jhenderson
Site Admin
Joined: 07 Mar 2006
Posts: 2267
Location: So. Cal. USA
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 Posted: Mon Jul 20, 2009 3:05 pm Post subject: Raid configuration for Andale |
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| Quote: | On your Andale system the fastest one supports 1000 MB/Sec. How many disks are needed in the raid array?
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Currently, Andale has been tested only with eight and sixteen-drive configurations, with one or two controllers, respectively. The eight-drive system yields at least 750 MB/s sustained, whereas the sixteen-drive system sustains 1500 MB/s. It is probably the case that this will scale upwards with more drives and controllers, but this seems beyond the point of diminishing returns.
Our X5-cards are currently limited to about 1200 MB/s sustained per card, due to our v1.0 PCIe implementation. Our next series of cards will implement PCIe v2.0, which will double this rate, but they have not hit production yet.
| Quote: | | Are any other packaging options available other than rackmount? |
Andale can be packaged anyway a PC can be packaged. We can house the ATX server, disk controllers and X5 modules in one box, and tether via SFF connections to a JBOD. Or, it can all be packaged as we illustrate in a single, large rackmount. The Andale SW and architecture is agnostic to the packaging. For instance, we have used four, 220 MB/s flash drives in our eInstrumentPC to yield 800 MB/s in the small embedded PC to address a portable wireless capture app.
| Quote: | If I am using the X400M card what is the max data rate for capture/playback and both at the same time?
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Andale can also support bidirectional concurrent streaming (in and out). The available drives are partitioned into two logical volumes, one in, one out. The rates are limited only by the available drives and controllers (800 MB/s/eight drives+controller)
| Quote: | If I want to put the clockgen and X400M in a separate box with a PCie8X cable adaptor why is the speed 220 mBytes/sec, is it because of the PCIe cable card? What if I used another PCIe 8x cable host card and a different PCIe 8x cable target card?
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The single-lane Cabled PCI express (CPEX) interface on our DAQ-Node limits the rate to 220 MB/s. We have just completed development of an eight-lane CPEX XMC module, that allows connection to a 4:1 hub or to future x4 Nodes. But at present, if max speed is required, it's best to use either an eInstrumentPC with the module in the x8 slot, or a regular desktop or rackmount PC. |
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