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тАО01-05-2010 09:25 AM
тАО01-05-2010 09:25 AM
convert Raid5 to Raid 1+0 on HP E200
I have a HP E200 controller with the 128MB cache in my ML150 G3 server.
I have two raid volume...
- 1 x Raid 1 with two drives
- 1 x Raid 5 with three drives
there is one drive left as a spare for both raid volumes. All drives are identical...
is it possible to convert the raid 5 volume to raid 1+0 (using 4 drives)?
Right now, the HP ACU only allows me to convert to Raid0... but if I do this, will I be able to convert to Raid 1+0 after that?
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тАО01-05-2010 12:34 PM
тАО01-05-2010 12:34 PM
Re: convert Raid5 to Raid 1+0 on HP E200
add the 4th disk to the array (Expand) then migrate to 1+0.
First you have to remove the spare from both arrays.
BR
/jag
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тАО01-06-2010 07:58 PM
тАО01-06-2010 07:58 PM
Re: convert Raid5 to Raid 1+0 on HP E200
how much time could it take to expand my raid5 (currently with 3x250Gb sata drives) to 4 drives?
Will it slow down normal operations on the server?
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тАО01-13-2010 01:29 AM
тАО01-13-2010 01:29 AM
Re: convert Raid5 to Raid 1+0 on HP E200
I have been busy.
I don't know how long it will take.
But HP say rebuild can take up 15 min/GB. In worst case.
I believe it could take 1 - 2 days.
Unless you have a very high load on you disk system, you shouldn't see a performance impact.
I would do it in a weekend anyway.
ps.
You might need to buy a Cache battery for the e200 to be able to do a RAID level migration.
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тАО01-13-2010 08:42 AM
тАО01-13-2010 08:42 AM
Re: convert Raid5 to Raid 1+0 on HP E200
the current volume is 3x250Go Raid 5...
so if it really takes 15mins/GB, it could take in my case more than 115 hours...
I really hope it will be a lot less than that.
Or is it 15mins/GB for real data and not complete volume? If it's the case, I have 160GB worth of data... it will be faster if the raid controller only needs to "work" where there is some data.
I have a 128MB cache on my E200... so I should be ok.
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тАО01-14-2010 12:29 AM
тАО01-14-2010 12:29 AM
Re: convert Raid5 to Raid 1+0 on HP E200
15 min/GB is worst case.
So, these modern large drives do have a downside.
regarding the cache. You might have to buy a cache battery, to enable the migration option.
It is being mention often, on itrc forum, that the e and P model smart array controlers need a to enable write cache to perform a RAID level migration.
And to enable write cache, you need a battery, also known as BBWC (Battery Backed Write Cache).
BR.
/jag