quotas safe on >2 TB filesystems in 6.1-RELEASE ?

Miroslav Lachman 000.fbsd at quip.cz
Wed Dec 20 09:28:14 PST 2006

Eric Anderson wrote:
>> Hmmm...the time required is more dependent on inodes
>> than on size of data / size of files, right ?
>> My 9 TB dataset uses about 36 million inodes.
>> Any comments on that number ?  Large ?  Pedestrian ? Typical ?
> Sounds like you have a lot of larger files (~250k per file on average 
> possibly), which helps the fsck times.  36 million inodes should be 
> fsck'able with enough memory (maybe ~3gb ish? That's a wild guess).  I 
> have two 10Tb file systems, one has 180million inodes.  I don't attempt 
> to fsck it, because it would take a very long time, and I might possibly 
> run out of memory (I have 8Gb of memory).  I use GJOURNAL on these, and 
> am very happy about it (thanks Pawel!).

How can I calculate required memory? Some time ago I have problems with 
background fsck (snapshots?) on FreeBSD 6.0 with 1.2TB SCSI array 
(kernel panic).
Then I set background_fsck="NO" and foreground fsck is running well. But 
I don't know how much memory is needed for:
/dev/da1s1d 1132570308 514379258 561562536    48%   12456 146363222 0% 

real memory  = 2147401728 (2047 MB)
avail memory = 2096431104 (1999 MB)

# swapinfo
Device          1K-blocks     Used    Avail Capacity
/dev/da0s1b       4194304        0  4194304     0%

Can swap be used in time of fscking disc, or only "real" memory is used?

Miroslav Lachman

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