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[Last updated on 2017-03-20] I need a lot of reliable and cheap storage space (media collection, backups). Hardware RAID tends to be expensive and clunky. I recognize quite a few advantages in ZFS on Solaris/FreeBSD, and Linux MD RAID: • Performance. In many cases they are as fast as hardware RAID, and sometimes faster because the OS is aware of the RAID layout and can optimize I/O patterns for it. Indeed, even the most compute intensive RAID5 or 6 parity calculations take negligible CPU time on a modern processor. For a concrete example, Linux 2.6.32 on a Phenom II X4 945 3.0GHz computes RAID6 parity at close to 8 GB/s on a single core (check dmesg: 'raid6: using algorithm sse2x4 (7976 MB/s)').
Apr 02, 2016 JMB38X SD/MMC Host Controller - Win 10 driver needed Hi Successfully completed a clean reinstall with no problems, this time it picked up my Nvidia 310M graphics card (will update my other thread) and installed the latest driver for it. Download JMicron Other Drivers & Tools drivers, firmware, bios, tools, utilities. JMicron's bridge controller series offers a full range of high-speed and super-speed FireWire and SATAII/III interfaces for data storage applications. Each controller comes with JMicron's proprietary RAID engine hardware design, which offers the best reliability & performance available.
So achieving a throughput of 500 MB/s on a Linux MD raid6 array requires spending less than 1.5% CPU time computing parity. Now regarding the optimized I/O patterns, here is an interesting anecdote: one of the steps that Youtube took in its early days to scale their infrastructure up was to switch from hardware RAID to software RAID on their database server. They noticed a 20-30% increase in I/O throughput. Watch @ 34'50'. • Scalability.
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ZFS and Linux MD RAID allow building arrays across multiple disk controllers, or multiple SAN devices, alleviating throughput bottlenecks that can arise on PCIe links, or GbE links. Whereas hardware RAID is restricted to a single controller, with no room for expansion.
• Reliability. No hardware RAID = one less hardware component that can fail. 
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• Ease of recoverability. The data can be recovered by putting the disks in any server. There is no reliance on a particular model of RAID controller. • Flexibility.
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It is possible to create arrays on any disk on any type of controller in the system, or to move disks from one controller to another. • Ease of administration. There is only one software interface to learn: zpool(1M) or mdadm(8). No need to install proprietary vendor tools, or to reboot into BIOSes to manage arrays. Obviously cheaper since there is no hardware RAID controller to buy. Consequently, many ZFS and Linux MD RAID users, such as me, look for non-RAID controllers that are simply reliable, fast, cheap, and otherwise come with no bells and whistles. Most motherboards have up to 4 or 6 onboard ports (be sure to always enable AHCI mode in the BIOS as it is the best designed hardware interface that a chip can present to the OS to enable maximum performance), but for more than 4 or 6 disks, there are surprisingly not that many choices of controllers.
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Lenovo s110 wireless drivers for mac. Over the years, I have spent quite some time on the controllers manufacturers' websites, the LKML, linux-ide and ZFS mailing lists, and have established a list of SATA/SAS controllers that are ideal for ZFS or Linux MD RAID. I also included links to online retailers because some of these controllers are not that easy to find online. The reason the list contains SAS controllers is because they are just as good as an option as SATA controllers: many of them are as inexpensive as SATA controllers (even though they target the enterprise market), they are fully compatible with SATA 3Gbps and 6Gbps disks, and they support all the usual features: hotplug, queueing, etc.
