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тАО03-18-2003 12:10 PM
тАО03-18-2003 12:10 PM
va7100 LUN creation
Thanks in advance!!
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тАО03-18-2003 12:39 PM
тАО03-18-2003 12:39 PM
Re: va7100 LUN creation
Eugeny
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тАО03-18-2003 04:19 PM
тАО03-18-2003 04:19 PM
Re: va7100 LUN creation
I'm confused about Eugeny comment about C1 and C2. Eugeny, do you want all the reads and writes going through C1? Is this the two I/O port per one processor problem? Doesn't the best performance comes from properly load-balancing the I/Os across even and odd LUNs.
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тАО03-18-2003 10:02 PM
тАО03-18-2003 10:02 PM
Re: va7100 LUN creation
The issue will be with the large sequential write case. In AutoRAID mode, with the array close to full, you???ll either get good write performance, or really poor write performance. It???s hard to predict. The issue is with the log-structured writes. The VA, in the AutoRAID setting, will use log-structure RAID 5DP writes for a sequential write workload. Log-structured writes will provide good performance as long as there is contiguous free-space in the array. In theory, this workload will be ok. The free space will be created, as the data blocks are re-written (this is the reason I don???t want you to stripe the LUNs). The data will be allocated sequentially.
I???d also recommend you only allocate LUNs for 700GB. This will give the array more opportunity to have contiguous free space.
I also don???t think you???ll see much value in load balancing on the fibre channel/controllers.
Make sure you have HP18 firmware, and Prefetch Enabled (armmgr ???P On), and normal resiliency (armmgr -J Normal).
After the system is setup and running, look at the armperf ARRAY output. Verify that your system is using large >64K IOs. If not, track down why.
Let me know how it turns out.
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тАО03-19-2003 12:10 AM
тАО03-19-2003 12:10 AM
Re: va7100 LUN creation
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тАО03-19-2003 10:17 AM
тАО03-19-2003 10:17 AM
Re: va7100 LUN creation
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тАО03-19-2003 07:39 PM
тАО03-19-2003 07:39 PM
Re: va7100 LUN creation
You want a direct answer, well ok. Here it is. It depends. It depends on characteristics of your workload that you haven???t described ??? and possible you don???t know. So, try a configuration, and see how it works. Then modify it if necessary. Try the one LUN plan. After you???ve run the real workload for a couple of weeks, look at the performance logs. They will tell you the information you need if you decide to modify the system.
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тАО03-20-2003 08:17 AM
тАО03-20-2003 08:17 AM
Re: va7100 LUN creation
-Vince