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тАО06-12-2009 03:41 PM
тАО06-12-2009 03:41 PM
What would you consider a RAID-10 volume that is "too large"?
TIA!
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тАО06-13-2009 12:13 AM
тАО06-13-2009 12:13 AM
Re: What would you consider a RAID-10 volume that is "too large"?
If you're moving to an EVA, then the concepts of RAID-10 that you're familiar with on the SmartArray, aren't particularly relevant...
For a small system like you're proposing, then data would be automatically distributed across all the spindles on the EVA, so you should see a performance boost there, plus the increased cache will help.
How is the storage currently laid out on the SmartArray controller ?
Cheers,
Rob
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тАО06-13-2009 11:19 AM
тАО06-13-2009 11:19 AM
Re: What would you consider a RAID-10 volume that is "too large"?
Each SSD can do thounsands of operations per second, while a mechanical disk maxes out at 160.
Of course you can also have FC drives, or even FATA drives on the same EVA to store less frequently accessed data.
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тАО06-14-2009 06:09 AM
тАО06-14-2009 06:09 AM
Re: What would you consider a RAID-10 volume that is "too large"?
the EVA doesn't handle their VRAIDs like a traditional RAID controller (for example the Smart Array Controllers). A Vdisks is distributed over all disks in a disk group. If you have a 1 GB VRAID 1 Vdisks it's distributed over all disks in a disk group, even if the diskgroup has 240 drives. In this case every disk would hold 1/240 of the 1 GB Vdisk. More disks = more performance. The EVA will boost your application performance noticeable.
As vcespon already wrote: Maybe SSDs are an interesting option for you. But you need at least an EVA4400 and you can only put up to 8 SSDs into one EVA. It's only an option if you need less then 460 GB for you application. This is because you can plug only up to 8 72 GB SSDs into one EVA and you only can use VRAID 5. If you need more diskspace for your application, you have to use normal FC drives. You should use 15k drives and use more small drives instead of fewer bigger dissk.
Best regards,
Patrick
Patrick
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тАО06-21-2009 04:37 AM
тАО06-21-2009 04:37 AM
Re: What would you consider a RAID-10 volume that is "too large"?
Rob, to answer your question, the MSA30/SmartArray setup was a single RAID10 array composed of 14 @ 73GB 15K RPM drives split across two SCSI channels. At the HPUX level, this was a single large filesystem. The customers database is only about 100GB, but their I/O rate is insane.
The suggestion to look into SSD's is a very good one. I'm a little skittish, however, after reading some information about the load-levelling algorithms in Intel's high-performance SSD's that would actually cause them to become *slower* over time, to the point that they eventually got slower than regular laptop harddrives.
We actually are going to be using Fibre drives in the EVA model the customer purchased to maximize performance.
So, I guess my next question would be "how should I set the drives up to maximize performance"? Being rather ignorant of how to configure EVA's, it seems the language that I'm used to communicating with (i.e. hard arrays on physical controllers) doesn't make as much sense in the SAN space.
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тАО06-21-2009 08:08 AM
тАО06-21-2009 08:08 AM
Re: What would you consider a RAID-10 volume that is "too large"?
The ones from Intel are not bad, but internally are different, they are MLC with a 64 MB RAM cache, not SLC. SLC drives can sustain 10 times more write cycles than MLC and speed does not degrade with age. Also, all SSD have a 5% or so of extra space to replace sectors when they no longer work as expected.
Also, consider that a SSD is less likely to fail, as it has no moving parts and does not get very hot like a 15K drive. They even can warn when their lifespan is about to end, and be proactively replaced. I still don't know what will be HP's policy regarding this, no SSD has reached that point yet.
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тАО06-21-2009 10:50 PM
тАО06-21-2009 10:50 PM
Re: What would you consider a RAID-10 volume that is "too large"?
As you need only 100GB of space, than you can think about Texsas Memory Systems (www.suuperssd.com) RamSan400, whic can be equpied up to 128GB of Dynamic RAM, not Flash. RS400 can reach up to 600K IOPs.
Simon