We put the WD My Cloud DL4100 through some IOMeter tests with a CIFS share being accessed from up to 25 VMs simultaneously. The following four graphs show the total available bandwidth and the average response time while being subject to different types of workloads through IOMeter. The tool also reports various other metrics of interest such as maximum response time, read and write IOPS, separate read and write bandwidth figures etc. Detailed listings of the IOMeter benchmark numbers (including IOPS and maximum response times) for each configuration are linked below:
The takeaway from these tests is that beyond 15 or so simultaneous clients, the My Cloud DL4100 doesn't exhibit great performance consistency. Compared to other NAS units, there are weaknesses in the sequential access patterns, but the numbers for the random workloads are better.
Hmm, you say "the board must definitely be sporting a PCIe - USB 3.0 bridge", but then don't bother to look up the PCI ids from the lspci output. The device "1b21" "1142" is an ASMedia ASM1042A USB 3.0 Host Controller.
Building a custom FreeNas or Nas4Free box depending on your needs is a much better solution than any one of these anemic underpowered and overpriced solutions. Presence of ZFS on FreeNas is by far the most critically important aspect. If data loss prevention and integrity top priority, which should be, there are two great articles by Robin Harris. These articles are titled "Has Raid5 Stopped working?" and "Why Raid5 stops working in 2009" can be found with a quick search. Mr. Harris clearly explains the inadequacy of Raid5 and 6 as viable storage solutions. As far as I am concerned, most of these off the shelf units are not good options for data safety. Considering the rock solid encryption option ZFS offers its value becomes even more important.
People considering COTS NAS boxes are doing so either because they're a business that needs real support, or a consumer who needs ease-of-use and hand-holding, all of which being areas that a custom FreeNAS/Nas4Free box utterly fails to deliver. While both are great products, their target market doesn't have much overlap with the target market of these COTS boxes.
The articles by Robin Harris are unimpressive. He assumes that the advertised BER is a maximum, where in fact it appears to be a minimum (and several consumer lines advertise higher than 10^14 anyway). He also over-dramatizes an array rebuild failure due to read error; in that event, you simply create a new array from scratch and restore data from backups, since unlike Harris, you remember that RAID is a solution for AVAILABILITY, not backup.
I see your points. Our data is very important to us at our business. So we have to approach things as worst case scenario possibility. And some arguments made here make no sense. For businesses that NEED serious support this is NOT that SERIOUS of a product. And yes FreeNas does offer home/soho version of the product that was very well reviewed. For the individual that needs "hand-holding" availability of RAID means next to nothing. A simple back up drive from costco would do fine.
The fact that IT pros haven't adopted it in in spite of this sort of debunked fear mongering makes it pretty clear. Don't believe it? Fine, then use ZFS if it makes you feel better.
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kepstin - Wednesday, March 4, 2015 - link
Hmm, you say "the board must definitely be sporting a PCIe - USB 3.0 bridge", but then don't bother to look up the PCI ids from the lspci output. The device "1b21" "1142" is an ASMedia ASM1042A USB 3.0 Host Controller.pwr4wrd - Wednesday, March 4, 2015 - link
Building a custom FreeNas or Nas4Free box depending on your needs is a much better solution than any one of these anemic underpowered and overpriced solutions. Presence of ZFS on FreeNas is by far the most critically important aspect. If data loss prevention and integrity top priority, which should be, there are two great articles by Robin Harris. These articles are titled "Has Raid5 Stopped working?" and "Why Raid5 stops working in 2009" can be found with a quick search. Mr. Harris clearly explains the inadequacy of Raid5 and 6 as viable storage solutions. As far as I am concerned, most of these off the shelf units are not good options for data safety. Considering the rock solid encryption option ZFS offers its value becomes even more important.Black Obsidian - Wednesday, March 4, 2015 - link
People considering COTS NAS boxes are doing so either because they're a business that needs real support, or a consumer who needs ease-of-use and hand-holding, all of which being areas that a custom FreeNAS/Nas4Free box utterly fails to deliver. While both are great products, their target market doesn't have much overlap with the target market of these COTS boxes.The articles by Robin Harris are unimpressive. He assumes that the advertised BER is a maximum, where in fact it appears to be a minimum (and several consumer lines advertise higher than 10^14 anyway). He also over-dramatizes an array rebuild failure due to read error; in that event, you simply create a new array from scratch and restore data from backups, since unlike Harris, you remember that RAID is a solution for AVAILABILITY, not backup.
pwr4wrd - Wednesday, March 4, 2015 - link
I see your points. Our data is very important to us at our business. So we have to approach things as worst case scenario possibility. And some arguments made here make no sense. For businesses that NEED serious support this is NOT that SERIOUS of a product. And yes FreeNas does offer home/soho version of the product that was very well reviewed. For the individual that needs "hand-holding" availability of RAID means next to nothing. A simple back up drive from costco would do fine.Spoogie - Wednesday, March 4, 2015 - link
This has been debunked, which is why ZFS adoption has not taken hold.http://www.high-rely.com/blog/why-raid-5-stops-wor...
pbrutsche - Wednesday, March 4, 2015 - link
Sorry, that link doesn't explain why ZFS hasn't taken hold.Spoogie - Wednesday, March 4, 2015 - link
The fact that IT pros haven't adopted it in in spite of this sort of debunked fear mongering makes it pretty clear. Don't believe it? Fine, then use ZFS if it makes you feel better.pwr4wrd - Wednesday, March 4, 2015 - link
How can you fear monger in order to capitalize on a free product?dave_the_nerd - Wednesday, March 4, 2015 - link
It's not free if you have to buy a support contract and consulting services from iXSystems.dave_the_nerd - Wednesday, March 4, 2015 - link
Are you running your business without support agreements/maintenance contracts on your servers? *horror*