Problems with Storage Spaces

I have a storage space with 10 drives, with over 10GB of free disk space in the pool. Occasionally, certain of my spaces are inaccessible, presumably because two drives intermittently fail; these two drives total2.5g of physical space.
I have retired the two drives, but storage spaces will not let me remove them. When I click remove it says : "cant remove the drive from the pool", "drive could not be removed because not
all data could be reallocated. Add an additional drive to this pool and reattempt this operation".
How can I address this problem?

Hi,
According to Storage Space FAQ, you could find the reason:
Why do I have a low capacity warning even though I still have unused pool capacity?
Storage Spaces provides advance notification of thinly provisioned storage spaces when the storage pool does not have enough capacity spread among a sufficient number of disks to continue to write new data. The default warning point is 70% capacity utilization.
To learn when Storage Spaces will generate a warning, consider the following example.
A two column, two-way mirror space that uses thin provisioning in a four disk pool
Two of the disks have 1TB capacity and two have 2TB capacity. Because a two column, two-way mirror space needs four disks (number_of_disks = NumberOfColumns * NumberOfDataCopies), it will evenly consume all four disks as it writes new data. When capacity
utilization of the two 1TB disks reaches 70%, Storage Spaces will warn of a low capacity condition. Even though the entire pool has 3.2TB free capacity, the thinly provisioned space will soon not be able to write any more data because the 1TB disks are nearly
fully consumed.
You can easily keep individual storage spaces’ low capacity warning synchronized with each other and with the pool by following the guidance in the next section, “How do I increase pool capacity?” from the moment of creating the pool and through all
subsequent expansions of the pool.
For more details, please refer to the link below:
Storage Spaces Frequently Asked Questions (FAQ):
http://social.technet.microsoft.com/wiki/contents/articles/11382.storage-spaces-frequently-asked-questions-faq.aspx
Roger Lu
TechNet Community Support

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Hello
I've finally resolved this and the resolution was relatively simple - and was also the main thing that Mark Rittman said he did in his article: reduce the size of the hash join.
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