LSI Cachecade Pro 2.0 with RAID10 SSD Cache?

Question

I'm trying to add a RAID10 SSD Cache to a VD by this command:

[root@livecd storcli]# ./storcli64 /c0 add vd cachecade type=r10 drives=252:4,252:5,252:6,252:7 assignvds=0
Controller = 0
Status = Failure
Description = Unsupported RAID level

In the reference of this storcli command, it says raid10 is possible but it doesn't allow me to create a RAID10 array for a cache.

storcli /cx add VD cachecade|cc
            Type=[0,1,10]
            drives=[e:]s|[e:]s-x|[e:]s-x,y
            [ < WT| WB> ] [assignvds=0,1,2]

Any ideas?

Is there any link where you found any info on lsi + ssd problems? I am in dire need, too. — sjas, Jan 02 '15 at 09:49

score 3 · Answer 1 · answered Dec 11 '13 at 18:15

3

It seems RAID1 with 4 SSDs means RAID10 in LSI's world. Here is a reply from LSI:

You would have to create your RAID 10 Cache Cade Volume in the BIOS and it will show as a RAID 1, but works as a RAID 10.

answered Dec 11 '13 at 18:15

ispirto

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Yeah, that's ugly. But why do you need FOUR Cachecade SSDs? – ewwhite Dec 11 '13 at 18:20
For better speeds :) – ispirto Dec 11 '13 at 18:31
1

That doesn't make sense. This is just read cache from SSD and *moar* doesn't necessarily mean better. There's a reason that the option for RAID 1+0 is not a mainline or obvious setting. It's not how these were designed to be used. – ewwhite Dec 11 '13 at 18:35
You can do RW caching with it. – ispirto Dec 11 '13 at 19:09

score 0 · Answer 2 · answered Dec 11 '13 at 14:38

0

Did you try type=10?

I believe that you can only use CacheCade SSDs in RAID 0 or RAID 1. I'm not sure why you'd need RAID 1+0, though. The upper limit to the caching size per controller is 512GB, no?

answered Dec 11 '13 at 14:38

ewwhite

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score 0 · Answer 3 · answered Mar 24 '17 at 19:25

use 4 ssds in MSM to create 1 cachecade drivegroup, select raid 1. There is no raid 10 option, however, the created drivegroup will appear to be 2x of single ssd size, and write back by default. I strongly believe it is indeed raid 10. p.s. you can also create 2 or more cachecade drivegroup, with ssd of different sizes, might be a better solution.

LSI Cachecade Pro 2.0 with RAID10 SSD Cache?

3 Answers3

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