Some of you may be interested in this PCIe card:
http://www.addonics.com/products/ad4mspx2.php
I just received a couple of them and have done basic functionality
testing. No bcache yet but that is what they are intended for. The
controller is a Marvell 88SE9230 connected via an x2 link.
03:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9230 PCIe
SATA 6Gb/s Controller (rev 10)
LnkCap: Port #0, Speed 5GT/s, Width x2, ASPM L0s L1,
Latency L0 <512ns, L1 <64us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain-
CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 5GT/s, Width x2, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt--
Kernel driver in use: ahci
Kernel modules: ahci
[8:0:0:0] disk ATA MKNSSDAT120GB-DX 521A /dev/sde
[9:0:0:0] disk ATA MKNSSDAT120GB-DX 507A /dev/sdf
So you are theoretically limited to less than 1GB/s across PCIe but for
caching purposes I'm more interested in IOPS than raw bandwidth
anyways. Using "dd if=/dev/zero of=/dev/sdX bs=1M oflag=direct" I am
seeing ~380MB/s per device on 2 Mushkin MKNSSDAT120GB-DX concurrently.
Not the greatest test but it does show that they work OK. I am getting
Fedora 20 installed the way I want it and then the real testing will begin.
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