TechGuy_007
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Resizing PERC5i array, RAID5
Our PowerEdge 2950 is nearly out of space. Currently there are three SAS drives, each 160ish GB in a RAID 5 array. What are my options? I've thought about adding a 4th disk to the array (if possible) or even ghosting the image and then replacing all three drives with bigger ones, if that would even work to begin with. Thanks!
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I don't know what this means but it might help...
"go to OMSA, Storage, PERC, Virtual Disks, choose Reconfigure from the dropdown menu for your RAID 5, follow the wizard to add the disk." (OMSA = openmanage server administrator)
Note Dell controllers aren't as flexible as HP ones, you can't add disks to a container that has two logical disks on it and you can't replace small disks with larger ones. Also generically be aware that you may be limited by the OS, for example you can't expand a windows MBR disk past 2TB although there is 3rd party software that will convert it to MBR without data loss that you can buy.
"go to OMSA, Storage, PERC, Virtual Disks, choose Reconfigure from the dropdown menu for your RAID 5, follow the wizard to add the disk." (OMSA = openmanage server administrator)
Note Dell controllers aren't as flexible as HP ones, you can't add disks to a container that has two logical disks on it and you can't replace small disks with larger ones. Also generically be aware that you may be limited by the OS, for example you can't expand a windows MBR disk past 2TB although there is 3rd party software that will convert it to MBR without data loss that you can buy.
Thanks andyalder. I didn't think they would be.
TechGuy_007: As per above try that. Unfortunately each RAID manufacturer has their own tools and limitations. Most should have the ability to expand the Array and if the OSMA allows it it's probably the only (easy) way to go.
TechGuy_007: As per above try that. Unfortunately each RAID manufacturer has their own tools and limitations. Most should have the ability to expand the Array and if the OSMA allows it it's probably the only (easy) way to go.
With this controller, there should be no issue adding a drive to a raid 5. If this was a multi-level array(raid 10, 50), I would recommend against it even though it is supported. As just a raid 5, there shouldn't be an issue.
If that is not enough space, then your thought about imaging would be the better way to add larger drives. Get a good image. Test it. Swap all the drives and make your new larger raid. Slap the image on and go.
I would HIGHLY recommend NOT rebuilding in a larger drive 1 at a time for more space. First, doing three forced fails with three rebuilds is three chances to have major failures. Second, if you splice a second array onto the same physical disks, a lot of wacky things can happen to a raid array. I have personally seen setups like this work great for years and never be an issue. I have also personally seen these work great for years until a drive fails and then lose both arrays. It is recommended for just about any raid controller to only have one array on any given physical disk.
If that is not enough space, then your thought about imaging would be the better way to add larger drives. Get a good image. Test it. Swap all the drives and make your new larger raid. Slap the image on and go.
I would HIGHLY recommend NOT rebuilding in a larger drive 1 at a time for more space. First, doing three forced fails with three rebuilds is three chances to have major failures. Second, if you splice a second array onto the same physical disks, a lot of wacky things can happen to a raid array. I have personally seen setups like this work great for years and never be an issue. I have also personally seen these work great for years until a drive fails and then lose both arrays. It is recommended for just about any raid controller to only have one array on any given physical disk.
If you have the space to create a backup of your current array and can afford the down-time, I would go with the backup/replace drives/restore option.
Hope this helps.