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Slade

RAID Array Stripe size v. Windows default cluster size

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I have a RAID 5 array on an Adaptec 8805 (default stripe size used 256KB) that I just expanded by one additional 8TB He8 drive, all went well. 

But then I went into Windows disk management to expand the single volume of about 30TB by the additional 7.2TB.  I get an error that it can't happen because it exceeds the cluster limit of Windows.  I know that the default cluster size for Windows 7 for volumes of 16TB–32 TB is 8 KB and for 32TB–64 TB it doubles to 16 KB.  I expect that is the issue that I have, crossing that threshold exceeds the cluster number limit. 

Is there any simple way to change the cluster size, perhaps with third party software rather than to delete the existing volume and create it again with a larger value and then have to copy all the data back from the backup volumes?  Thanks.

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Just to follow up, I finally had the time over Thanksgiving week to move all the data to easier backup for restoration (then added an 8th drive figuring that I might as well go to RAID6 with all those 8TB drives), rebuilt the array and then made a new single large partition like I wanted with 16KB cluster size.  Only took about 3.5 days, then did the restoration of data from backup that went pretty quick over 10Gbit but did really notice the slower write speed of using RAID6.  One added benefit is that now my backup is more well organized and I have all the older backups as spare drives to use for something.  lol

Thanks again.

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