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тАО07-23-2004 07:45 AM
тАО07-23-2004 07:45 AM
Adding drives to a VA7400: Performance Implications
I now plan to add 10 more 73GB drives (5 in each RG), and create two new LUNs. My question:
Bearing in mind that this is RAID1+0, will the two new LUNs each be striped across just four 73GB drives (one 73GB drive in each RG being reserved as a hot spare) ? This appears likely if the LUN-to-drive mapping is static and determined at LUN creation time. This implies performance for the new LUNs will be inferior to the existing LUNs.
Looking for corroboration or refutation ... thanks.
Raghav
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тАО07-25-2004 02:01 PM
тАО07-25-2004 02:01 PM
Re: Adding drives to a VA7400: Performance Implications
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тАО07-26-2004 12:38 AM
тАО07-26-2004 12:38 AM
Re: Adding drives to a VA7400: Performance Implications
Thanks for the response. Your reply indicates that existing LUNs are re-mapped when when new disks are added, which is entirely possible. However, I'd feel a little more comfortable if you can point me to HP documentation that confirms this.
And yes, I use a queue depth of 32 for the LUNs on this array. Most of our other VAs are configured with multiple LUNs ... this particular array is an exception.
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тАО07-26-2004 03:17 AM
тАО07-26-2004 03:17 AM
Re: Adding drives to a VA7400: Performance Implications
In the absence of HP-authorized documentation, I'll have to go with the HP-employed engineer.
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тАО07-26-2004 06:12 PM
тАО07-26-2004 06:12 PM
Re: Adding drives to a VA7400: Performance Implications
It says:
""The HP virtual array accepts new disks while the array is up and running and accepting I/Os as with some higher-end traditional arrays. However, the HP virtual array takes it one step further. Once the disk is inserted, the array automatically includes that disk into the existing disk space and stripes all LUNs across that disk. This means that even without the creation of any additional LUNs, the array performance will improve because of the additional available spindle. Only the HP virtual array automatically adds the new disks to existing LUNs. Further, any newly created LUNs are also automatically spread across all the disks in the array, including the additional disk.""
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тАО07-27-2004 02:45 AM
тАО07-27-2004 02:45 AM
Re: Adding drives to a VA7400: Performance Implications
These are the same rules that a storage expert would use to optimize an application├в s
performance. In addition, like an expert storage administrator, any changes to the
configuration are made only during low-usage periods or when disks are added. Note:
when disks are added, the existing LUNs are automatically extended across the new disks.
This normally requires data movement within the array. However, administrators have the
option to postpone this data movement by simply turning off the array├в s ├в Auto-Include├в
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тАО07-27-2004 02:46 AM
тАО07-27-2004 02:46 AM
Re: Adding drives to a VA7400: Performance Implications
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тАО07-27-2004 02:53 AM
тАО07-27-2004 02:53 AM
Re: Adding drives to a VA7400: Performance Implications
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тАО07-27-2004 03:19 AM
тАО07-27-2004 03:19 AM