Hi,
I have a dual xeon 64GB 1U server with two free 3.5 drive slots. I also
have a free PCI-E slot.
I'm going to run a postgress database with a business intelligence
application.
The database size is not really set. It will be between 250-500GB
running on Solaris 10 or b134.
My storage
Given the abysmal performance, I have to assume there is a significant
number of overhead reads or writes in order to maintain the DDT for each
actual block write operation. Something I didn't mention in the other
email is that I also tracked iostat throughout the whole operation. It's
all
I have a dual xeon 64GB 1U server with two free 3.5 drive slots. I
also have a free PCI-E slot.
I'm going to run a postgress database with a business intelligence
application.
The database size is not really set. It will be between 250-500GB
running on Solaris 10 or b134.
Running
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org] On Behalf Of Edward Ned Harvey
When you read back duplicate data that was previously written with
dedup, then you get a lot more cache hits, and as a result, the reads go
faster. Unfortunately these
When it's not cached, of course the read time was equal to the
original
write time. When it's cached, it goes 4x faster. Perhaps this is only
because I'm testing on a machine that has super fast storage... 11
striped
SAS disks yielding 8Gbit/sec as compared to all-RAM which yielded
Oh - and as a final point - if you are planning to run Solaris on this
box, make sure they are not the 4KB sector disks, as at least in my
experience, their performance with ZFS is profoundly bad. Particularly
with all the metadata update stuff...
Hitachi deskstar uses 512byte sectors
From: Roy Sigurd Karlsbakk [mailto:r...@karlsbakk.net]
Sent: Saturday, July 09, 2011 2:33 PM
Could you test with some SSD SLOGs and see how well or bad the system
performs?
These are all async writes, so slog won't be used. Async writes that have a
single fflush() and fsync() at the end
From: Roy Sigurd Karlsbakk [mailto:r...@karlsbakk.net]
Sent: Saturday, July 09, 2011 2:33 PM
Could you test with some SSD SLOGs and see how well or bad the
system
performs?
These are all async writes, so slog won't be used. Async writes that
have a single fflush() and fsync() at
