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During the Christmas break I took the opportunity to upgrade my HP ML110 G5 from the sadly future-less OpenSolaris to another platform. I installed NexentaStor CE on a fairly small volume and created a larger (400GB) VMDK which I then added to the ZFS pool.
ZFS filesystems are created from space in the pool and can have many properties applied including size reservations, quotas, compression and deduplication. With a single 400GB VMDK created and assigned to the VM, I create a new zpool (called Datasets by Nexenta and configured through the web interface - command line mojo not required) and started creating new ZFS filesystems (called Shares, one to hold software installers, another for ISO images, a third for documents etc.).
Obviously a single disk is no good if there is a problem with the underlying drive, so I created a second 400GB VMDK on the other physical disk and presented it to the appliance (all disk rescanning is done without a reboot necessary). This mirroring is within the VSA and will not help if the primary disk fails as the VM configuration files and boot VMDK are not mirrored. ZFS stores a checksum for the data it writes and when configured in a mirror or RAID-Z, the filesystem is able to reconstruct the data in the event of disk write errors using the redundant data.
This means that while the VSA will not survive the primary disk physically dying, any corruptions that occur as a disk starts to die will be caught and corrected.
The performance advantages of the cache are not immediately obvious given that it takes time for the cache to populate. On top of the data resilience provided by the checksum, ZFS supports copy-on-write snapshots.
In summary, NexentaStor Community Edition is a very powerful piece of software (and this post only scratches the surface - no mention of its AD integration, iSCSI functionality etc.) that gives some high-end functionality *for free* and is certainly worth considering for your home lab.
Hi ChristianIf you have enough drives to dedicate to the Nexenta fileserver, then you could attach them as RDMs. I opted to turn it into a VMware ESXi 4.1 install to run alongside my existing HP ML115 G5 lab server. This operating system is derived from the OpenSolaris code base and builds on many Solaris technologies, including ZFS.

I assigned 4GB of RAM to the VM, the majority of which will be used as the ARC cache (see below for details).
Writes to a pool are striped across all disks in the pool by default, but disks within the pool can be mirrored to each other, or configured in parity RAID comprising of one, two or three parity disks (called RAIDZ, RAIDZ2 and RAIDZ3 respectively) to provide additional resilience. A scheduled housekeeping job called a scrub runs weekly to ensure the checksums and data are correct. This is very fast (being in RAM) and speeds up disk reads, but is limited to the physical memory in the machine (approximately 3GB in a 4GB VM). These can be automatically scheduled on a per-filesystem basis to provide a point in time snapshot.
Perhaps, but part of this work was to see what could be done with ZFS and the result is a very powerful storage setup.
Using RDMs was something I considered, but it would mean dedicating the entire disk to the NexentaStor VM.
I have a HP Microserver and as Esxi works quite well I also had a look at nexenta for working as a file server.I am puzzled as I am unsure if it is more secure to attach the SATAs directly and not as virtual volumes. The enterprise version is pay-for, but the free Community Edition supports datasets up to 18TB, which is easily enough for a home lab environment.
Zvols provide many of the same properties as a ZFS filesystem including compression and deduplication.
The process of copying data from the original disk to the mirror is called resilvering and can take some time.
While one option is to put performance critical data on the SSDs and less important VMs on SATA, the alternative is to use flash disk as cache. However, ZFS can support two additional caches: The L2ARC (Level 2 Adaptive Replacement Cache) and ZIL (ZFS Intent Log). While 20GB is not huge in terms of disk, it represents a significant amount of cache memory.

This can be configured so document data is snapshotted daily (or hourly), while more static data such as the ISO store taken weekly or monthly. Although NetApp have settled with Oracle, I don't know if the agreement covers other users of ZFS. ZFS is one of the best file systems and has many advantages over other file systems, few of these are –1.
Zvols can be shared over iSCSI and formatted by the initiator to hold a server's native filesystem (such as VMFS, NTFS, Ext3, HFS+ etc.). Secondly, there will be a performance overhead by running the NexentaStor CE as a VSA on top of the ESXi storage subsystem.
The best practice for creating a ZIL is to use mirrored flash drives on devices separate from the L2ARC, but as I only had one SSD, I opted to create a single L2ARC. Using the NexentaStor web interface, I paired the machines and configured some scheduled jobs to replicate specific filesystems from the primary VSA to this secondary VSA (using snapshot copies over SSH). While it might be possible to squeeze a bit more performance by running NexentaStor CE directly on the bare-metal, ESXi allows me to run a few other VMs alongside the VSA. This means that in the event the original server dies, the important data will still be available. Supports variable block sizes, manages cache efficiently and creates a lightweight file system.ZFS is available under Linux as zfs-fuse package under CDDL. At the terminal issue the following command to install zfs-fuse package –sudo apt-get install zfs-fuse2.

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23.01.2015 admin

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