Re: Benchmark: Dell/Perc 6, 8 disk RAID 10

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Scott Marlowe wrote:
On Fri, Mar 14, 2008 at 12:17 AM, Jesper Krogh <jesper@xxxxxxxx> wrote:
Scott Marlowe wrote:
 > On Thu, Mar 13, 2008 at 3:09 PM, justin <justin@xxxxxxxxxxxxxxx> wrote:
 >
 >>  I chose to use ext3 on these partition
 >
 > You should really consider another file system.  ext3 has two flaws
 > that mean I can't really use it properly.  A 2TB file system size
 > limit (at least on the servers I've tested) and it locks the whole
 > file system while deleting large files, which can take several seconds
 > and stop ANYTHING from happening during that time.  This means that
 > dropping or truncating large tables in the middle of the day could
 > halt your database for seconds at a time.  This one misfeature means
 > that ext2/3 are unsuitable for running under a database.

 I cannot acknowledge or deny the last one, but the first one is not
 true. I have several volumes in the 4TB+ range on ext3 performing nicely.

 I can test the "large file stuff", but how large? .. several GB is not a
 problem here.

Is this on a 64 bit or 32 bit machine?  We had the problem with a 32
bit linux box (not sure what flavor) just a few months ago.  I would
not create a filesystem on a partition of 2+TB

It is on a 64 bit machine.. but ext3 doesnt have anything specifik in it as far as I know.. I have mountet filesystems created on 32 bit on 64 bit and the other way around. The filesystems are around years old.

http://en.wikipedia.org/wiki/Ext3 => Limit seems to be 16TB currently (It might get down to something lower if you choose a small blocksize).

--
Jesper

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