Configure raid5 with cachecade

[ascoolasice79]

I have a Dell H710p Controller which is a rebranded LSI 9266-8i Raid-Controller with CacheCade 1.0 and 4x WD Green Drives and 1x 256GB Plextor M5Pro. I want to configure a Raid5 virtual volume with cachecade and I'm looking for the best configuration (Read/Write/IO/Disk Policy).

It's my first raid controller, so can you help me?

 

[Emulex]

tinkertry.com

it's pretty straightforward using MSM. Cachecade 1.0 is read only and if the ssd fails, it just falls back to normal mode. Cachecade 2.0 is read/write and if the ssd fails, bad mojo.

Just give it a shot, you usually have to play around with strip size to get optimal performance for your specific application. RAID-5 is going to suck on writes, but is fastest on reading. So cachecade read-only mode may not do miracles.

remember the speed of the ssd will limit the raid-5 behind it. ie if the 4 green drives can outrun that one ssd, you may find latency your only gain or worst a cap on max linear reads.

Can you upgrade to read/write cachecade 2.0? That's where you'll see the write speeds go from horrific to okay.

Btw make sure you are using RE4-GREEN drives, that controller will throw regular consumer drives in the trash so fast it's not funny.