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тАО10-27-2003 02:18 AM
тАО10-27-2003 02:18 AM
Is there a way we could migrate the array from a RAID0 to RAID5 without suffering any data loss???
Solved! Go to Solution.
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тАО10-27-2003 02:27 AM
тАО10-27-2003 02:27 AM
Re: Migrating from Raid0 to Raid5
RAID 0 allows 1,008 GB of available space, whereas RAID 5 will give between 792 and 936 GB of available space. Generally, you should backup the data on the array, and then restore it once you change the configuration to RAID 5. Some configurations MAY allow you to migrate, but I doubt it.
Either way, you should definitely backup the data before trying anything.
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тАО10-27-2003 02:47 AM
тАО10-27-2003 02:47 AM
Re: Migrating from Raid0 to Raid5
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тАО10-27-2003 11:32 AM
тАО10-27-2003 11:32 AM
Re: Migrating from Raid0 to Raid5
1) I think if I were doing something with a near terrabyte of data I'd probably do at least one backup first, irrespective of what the help facility said. Otherwise you too might be a previous colleague who now has left!!
2) Have a think about why you are using Raid-5. Writes will be slower that using Raid-0, due to overhead of calculating parity. There are pros and cons of each level of Raid, and in fact your best solution may be a combination of different raid levels for different data types. Typically high access databases benefit from R0+1. If it is all high volume stuff and read/write performance is not as important as availability the R5 may be the way to go. But RAID is never a substitute for backups...
3) If R5 is the best for you, you increase your availability more by having more than 1 R5 set - ie two R5 sets each with 7 disks, rather than 1 with 14. Assuming your data lends itself to it, of course.
That's my tuppence worth. All the best, PJ.
Peejay
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If it can't be done with a VT220, who needs it?
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тАО10-27-2003 11:44 AM
тАО10-27-2003 11:44 AM
Re: Migrating from Raid0 to Raid5
Rest applies though...
Peejay
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If it can't be done with a VT220, who needs it?
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тАО10-28-2003 12:53 PM
тАО10-28-2003 12:53 PM
SolutionYour best bet will be to upgrade to the most recent/stable versions of the array drivers and controller firmware, read everything you can about the Array Config Utility and what to expect, backup the system fully, and let it run over a weekend. I imagine that it's going to take a *long* time and that data access will be slow while the conversion takes place.
Oh, as was mentioned, since the amount of available disk space is going to decrease, you'll need to make sure that all of the existing disk space hasn't been allocated. If it has, you've got a whole separate set of problems to deal with since you OS will not be happy.
Good luck!
Seth
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тАО10-28-2003 11:55 PM
тАО10-28-2003 11:55 PM
Re: Migrating from Raid0 to Raid5
Wish me luck!!! ;-)
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тАО10-29-2003 10:44 PM
тАО10-29-2003 10:44 PM
Re: Migrating from Raid0 to Raid5
During a migration from RAID0 to RAID5 and the server crashes, will the migration restart when the server is brought back online?