Potential dangers with big arrays

2005-03-05 Thread Eric McCoy
I'm planning to build a fairly large - somewhere from 1TB to 1.75TB in 
size - array behind a hardware RAID controller and put FreeBSD on it. 
But after being a good boy and Googling for information before laying 
out a couple grand, I discovered that FreeBSD might not have such great 
support for large filesystems.  The last bit of useful information I 
found was from July 2004, so the situation might have changed since then 
and I figured I'd ask.

What sort of problems can I expect to see?  Aesthetic problems, like 
negative numbers in df, are not a worry.  The vast majority of files 
will be 1GB or smaller, so that's not a concern either.  But the guy who 
did those tests in July got no space left on device after using up 
only 800GB or so, and that obviously would be a problem.  Naturally I 
can, and will, test this myself when I get the hardware, but I'm 
concerned that there may be creeping invisible problems which might 
result in frequent panics or loss of data - problems which might not 
become apparent until after I've reached the point where I no longer 
have enough room to play musical chairs with my data (which will be 
about 400GB in).

Any information anyone has, even if it's just a pointer to who or where 
I should be asking instead, will be greatly appreciated.  Thanks.

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Re: Potential dangers with big arrays

2005-03-05 Thread Nick Pavlica
Eric,
  I believe that UFS2 (5.3+) will handle filesystems of that size
without a problem.  I would make sure however that your hardware plays
well with freebsd before you purchase it.

--Nick


On Sat, 05 Mar 2005 09:49:18 -0500, Eric McCoy [EMAIL PROTECTED] wrote:
 I'm planning to build a fairly large - somewhere from 1TB to 1.75TB in
 size - array behind a hardware RAID controller and put FreeBSD on it.
 But after being a good boy and Googling for information before laying
 out a couple grand, I discovered that FreeBSD might not have such great
 support for large filesystems.  The last bit of useful information I
 found was from July 2004, so the situation might have changed since then
 and I figured I'd ask.
 
 What sort of problems can I expect to see?  Aesthetic problems, like
 negative numbers in df, are not a worry.  The vast majority of files
 will be 1GB or smaller, so that's not a concern either.  But the guy who
 did those tests in July got no space left on device after using up
 only 800GB or so, and that obviously would be a problem.  Naturally I
 can, and will, test this myself when I get the hardware, but I'm
 concerned that there may be creeping invisible problems which might
 result in frequent panics or loss of data - problems which might not
 become apparent until after I've reached the point where I no longer
 have enough room to play musical chairs with my data (which will be
 about 400GB in).
 
 Any information anyone has, even if it's just a pointer to who or where
 I should be asking instead, will be greatly appreciated.  Thanks.
 
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