Subject: Re: Replacing a disk in a RAID1 array. - msg#00532

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Re: Replacing a disk in a RAID1 array.

On Fri, 2003-12-19 at 11:43, Niall O Broin wrote: > On Friday 19 December 2003 11:25, Paul Kelly :: Blacknight Solutions wrote:> > > Don't you need to export the partition table from the working disk and > > import that onto the new one? And then raidhotadd would work? > > > > I've never done it (never had to, yet, fingers crossed) but I think > > that's what he's missing? > > No, he's not missing that - he (I) partitioned the replacement drive exactly > as the old drive. But somehow, the component needs to become part of the RAID > array. This is what mkraid does, but it destroys data. I need remkraid. There is "magic" written to the partition, by mkraid, which indicates what raid array the partition belongs to so if you remove /dev/sda from box 1 and put in box 2 as /dev/sdc then the raid array might not start? The information contained in this e-mail and in any attachments is confidential and is designated solely for the attention of the intended recipient(s). If you are not an intended recipient, you must not use, disclose, copy, distribute or retain this e-mail or any part thereof. If you have received this e-mail in error, please notify the sender by return e-mail and delete all copies of this e-mail from your computer system(s). Please direct any additional queries to: communications@xxxxxxxxxxxx Thank You. -- Irish Linux Users' Group http://www.linux.ie/mailman/listinfo/ilug/

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Re: Replacing a disk in a RAID1 array.

> > ... he (I) partitioned the replacement drive exactly as the old drive. > > But somehow, the component needs to become part of the RAID array. This > > is what mkraid does, but it destroys data. Afair the mkraid docs warn that mkraid destroys data, and you'd think it would, but what yr trying to do sounds exactly like the procedure given by an ibm guy in the Software Raid Howto. He gives instructions assuming you have one partition full of data, and you want to contruct an array by having another blank partition mirror the first. Have a read of the howto, and see if it fits the bill. I've created raid arrays in this manner before and haven't lost data, though almost all the manpages of the tools involved say that data loss is likely/inevitable. Heh, you can afford to risk it anyways, you have the other half of the old raid as a backup of sorts ;-) -- <HomerJ> 29 of the scariest nerds in Ireland i'd imagine. Homerj, describing a SAGE meeting, on #supporteers (irc.linux.ie) -- Irish Linux Users' Group http://www.linux.ie/mailman/listinfo/ilug/

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Re: Replacing a disk in a RAID1 array.

On Fri, 2003-12-19 at 11:43, Niall O Broin wrote: > On Friday 19 December 2003 11:25, Paul Kelly :: Blacknight Solutions wrote:> > > Don't you need to export the partition table from the working disk and > > import that onto the new one? And then raidhotadd would work? > > > > I've never done it (never had to, yet, fingers crossed) but I think > > that's what he's missing? > > No, he's not missing that - he (I) partitioned the replacement drive exactly > as the old drive. But somehow, the component needs to become part of the RAID > array. This is what mkraid does, but it destroys data. I need remkraid. There is "magic" written to the partition, by mkraid, which indicates what raid array the partition belongs to so if you remove /dev/sda from box 1 and put in box 2 as /dev/sdc then the raid array might not start? The information contained in this e-mail and in any attachments is confidential and is designated solely for the attention of the intended recipient(s). If you are not an intended recipient, you must not use, disclose, copy, distribute or retain this e-mail or any part thereof. If you have received this e-mail in error, please notify the sender by return e-mail and delete all copies of this e-mail from your computer system(s). Please direct any additional queries to: communications@xxxxxxxxxxxx Thank You. -- Irish Linux Users' Group http://www.linux.ie/mailman/listinfo/ilug/

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Re: Replacing a disk in a RAID1 array.

> > ... he (I) partitioned the replacement drive exactly as the old drive. > > But somehow, the component needs to become part of the RAID array. This > > is what mkraid does, but it destroys data. Afair the mkraid docs warn that mkraid destroys data, and you'd think it would, but what yr trying to do sounds exactly like the procedure given by an ibm guy in the Software Raid Howto. He gives instructions assuming you have one partition full of data, and you want to contruct an array by having another blank partition mirror the first. Have a read of the howto, and see if it fits the bill. I've created raid arrays in this manner before and haven't lost data, though almost all the manpages of the tools involved say that data loss is likely/inevitable. Heh, you can afford to risk it anyways, you have the other half of the old raid as a backup of sorts ;-) -- <HomerJ> 29 of the scariest nerds in Ireland i'd imagine. Homerj, describing a SAGE meeting, on #supporteers (irc.linux.ie) -- Irish Linux Users' Group http://www.linux.ie/mailman/listinfo/ilug/