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CacheCade does it work?

Z

zer0gravity

[H]ard|Gawd
Joined
Dec 8, 2008
Messages
1,133
Hi,

My current setup is a Dell dell MD3600i and MD1200 with 18x2TB 7200 SAS drives. It is all connected via a DellH700 Raid card that supports CacheCade and want to know if adding an SSD would show any increase in access time as that seems to be one of the issues. I also have been reading and trying to figure out if it will support 256gb or 512gb max as well, but can't find a definitive answer.

Anyone used similar hardware or the Dell H700 and have any advice on whether or not CacheCade is a good option. My current SSD's to use are either a 256gb or 512gb Samsung 840PRO.

Thanks!
 
CacheCade or CacheCade 2.0? The SSD Review did a review on a CacheCade 1.0 card and saw good results, just keep in mind that 1.0 only does read caching. They also say it supports 512GB max and they used 2x 256GB crucials for their test. If I were to link to it the end of the link would be /raid-enterprise/lsi-cachecade-performance-analysis/. However I will not be linking to it as these forums tend to eat those links.

Ed: I'll give you this link so you can find it easier: http://lmgtfy.com/?q=the+ssd+review+cachecade

Ed2: On second look it seems that CC 2.0 was an upgrade to CC 1.0 so you should be able to do CC 2.0 on yours, the CC 2.0 review states it still has a 512GB limitation and the LSI CC Pro 2.0 page echoes that spec. I had originally thought that different cards supported different CC versions but now I'm not sure the way it is on their site is a bit confusing... I can't tell right away for that particular card as I don't know what LSI model it's equivalent too and don't care enough right now to figure it out.
 
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I'm not sure how cachecade works with reading the metadata (that's what would speed up access times, but it dramatically speeds up file access with recently written/read files. I've gotten close to 1GB/s on and off a CacheCade-enabled array, and it only did about 600MB/s when I ran a write/read test that was far bigger than the SSDs could support.

One other thing I'd recommend: choke down the SSDs with HDAT2. We took 256GB SSDs and made them appear to be 200GB SSDs so that they could have more space for dead cells which occurs, especially when you use consumer SSDs within a enterprise server.
 
As I understand it CC is block level so it doesn't distinguish between metadata and file data, so if a particular metadata block is one of the "hot blocks" then it should be cached.

I'm guessing CC doesn't let you only partially allocate a SSD for the cache, which is a nice feature in the Adaptec version.

Either way for $270 (may be able to get it cheaper if you shop around) I'd say it would be well worth it for a 512GB cache.

Have you read this?
 
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Yea got a 9271-8iCC off a member here and I am testing out some speeds.

Current setup RAID 5 18x2TB DELL H700
currenthhd.jpg



Test bed 4x256GB PRO RAID 0 LSI 9271-8iCC
lsiv.jpg



still need to test our current setup with CacheCade added.

Thanks!
 
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