Best Zfs Raid For 4 Drives – Grow/OpenZFS supports many complex disk topologies, but “spiral stack sitting on a desk” is still not one of them.
OpenZFS founding developer Matthew Ahrens last week announced an extension to RAIDz, one of the most requested features in ZFS history. A new feature allows a ZFS user to increase the size of a single RAIDz vdev. For example, you can use the new feature to convert a three-disk RAIDz1 into a four, five, or six RAIDz1.
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OpenZFS is a complex file system, and explaining how this feature works will probably be a little difficult. So if you’re new to ZFS, you can head back to our full introduction to ZFS 101. Extending Storage in ZFS
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In addition to being a file system, ZFS is a storage array and volume manager, which means you can support all disk devices, not just one. The heart of the ZFS storage system,
. But managing storage in this way requires some planning and budgeting in advance that hobbyists and homeowners are often not thrilled about.
While not sharing the “pool” concept with ZFS, it often offers the ability to expand and/or reshape an array in-place. For example, you can add one drive to a six-drive drive.
Soap opera. Live rebuilding can be quite painful, especially with near-complete sequences; It’s quite possible that such a task would take a week or more to complete, with burst performance limited to a quarter or less of the total time.
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Historically, ZFS avoided this type of extension. ZFS was originally designed for business use, and reshaping an array in real-time is usually not a business startup. Decreasing the performance of your storage to unusable levels for a few days often costs far more in labor and overhead than buying a whole new set of hardware. Real-time expansion is potentially very dangerous because it involves reading and rewriting all the data and puts the array in a temporary and much less tested half-this, half-that state until completion.
The extension is unlikely to significantly change the way you use ZFS. However, managing it will be easier and more practical.
As complete units rather than trying to move around them. But hobbyists, home workers, and small users all work with ZFS on the same device
Enlarge / In this slide, we see a four-disk RAIDz1 (left) expanded to a five-disk RAIDz1 (right). Note that the data is still recorded in four wide bands!
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Therefore, although the user will see the additional space provided by the new drives, the storage efficiency of the expanded data will not be increased by the new drives. In the example above, we started with six disks.
With 67 percent of nominal storage efficiency across ten drives (four out of six sectors are data)
A ten-disk RAIDz2 has a nominal storage efficiency of 80 percent (eight out of ten sectors are data), but a legacy retention efficiency of 67 percent because legacy extended data is still written in six-wide stripes.
For example, if you write one block of metadata (data that includes file name, access rights, and location on disk), it is contained in one block of metadata.
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It won’t look like someone was “born” designed that way – at least not at first. Even though there are more drives in the mix, the internal data structure doesn’t change.
, additional disks mean more spindles to distribute the work. It probably won’t give you a mind-blowing speed boost – six wide lanes on a seven-drive drive.
It can be cut equally into four 32KB data chunks with two 32KB chunks with parity. The same record was divided into two parts.
Stack — The workload on an individual disk can be much lower for the old, narrower layout than for the new, wider layout. 128 KiB
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, for example, so we’re a bit misunderstanding whether more disks but smaller chunks will be more than fewer disks but bigger chunks.
The only thing you can be sure of is that the new expanded configuration should generally perform as well as the original unexpanded version, and if most of the data is (over)written in the new width, the expanded
It won’t perform differently or be less reliable than something that was designed that way from the start.
To the new width at runtime – after all, it’s still reading and rewriting data, right? We asked Ahrens why the original width was left as it is, and he said, “It’s easier and safer that way.”
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, but according to Ahrens, doing things this way would be extremely intrusive for ZFS formatting on disk. The extension must be constantly updated
If knowing four wide lanes on a new five-wide vdev really makes your teeth itch, you can read and rewrite your data yourself after the expansion is complete. The easiest way to do this is to use
It doesn’t actually damage anything from the old data, but since you naturally delete and/or replace data during its lifetime
Most will naturally rewrite as needed, without the need for admin intervention or long-term high storage costs from obsessively reading and rewriting everything at once.
Zfs Overview And How Zfs Is Used In Ece/cis At The University Of Delaware Ben Miller.
Arens’ new code is not part of any OpenZFS release and has not been added to anyone else’s repositories. We asked Ahrens when we can expect the code to be in production, and unfortunately it will take some time.
It is too late to include the RAIDz extension in the upcoming OpenZFS 2.1 release (2.1 release candidate 7 is already available). It should be included in the next major release of OpenZFS; It’s too early to give specific dates, but major releases usually happen once a year.
In general, we expect the RAIDz extension to appear in products such as Ubuntu and FreeBSD around August 2022, but this is only a guess. TrueNAS may launch it into production earlier than this because ixSystems tends to pull ZFS features from master before its official release.
Matt Ahrens introduced the RAIDz extension at the FreeBSD Developer Summit – his talk starts at 1 hour 41 minutes in this video.
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Jim Salter Jim is a writer, podcaster, sysadmin for hire, coder and father of three; It should not be at this time. If you work with storage applications or storage hardware, chances are you’ve heard of ZFS. ZFS is essentially a software RAID implementation, but in my experience it’s the most reliable software RAID I’ve worked with.
I’ve worked with several hardware RAID implementations over the years, and for the most part they’re pretty much on par. However, most hardware RAID implementations I’ve seen, including mine, aren’t done that well. Before moving on to ZFS RAID, I’ll cover the main issues I encountered with hardware RAID setup that led to my switch to ZFS. RAID = “Hardware RAID” in the list below
I first discovered ZFS or “RaidZ” in 2011 (later in VMWare) when I was deciding to set up storage for our virtual disk images. We were always short on space as the hardware RAID controllers we had at the time only supported small drives, so I decided to do some research. My first attempt at ZFS was using
Now it’s amortized, so if you want to go the Solaris route, I recommend Omni. I was familiar with Linux at the time, but ZFS was designed for Solaris, which felt close to Linux but different enough to have a learning curve.
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I used Openindiana until it was updated and then switched to OmniOS, but Solaris for some reason – partly because of the different CLI – continued to annoy me. However, the main catalyst for researching ZoL (ZFS on Linux) was my dream of a unified compute and storage node. In summary, I have been running ZoL on CentOS, Ubuntu and Debian for about 2 years without any major or “mysterious” events, both at work and at home. The purpose of this meeting was to answer questions you may have:
In this section, I assume you know nothing about ZFS, so anyone can follow along. However, I will break it down so you can skip it if you already know. While most of what I’ve covered will work on Solaris, keep in mind that these steps are on Linux, so some of the techniques may not work on Solaris.
I’ll be doing a live install on a virtual machine to make sure I don’t miss anything, so if you follow exactly what I’m doing
Now that the installation is complete I’m switching to SSH, for various reasons I still use Windows for my primary work machine and highly recommend Cygwin over traditional putty.
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Log in via ssh or local if you prefer with the username you created. You’ll want to climb the input to get started
Because Ubuntu doesn’t actually set a password for the “root” user. You’ll want to reboot as there’s a chance that a new kernel might have been installed during the update command and ZFS needs to be reinstalled every time a kernel is updated – we’ll tell you more