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Question: As fas as i know ZFS needs more ram for better performance. Do i still need big size ram even if buy this controller ?
Document: This is probably great for a network of machines with this card, but quite frustrating for a single machine. The configuration software shows lots of Advanced features that are marked as disabled but there is no clue as to how to enable them. Then after digging, you find that you need to buy add-ons to enable security, encryption, or even MegaRAID recovery. Having used the Intel raid software and the Marvell software, this just seems like stepping back in time and capability. But it gets worse.
I'm using this on a FreeNAS system, on an old DFI nForce4 AMD board. Running ZFS so I can't speak to the onboard RAID, but it works just fine to expose four Barracudas and an SSD, with no signs of saturating even when all are running full speed. (I ran a set on bare-disk aggregate benchmarks before setting up zfs).You will need a splitter cable to connect to sata drives.
ZFS scrubs (showing off mostly read performance) now top 450MB/sec, even with the relatively slow, low power drives. Couldn't be happier with the performance, really. Install was a plug and play affair on Fedora 14, no fuss at all. It's also worth noting that my (accidental) downmoding of the card to x4 had no other ill effects, and it worked fine, as it should.
Sure there are cheaper cards, but after you buy them all, trying to find one that will work, you'll spend more money than if you just buy this one to start with. Goofy raid controller interface, reminds me of highpoint, but it gets the job done. To get the PCIe 3.0 version you will spend 3 times as much, and I doubt its worth it. This card is a perfect for moderate (low?) price and high performance applications of up to 8 drives.
I use ZFS with Arch Linux and using this card increased my performance by about 20%. The hardware is very nice and driver support for the LSI controller chip is built right into the Linux Kernel. All I had to do was rebuild my initramfs to include the needed kernel modules and everything worked! ZFS picked itself right up and mounted my pool without any problems at all.
I can't really rate this one highly enough. While playing with ZFS on Linux, all the flaws in my storage subsystem (8x2TB Seagate LP drives in a port multiplier chassis, all going back to an i7-920 fileserver) really were shown up. Read speeds barely cracking 50MB/sec were the norm. Tests with md didn't show much better, so it was obviously time for an improved storage adapter setup.Migrating from the port multipliers to this card got double the speed, even with relatively slow drives.
(more on that)Overall, it is a pretty expensive card for just mirroring drives. I would buy it if I had a computer that didn't support SATA3 controller or if I had a 4T hard drive (which I do and hence why I am using the card) that the motherboard doesn't recognize in RAID configurations. But lack of RAID 5 makes this a fairly limited card given the number of physical drives that I can connect to it.The software for this card is just terrible.
I could not get the system stable with the the overclock, so I had to return the bios settings to default (2.66GHZ). Unfortunately, since ZFS is a CPU bound filesystem, I had some performance decreases in some file operations like re-read and random reads (tested with iozone).
Modern drives have so much cache that you don't really need a caching RAID controller anymore. I have 8 3TB drives connected and assembled into an mdadm RAID under Linux running in a VM on a VMWare ESXi host, and it's BLAZING fast.. 1GB/sec reads and 800MB/sec writes. Very very happy with this cost-effective solution
Installation is straight forward. The performance increase over the on board raid controller was phenomenal. I am running tow 512GB Vertex 4 ssd's in RAID 0. With ATTO Benchmark my drives 952Mb/sec write and 878Mb/sec read. The on board Marvell controller produced less than a third of those numbers.
Answer: Yes,you will still need more ram even if you buy this controller.