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193519
April 27th, 2008 18:00
Global vs Dedicated hotspare
i have one 220S connected to two 2650's in split mode with PERC 4/DC on both systems. Its configured with raid 5 on both channels but i am trying to imlement a hotspare. I am torn between either a dedicated hotspare or a global hotspare. I guess my question is which one is better. Dedicated or global. What are the benefits and disadvantages of both. I dont want to have bot on each channels since it will be waste of hard drives.
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pcmeiners
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April 27th, 2008 18:00
Dedicated and global hotspare assignments are per controller, not between controllers, no choice in this senario.
luctec
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April 27th, 2008 22:00
at5147
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April 27th, 2008 23:00
Since you have two logical drives and they are attached to two different controllers, you can use either dedicated or global, that is if there are no other logical drives on the controller. If there are other logical drives on either 4/DC and you only want to the hotspare to cover only the logical drive on the PV, then it would need to be dedicated. If you want both logical drives on the PV to have hot spares you are going to have to have at least two hotspares, no way around that.
Global Hotspare - Will assume a rebuild on failure of other drive on the controller, not channel, granted the drive in question is the same size or larger for the logical drive it is attempting to rebuild into.
Dedicated Hotspare - All the same as above, expect it would be assigned to a specific logical drive on that controller, again channel not mattering.
luctec
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April 28th, 2008 09:00
So from what you are saying, if i have 28 drives on the controller(that is 14 drives per channel), i can have one global hotspare in as much as it is for that specific controller?
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Dev Mgr
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April 28th, 2008 12:00
So with a single PV220S in split mode and 2 separate servers each having 7 slots, each server needs a hotspare.
A global hotspare will take over for any failed drive on this server's raid controller. A dedicated hotspare is dedicated to a single raid set for this server's raid controller.
E.g. A server has a raid 1 and a raid 5 on the PV220S. A dedicated hotspare can be dedicated to either the raid 1 or raid 5 (can also have 2 hotspares; one per raid set). A global hotspare would only need a single disk and it would take over for a failed drive in either raid set.
luctec
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April 29th, 2008 01:00