Question about VisionMan VisionVault 4TB Smart NAS Appliance - Gigabit LAN, Hardware RAID 0, 5, Span, 128MB DDR, 4x (SSTE-2NAS30)

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Write and read spead slow; only 10MB/s

I have a SCM400 with 4 1TB disks. Disks are WD Caviar Black SATA II. I am connected with my Vista PC to the SCM400 on a 1GB network.
When transfering files between the SCM400 and my PC I find the speed rather slow. My Vista 'Moving File' window says that it transfers at 10MB/sec when it's fast, but mostly it's just 6 MB/sec.
I read somewhere else that people tested with a NAS reaching speeds of 90MB/sec.
What is a normal speed and what could be holding back the file transfer speed?

Thank you,
Pieter

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This has been a commonly reported concern. Here are a few links that may provide a solution to this problem:

Additionally, some Vista users report better file transfer rates using WinRAR & Teracopy.
For maximum file transfer, also check all elements in your network, i.e. switches & routers, etc. For discussion of max speeds cf. here

Please consult this article from Microsoft to take steps to improve your system's performance with Vista, by clicking here
For troubleshooting performance issues, please see these articles and the links within them: TroubleshootVistaPerformance and Troubleshoot Vista Startup and Vista Diagnostics
Finally, you may wish to consult this General Setup&Maintenance guide.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!


Posted on Apr 17, 2009

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Posted on Jan 02, 2017

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Nss4000 with home computer quad core 2.4mghz 8 g ram. all rj45 connections are gigabit transfer speed between computer and nas is 11MB/s what should the tfr speed be? Should I be using cat 6...


Your speed is going to be limited by your slowest component. Most cables you buy in a store are really cat 5e which will do 1000Mbps. If your getting 11MBps (~100Mbps) then something in your network is running at 100Mbps. Assuming your going from Computer -> Router -> Nas
Computer needs a 1Gbps NIC in it, you need at least a cat 5e cable to router, router needs to support 1Gbps bandwidth, cable from router to nas needs to be at least cat 5e and your nic on nas needs to support 1Gbps as well.
So check the spec's on each device and replace the bottleneck because I doubt you can find regular cat 5 unless you tried really hard :)
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Implementing RAID 1 in Windows Server 2003 using VMware!


This is a simple tutorial about creating a RAID 1 in VMware for IT people. VMware, well I think you know already about Server Virtualization.Its a well known product.
Let's discuss about some of the techniques related to Load Balancing or Fault Tolerance.....The Disks here used are Dynamic Disks.
RAID - Reduddant Array of Independant (Not much Inexpensive these days. That term suites no more) Disks. There are two types of RAID:
  1. Software RAID - Implemented via the OS or with the help of a Software. Not much efficient however.
  2. Hardware RAID - Hardware level RAID. Much more efficient and Fault Tolerant.

The idea to use a set of disks or an array is to increase the performance (Load balancing) and provide Disaster Recovery (Folt Tollerant).
RAID 0 - StripingThe fastes of all the RAID configurations. This is known as Striping. Striping is the process of Writing data Sequentially to or Read from more than a single Hard Drive (or a Storage Device).First the data is broken up into chunks or blocks. Then the writing process will be accomplished. The process of writing will be done Simultaneosly onto Strips. The performance of reading and writing increases because all the Heads are working all the time
RAID 1 - Mirroring,DuplexingAs the name implies, it creates a Mirror of one Disk onto another. Data will be written to Both the Disks. So if one disk fails other one can be mounted or it can be used to Restore data.There can be a deadlock how ever. The Disk Controller. RAID 1 uses a Single Disk Controller thus a Single point of failure.We can avoid this easilly with the use of Disk Duplexing which means usage of 2 Disk Controllers.
RAID 2 - Striping with ParityThis is similar to RAID1 but with an added feature known as Parity. One disk - typically the last one - is used to store somethings called Parity bits. With the use of these Parity Bits, the lost data can be easilly generated. This uses Logical XOR Operation. When writing, it XORs every data written onto HDDs and stores in the Parity Disk. When one Disk fails, thet PD is XORed with other Data bits on the functioning Hard Drives. This is a very effective technology in terms of Fault Tolerance. But Performance is pretty low.
RAID 3Similar to RAID 2 but instead of using Strips which are in Bits this technique uses Strips in Bytes. That increases the performance over RAID2.
RAID 4Strips data (Blocks) and uses a Parity Disk. Requires at least 3 Drives. Not widely used.
RAID 5The most popular method. Requires at least 3 Disks. Disks are used to store Parity data as well for each perticular drive. Data Stiped in Bytes (uses block-level striping with parity). Supports Unlimited number of Drives. Failure rate Drops when the number of devices increas.High speed reads can be performed. But writing is pretty slow in this approach.
Note: The non-standard RAID levels 5E, 5EE and 6E extend RAID 5 and 6 with hot-spare drives. Other non-standard RAID levels include: RAID 1.5, RAID 7, RAID-DP, RAID S or parity RAID, Matrix RAID, RAID-K, RAID-Z, RAIDn, Linux MD RAID 10, IBM ServeRAID 1E, unRAID, and Drobo BeyondRAID.
So how are we going to implement such a structure in VMware?That is quite easy. This is an example of Disk Mirroring. Each disk has to have Similar Capacity.
  1. Click on "Edit Virtual Machine Settings".
  2. Click on Add ->Next-> Create new Hard Disk.
  3. Select SCSi.
  4. Give a Suitable Disk Capacity for new Disk.
  5. Give a "Name" and Browse the storage location.
  6. Click on Finish.
  7. You have to Repeat the steps to create the number of Disks that you require. You have to have 2 Disks. Do not use the Main Drive. Use Separate Disks.
  8. Click on OK.
  9. Click on "Power on this Virtual Machine".
  10. After booting up the machine, its the time to implement the Mirrors.
  11. Log in.
  12. Right click on My Computer and select "Manage".
  13. Click on "Disk Management".
  14. Get the "Convert Disk Wizard".
  15. Select the 2 disks (tick on the check boxes).
  16. Click "Next -> Finish
  • Implementing RAID1
  1. Right click on the Disk n which your first added drive (n = the number).
  2. Select "New Volume".
  3. Select the option "Mirrored".
  4. Click on "Next".
  5. Add the Disks from the left hand list box to the right hand list box (the two drives that you have created).
  6. Click on "Next".
  7. Assign a Drive Letter.
  8. Format using NTFS. Make sure you provide a "Volume Label".
  9. That's all what you need to do!
  10. Wait until the Volumes get formatted and Synchronize.
  11. Implementation of the other technologies are similar to the above procedure.
Hope you would enjoy this tutorial.Thanks!
-Lasitha

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1 Answer

Backup slow


Hi,
You don't specify whether previously on your USB it was the same lacie external or whether it was a different external drive. It sounds like you were using a different external drive, most likely a single drive.
You've specified that you've got your lacie setup in raid 5. Raid 5 gives a very good read spead and a good redundancy for incase a drive fails, however it's write speed is very very slow.
It will be much slower than a single drive on USB for writing to it (i.e. backups), but you should see a huge performance boost in reading from the drive than your previous usb.
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Raid 10: striping + mirror . half the drives are striped (like above), but the other half mirror the striping half so if one drive fails there's a backup of it. You only get half the disk space though, so if you have 4 x 1Tb drives, then you'll only get 2Tb of space.

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If you really need huge storage capacity, go for a 'standard' storage server (supermicro for instance) that can store 24 or more disks... You have them in several brands, and the SuperMicro ones aren't that expensive.

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