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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 ?
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.
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.
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