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Post by wolfpack on Jul 23, 2007 20:15:55 GMT 7
Hi everybody!
I think it would be really nice if there was the possibility to downgrade the raid from Raid5/6 to JBOD for maintenance purposes.
For example a hard drive upgrade would be much easier: My plan is to replace my Raid5-Array with 5x500G HDDs by 5x1000G HDDs AND change the stripe size.
At the moment I have no possibility to backup all my data and "destroy" the Raid5, so I won't be able anyways to change the stripe size or get around the long rebuilding time.
If a Raid-Downgrade is possible, I can simply remove the drives, check in the new ones, connect the old disks to my computer and copy the data... or even better: put them in a USB-Cover, connect them to the front panel and use the copy function.
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Post by peterfu on Jul 26, 2007 19:35:31 GMT 7
If a Raid-Downgrade is possible, I can simply remove the drives, check in the new ones, connect the old disks to my computer and copy the data... or even better: put them in a USB-Cover, connect them to the front panel and use the copy function. I don't think that this will work, cause the N5200 uses LVM to put the disks together to one logical volume and this logical volume is then mounted as /raid/data. So the best way in Your case - at least in my opinion - would be to use 1 or 2 of the 10000G HDD's as backup disks and backup all your data there, then remove the 500GB disks and build a new RAID5 with the remaining 1000G HDD's - put back the data to the N5200, backup them on the now free 500G HDD's and make the the RAID migration with the now free 1000G HDD's. I always do backups of my N5200 to another system - thsi one without RAID, but it hepls if the N5200 crashes, or access is not possible any more. br Peter |
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Post by wolfpack on Jul 27, 2007 2:58:58 GMT 7
If a Raid-Downgrade is possible, I can simply remove the drives, check in the new ones, connect the old disks to my computer and copy the data... or even better: put them in a USB-Cover, connect them to the front panel and use the copy function. I don't think that this will work, cause the N5200 uses LVM to put the disks together to one logical volume and this logical volume is then mounted as /raid/data. So the best way in Your case - at least in my opinion - would be to use 1 or 2 of the 10000G HDD's as backup disks and backup all your data there, then remove the 500GB disks and build a new RAID5 with the remaining 1000G HDD's - put back the data to the N5200, backup them on the now free 500G HDD's and make the the RAID migration with the now free 1000G HDD's. I always do backups of my N5200 to another system - thsi one without RAID, but it hepls if the N5200 crashes, or access is not possible any more. br Peter I fear this really is the only solution! :-( Sounds to me like "alotofwastedtime"... too bad. You know how long raid expansion takes... hope my girlfriend doesn't mind if I set the alarm clock to 4am for running down in the cellar and changing harddisks... ;D "If you get up NOW, nerd, you don't have to come back again - get on the couch!" |
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Post by peterfu on Jul 27, 2007 3:43:37 GMT 7
I have done this job 2 times now - and yes - it takes a lot of time.
br
peter
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