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Possible to nondistructively grow large size UFS?
i'm using FreeBSD 6.4-RELEASE (latest freeNAS) booting from a USB drive. the storage is currently 4 drives of 1TB each in Raid 5 attached to an Areca ARC-1220 PCI-Express x8 SATA II Controller (~3TB usable). the controller supports 8 drives and Online RAID capacity expansion, so the plan is to add more 1TB drives as needed. I have recently added a fifth drive and increased the size of the raid to ~4TB, and now i need to resize the partition nondestructively (i.e. without loosing the data!). i am planing on following these instructions:
http://apps.sourceforge.ne
i was cautioned not to try to grow UFS file systems larger than 2TB (same link). is there anything in particular about large UFS that makes it unsafe to grow it? how likely is it that i'll be loosing my data if i go ahead and try this? although i have (almost) everything backed up, the perspective of having to fill up again the "new" drive if something goes wrong during growfs is not appealing.
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by: gheistPosted on 2009-01-03 at 00:38:35ID: 23284423
Probably there are some shared data structure that has to be resized when growing over 2TB.
FreeBSD's 7.0 manual lists such cases: http://www.freebsd.org/cgi
I have no idea how to free up first cylinder group, probably some UFS editor is of help displaying files in there to be copied and deleted after to get first cylinder group free.
Sounds dangerous anyway. Google references do look scary. You may ask in FreeNAS and FreeBSD forums for instance - it is more likely there is somebody who went thru process.
All I have done ever was resizing 36GB(SCSI RAID-5) into 160GB(SATA mirror) by copying image (system down for long) and resizing up last data partition (fsck before cleaned dirty things, was clean after resize) - kind of as I read now in manual - got lucky with clean cylinder group...
You should go for umount at least, probably even reboot into PC-BSD or maintenance mode of FreeBSD 7.0 disc1 (handbook tells how to use this mode)
fsck while fs umounted is worth doing before resizing if you *EVER* switched server off during its lifetime.