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тАО08-15-2008 05:41 AM
тАО08-15-2008 05:41 AM
RAID 5 re-configuration - approximate time for array rebuild?
I have a ProLiant ML370 G4 (running SBS 2003 SP1) with Smart Array 642 controlling 3 x 72GB Ultra 320 15K rpm disks. I'd like to add a further 2 x 72GB disks to the same array (increase the logical drive size). I will be using the HP Array Configuration Utility to reconfigure the array.
I'd appreciate any thoughts / comments on the approximate length of time it will take the system to expand the array - as I'm assuming the disk system will slow done substantially during the array rebuild (expansion) process.
Many thanks,
Nick
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тАО08-15-2008 07:01 AM
тАО08-15-2008 07:01 AM
Re: RAID 5 re-configuration - approximate time for array rebuild?
The extension process takes about 15 minutes per gigabyte, or considerably longer if
the controller does not have a battery-backed cache.
Kind regards,
Predrag
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тАО08-15-2008 07:50 AM
тАО08-15-2008 07:50 AM
Re: RAID 5 re-configuration - approximate time for array rebuild?
the process to calculate the time depends on several factors.
<
- you can go to acu -> array or controller settings - there is an option to prioritize the expansion process.
This means if you will not have high I/O requests to the controller you can set the expand priority to "High" and this will use the controler resources mainly for the expansion while the i/o request will be hndled with lower priority.
Regards
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тАО08-15-2008 07:56 AM
тАО08-15-2008 07:56 AM
Re: RAID 5 re-configuration - approximate time for array rebuild?
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тАО08-18-2008 08:27 AM
тАО08-18-2008 08:27 AM
Re: RAID 5 re-configuration - approximate time for array rebuild?
found the document accidentally
Raid 5 rebuild performance in ProLiant
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00419664/c00419664.pdf