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Old 07-06-2009, 07:41 AM   #1
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Thumbs up How can I use hotspare Disk in RAID1

Hello everybody

I have server with 3 harddisk of 300Giga. I have did it with RAID1 and the third harddisk as a hotspare. My /var partition is 200Giga and the hotspare is 300GB. How can I extend my /var with this Hotspare ?

Thanks in advance.
Old 07-06-2009, 08:45 AM   #2
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I'm assuming your RAID 1 consists of 2x300GB drives and there is one hotspare of 300GB?
You can't just insert another 300GB into a RAID 1. If you had another, you could configure a second RAID 1 and if you had used LVM in our original partitioning scheme, you could grow your LVM by this 300GB.
Old 07-06-2009, 11:48 AM   #3
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The reason why you have a hot spare is in the case of a failure of one of the 2 disks in the RAID1 mirror. So do not use it or you will break the fail over it provides.

Instead, you can configure another RAID10 by adding 2 x 300GB disks. Or as suggested nowonmai, add 1 disk and do another RAID1 but in this case you are losing the benefits of the hot spare.
Old 07-06-2009, 02:35 PM   #4
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Hot spares for not for use with existing volumes.

This disk only is a backup disk for the 2 disks used in the volume.

it will kick in only if one of the disks fails and takes the failed disks position on the raid.

You cannot use a hot spare on an existing volume , to use a hot spare you need to remove it as a hot spare first before being used.

Once removed there wont be any host spare disk for failures.

Old 07-06-2009, 03:48 PM   #5
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Moved: This thread is more suitable in Hardware and has been moved accordingly to help your thread/question get the exposure it deserves.


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