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тАО02-23-2005 12:06 AM
тАО02-23-2005 12:06 AM
Replacing drives in an Array with pre-used drives
We have a number of old drives and would like to use them as spares but if they shouldn't be used with data still on them, then how can we format them so they effectively become "new" and ready for use ?
Also I have heard numerous rumours that data being rebuilt on a newly installed drive in an array can be lost by the recon drive copying its own data back across the array instead.
Can anyone confirm or refute this ?
Ay help or advice would be appreciated.
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тАО02-23-2005 01:35 AM
тАО02-23-2005 01:35 AM
Re: Replacing drives in an Array with pre-used drives
what OS are you using?
Under HP for example you would at some point run a newfs before adding the disk into a RAID. So when you add the disk YOU determine which is the original and which is the secondary.
Regards
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тАО02-23-2005 01:43 AM
тАО02-23-2005 01:43 AM
Re: Replacing drives in an Array with pre-used drives
All drive arrays are connected via a controller such as 3200/5400/6400
As the Arrays are being rebuilt at a hardware level the O/s is almost irrelevant. My concern is that the hardware firmware won't be able to distinguish between old data and new data when old data exists.
Similarly as the old drives also had SCSI Id's assigned at what point is this erased ?
So basically, If I insert a drive from part of an old array as a replacement for a failed drive in a new array is there any danger to the data in that new array ?
has anyone had experience of this causing a problem ?
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тАО02-23-2005 02:26 AM
тАО02-23-2005 02:26 AM
Re: Replacing drives in an Array with pre-used drives
The SCSI ID is not recorded on the disk - it is provided by the backplane connector.
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тАО02-23-2005 02:51 AM
тАО02-23-2005 02:51 AM
Re: Replacing drives in an Array with pre-used drives
anyone else.....
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тАО02-23-2005 06:14 PM
тАО02-23-2005 06:14 PM
Re: Replacing drives in an Array with pre-used drives
I.e a singel disk with a singel volume will contain valid smart-controller data. As so, the Smart controller would "import" it.
If the singel where used as part of a Smart controller array, the smart would still se that the disk is supposed to be member of a array with som other disk that are not present.
The last time I checked with HP (Some years ago now), they only supported "unconfigured" disks. This does not mean that it would not work, but they surtenly would not do any testing on this.
However, if you have access to a Smart controller you can easely removed the "array configuration" data from the disk (if present). The Smart controller will "import" the disk as a broken array. If you delete the broken array, you'll also remove this information from the disk(s).
Hopfully this helps you somewhat?
KurtG