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List:       zfs-discuss
Subject:    Re: [zfs-discuss] shrink the rpool zpool or increase rpool zpool
From:       Lori Alt <Lori.Alt () Sun ! COM>
Date:       2009-08-31 19:29:04
Message-ID: 4A9C2480.5050209 () Sun ! COM
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On 08/29/09 05:41, Robert Milkowski wrote:
> Casper.Dik@sun.com wrote:
>>> Randall Badilla wrote:
>>>    
>>>> Hi all:
>>>> First; it is possible modify the boot zpool rpool after OS 
>>>> installation...? I install the OS on the whole 72GB harddisk.. it 
>>>> is mirrored so If I want to decrease the rpool; for example resize 
>>>> to a 36GB slice it can be done?
>>>> As far I remember on UFS/SVM I was able to resize boot OS disk via 
>>>> detach mirror (so tranforming to one-way mirror); ajust the 
>>>> partitions then attach de mirror. After sync boot form the resized 
>>>> mirror; re-doing the resize on the remaining mirror and attach 
>>>> mirror and reboot.
>>>> Dowtime reduced to a reboot times.
>>>>
>>>>       
>>> Yes, you can follow same procedure with zfs (details will differ of 
>>> course).
>>>     
>>
>> You can actually change the partitions while you're using the slice.
>> But after changing the size of both slices you may need to reboot
>>
>> I've used it also when going from ufs to zfs for boot.
>>
>>   
>
> But the OP wants to decrease a slice size which if it would work at 
> all could lead to loss of data.
You can't decrease the size of a root pool this way (or any way, right 
now).  This is just a specific case of bug 4852783 (reduce pool 
capacity).  A fix for this is underway, but is not yet available.

Lori

>
>

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