On 13/10/14, 21:16, Peter wrote:
On 10/14/2014 02:15 PM, Joakim Ziegler wrote:
I have a rather large box (2x8-core Xeon, 96GB RAM) where I have a
couple of disk arrays connected on an Areca controller. I just added a
new external array, 8 3TB drives in RAID5, and the testing I'm doing
right now is on this array, but this seems to be a problem on this
machine in general, on all file systems (even, possibly, NFS, but I'm
not sure about that one yet).
The first thing I would check is that you have a BBU installed on the
areca controller and that it is functioning properly (check the cli, I
don't know the exact commands off the top of my head), also make sure
that write caching is enabled on the controller (after you've checked
the BBU, of course). Without a working BBU in place hardware RAID
controllers, such as areca, disable write caching (by default) and this
will have a significant impact on write speeds.
Note that newer controllers use a type of flash memory instead of a BBU.
Yes, I have a BBU and it's working. No write caching should, however, not affect
raw device writes and filesystem writes so differently, I think.
--
Joakim Ziegler - Supervisor de postproducción - Terminal
joakim@xxxxxxxxxxxxxx - 044 55 2971 8514 - 5264 0864
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