storage of data, and indefinitely scaled datastore sizes with zero data loss, and high configurability. After you have them pools imported you just need to issue this command.

However, a ZFS pool effectively creates a stripe across its vdevs, so the equivalent of a RAID 50 or RAID 60 is common. On Solaris, when entire disks are added to a ZFS pool, ZFS automatically enables their write cache. This is not done when ZFS only manages discrete slices of the disk, since it does not know if other slices are managed by non-write-cache safe filesystems, like UFS.

In addition, I presented how to disable mounting for the ZFS pools and manually mount filesystems from the mount-disabled ZFS pools. If you don’t want the filesystems, you create on the ZFS pool pool2 to use the mountpoint property. You can set the mountpoint property of the ZFS pool pool2 to none. This way, the mountpoint property of the ZFS filesystems on the pool pool2 will also be set to none and will be unmounted by default. You will have to set a mountpoint value for the filesystems you want to mount manually. As a result, you can manually share a file system with options that are different from the settings of thesharenfs property.

solaris mount zfs

The quota and reservation properties are convenient for managing space consumed by datasets. In this example, a ZFS file system sandbox/fs1 is created and shared with the sharesmb property. This property was never explicitly set for this dataset or any of its ancestors. Be aware that the use of the -r option clears the current property setting for all descendent datasets. The zfs list output can be customized by using of the -o, -f, and -H options.

Opening up ZFS pool as writable

Hello, Need to ask the question regarding extending the zfs storage file system. Currently after using the command, df -kh u01-data-pool/data 600G G 93% /data /data are only 48 gb remaining and it has occupied Make Money Coding: 12 Smart Ideas That Really Work in 93% for total storage. The following step is important for the ZFS filesystem to be controlled by VCS. Setting the legacy property prevents ZFS from automatically mounting and managing this file system.

solaris mount zfs

You can determine specific mount-point behavior for a file system as described in this section. @AndrewHenle, I checked “beadm list” as well, and it has the same-dated entries as the list of snapshots had. It is even possible that some “experimenting” with beadm in the past led to the rollback now on reboot, but is there a chance to recover at least single files from that rollback? In particular it is possible that I once tried selecting a different BE for next boot, but then changed the BE back to what it was before… Maybe that second change did not really undo the first one, but caused now a rollback to whatever was the freshest snapshot back then…

Changing Mount Path of ZFS Filesystems

This property value was set by using the zfs mount -o option and is only valid for the lifetime of the mount. For more information about temporary mount point properties, see Using Temporary Mount Properties. This property value was explicitly set for this dataset by using zfs set. In addition to the standard native properties, ZFS supports arbitrary user properties. User properties have no effect on ZFS behavior, but you can use them to annotate datasets with information that is meaningful in your environment. When snapshots are created, their space is initially shared between the snapshot and the file system, and possibly with previous snapshots.

The need for RAID-Z3 arose in the early 2000s as multi-terabyte capacity drives became more common. This increase in capacity—without a corresponding increase in throughput speeds—meant that rebuilding an array due to a failed drive could “easily take weeks or months” to complete. During this time, the older disks in the array will be stressed by the additional workload, which could result in data corruption or drive failure.

The unmount command fails if the file system is active or busy. To forceably unmount a file system, you can use the -f option. Be cautious when forceably unmounting a file system, if its contents are actively being used. When changing from legacy or none, ZFS automatically mounts the file system.

solaris mount zfs

The values of these properties can have mixed upper and lower case letters. Because SMB shares requires a resource name, a unique resource name is constructed from the dataset name. The constructed name is a copy of the dataset name except Apple Developer Program LoopDocs that the characters in the dataset name, which would be illegal in the resource name, are replaced with underbar characters. A pseudo property name is also supported that allows you to replace the dataset name with a specific name.

Limitations in preventing data corruption

That is, if a quota is set on the tank/home dataset, the total amount of space used by tank/home and all of its descendents cannot exceed the quota. Similarly, if tank/home is given a reservation, tank/home and all of its descendentsdraw from that reservation. The amount of space used by a dataset and all of its descendents is reported by the used property. Both tank/home/bricker and tank/home/tabriz are initially shared writable because they inherit the sharenfs property from tank/home.

  • Indicates whether this dataset has been added to a non-global zone.
  • After the property is set to ro , tank/home/markis shared as read-only regardless of the sharenfs property that is set fortank/home.
  • File names are always stored unmodified, names are normalized as part of any comparison process.
  • In addition, any shared file systems are unshared and shared in the new location.
  • This property value was set by using the zfs mount -o option and is only valid for the lifetime of the mount.

If this property is set, then the mount point is not honored in the global zone, and ZFS cannot mount such a file system when requested. When a zone is first installed, this property is set for any added file systems. The block size cannot be changed once the volume has been written, so set the block size at volume creation time. This property enforces a hard limit on the amount of space used. This hard limit does not include space used by descendents, such as snapshots and clones. Read-only property that identifies the amount of data accessible by this dataset, which might or might not be shared with other datasets in the pool.

When you create a ZFS pool pool1, the mountpoint of the pool pool1 is set to /pool1, and canmount is set to on. When you create a new ZFS filesystem documents on the pool pool1, the mountpoint for the filesystem is set to /pool1/documents, and its canmount is set to on by default. In the same way, if you create another ZFS filesystem downloads on the pool pool1, the mountpoint for the filesystem is set to /pool1/downloads, and its canmount is set to on by default. The canmount and mountpoint properties of the ZFS filesystem are used to configure the mounting behavior of the ZFS pools and filesystems. When the mountpoint property is changed, the file system is automatically unmounted from the old mount point and remounted to the new mount point.

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Sets the minimum amount of space that is guaranteed to a dataset, not including descendents, such as snapshots and clones. When the amount of space that is used is below this value, the dataset is treated as if it were taking up the amount of space specified by refreservation. Therefreservation reservation is accounted for in the parent datasets’ space used, and counts against the parent datasets’ quotas and reservations. Read-only property for cloned file systems or volumes that identifies the snapshot from which the clone was created. The origin cannot be destroyed (even with the -r or -f options) as long as a clone exists.

3.1. Listing Basic ZFS Information

For more information about automanaged mount points, see Managing ZFS Mount Points. Similar to mount points, ZFS can automatically share file systems by using thesharenfs property. Using this method, you do not have to modify the /etc/dfs/dfstabfile when a new file system is added. The special value onis an alias for the default share options, which are read/write permissions for anyone. The special value off indicates that the file system is not managed by ZFS and can be shared through traditional means, such as the/etc/dfs/dfstab file. Controls whether the given file system can be mounted with the zfs mount command.

In the following example, the read-only mount option is temporarily set on thetank/home/perrin file system. In the following example, the read-only mount option is temporarily set on thetank/home/neil file system. When file systems are GPU programming for EDA with OpenCL IEEE Conference Publication created on the NFS server, the NFS client can automatically discover these newly created file systems within their existing mount of a parent file system. To prevent a file system from being mounted, set the mountpoint property tonone.

Otherwise, the sharemgr command is invoked with options that are equivalent to the contents of this property. If refreservation is set, a snapshot is only allowed if enough free pool space is available outside of this reservation to accommodate the current number of referenced bytes in the dataset. Read-only property that indicates whether this file system, clone, or snapshot is currently mounted. Read-only property that identifies the date and time that this dataset was created. Controls whether the access time for files is updated when they are read.

I have attached the old drive image to the new solaris 11.3 vm and have booted the vm. Nothing appears auto-mounted (though, there are a lot of items listed when I type ‘mount’). Setting refquota or refreservation higher than quota or reservation have no effect. If you set the quota or refquota properties, operations that try to exceed either value fail. It is possible to a exceed a quota that is greater than refquota. If some snapshot blocks are dirtied, you might actually exceed the quota before you exceed the refquota.

(on some other systems ZFS can utilize encrypted disks for a similar effect; GELI on FreeBSD can be used this way to create fully encrypted ZFS storage). A number of other caches, cache divisions, and queues also exist within ZFS. For example, each VDEV has its own data cache, and the ARC cache is divided between data stored by the user and metadata used by ZFS, with control over the balance between these. If the log device itself is lost, it is possible to lose the latest writes, therefore the log device should be mirrored. In earlier versions of ZFS, loss of the log device could result in loss of the entire zpool, although this is no longer the case. Therefore, one should upgrade ZFS if planning to use a separate log device.