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43031
October 13th, 2012 12:00
R720 server H710P controller cachecade?
Hi,
I have a raid configuration that I have one 100 GB SSD Driver (Dell Certified). I want to ask how redundant it will be if I only put one SSD drive to cachecade. I know SSDs are more resilient to errors but is there any raid1 configuration for cachecade? (using raid1 for 2 ssd drive). As far as I have seen from different documents or youtube videos CacheCade only concatenates ssd drives. What do you suggest what is the best practice here. Because if I am to lose that ssd i may lose data.
Is this cachecade just like Nvram on raid controller ? On H710p there is 1 GB of NV cache. 1 GB is recoverable but 100 gb of cache may affect all files on raid
Regards.
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pcmeiners
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1.8K Posts
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October 13th, 2012 15:00
I searched Google for 30 minutes and found this, I find it hard that few ask your question, nor is it answerd in the technical documents I found, primarily at the LSI site.....
www.webhostingtalk.com/showthread.php
Yes you can lose data .....
"-> CacheCade volume set up for read caching only will result in no data loss if a CacheCade SSD fails
-> CacheCade volume set up for read & write caching with a non-redundant (single SSD or RAID 0) will result in data loss with a failed SSD
-> CacheCade volume set up for read & write caching with a redundant (RAID 1) will result in no data loss in the event of an SSD failure"
Except in the case of a read only data server or write caching disabled on the server(, both rare setups), I would go with a redundant Cachecade SSD setup (raid 1), or your asking for data loss eventually
Stephan-thevalley
2 Intern
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130 Posts
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October 15th, 2012 09:00
The CacheCade on the H700 and H710 cards is read only cache only. (cachecade v1.0)
Lsi cachecade 2.0 isn't available on the dell cards, so no need for raid1.
stokinfo
2 Posts
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October 16th, 2012 00:00
I see. This is a software only (firmware) property. Any chance that Dell will integrate cachecade 2.0 to H710P cards? If so I can put a raid1 ssd and enable write cache when firmware comes out without risking it on production
M_Fischer
1 Message
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October 17th, 2012 01:00
Too bad. I thought there is cachecade 2.0 on this controller. The similiar LSI controllers already got a firmware update. Is it possible to flash the H710p with a LSI firmware?