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тАО08-05-2008 02:07 PM
тАО08-05-2008 02:07 PM
ML310 G5 Raid rebuild times.
I started the rebuild at 14:20 local time, now at 10:00, the following day, it shows 52% complete.
Does anyone have any experience on how long a SATA raid 1 rebuild on a 250GB drive should take?
It only took 75 minutes to created the array from the BIOS utility.
This machine is just sitting there with nothing else running on it. It's going live this weekend.
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тАО08-05-2008 07:05 PM
тАО08-05-2008 07:05 PM
Re: ML310 G5 Raid rebuild times.
are you using the HP SATA manager software to monitor that?
regards
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тАО08-06-2008 12:40 PM
тАО08-06-2008 12:40 PM
Re: ML310 G5 Raid rebuild times.
Given that an offline rebuild of the array only took 75 minutes, I know which one I'll be using in the future.
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тАО08-06-2008 02:21 PM
тАО08-06-2008 02:21 PM
Re: ML310 G5 Raid rebuild times.
the there is an option to enable cache that will increase the speed
my bad
regards
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тАО08-06-2008 08:25 PM
тАО08-06-2008 08:25 PM
Re: ML310 G5 Raid rebuild times.
the reason for the background operations are slower in all array controllers (storages included - e.g. MSA, EVA, XP) is that the high priority is always the IO. Thus the IO utilisation then impacts the speed of any background operation.
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тАО08-07-2008 03:54 PM
тАО08-07-2008 03:54 PM
Re: ML310 G5 Raid rebuild times.
I enabled it then pulled a drive and put it back in, after 16 minutes rebuild is 15% complete. Much better.
One question, is there an issue of enabling the write cache without some sort of independent battery backup?
I know most of the addon RAID cards have this as an option.
The server has dual power supplies and both will be plugged into different UPS's so not too worried about a power failure.
Also do you know what memory the system uses for the write cache? Is it system memory or memory on the drives?
Thank You
Doug
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тАО08-07-2008 05:34 PM
тАО08-07-2008 05:34 PM
Re: ML310 G5 Raid rebuild times.
cool the test you did I mean enable cache and rebuild HDD again ;-)
"One question, is there an issue of enabling the write cache without some sort of independent battery backup?"
yes when cache is enabled is recommended to have power redundancy - dual power supply or UPS, that's the recommendation from HP
so if the there is not power redundancy information in cache can be corrupted meaning data lost.
"Also do you know what memory the system uses for the write cache? Is it system memory or memory on the drives?"
this cache is located in the controller(part of the System Board) not in the HDDs
I hope this info can help you
anything else let me know
bye
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тАО08-07-2008 07:19 PM
тАО08-07-2008 07:19 PM
Re: ML310 G5 Raid rebuild times.
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тАО08-07-2008 07:19 PM
тАО08-07-2008 07:19 PM