Re: 3Ware 7500-4 Slow

2005-09-27 Thread Francisco Reyes
On Fri, 23 Sep 2005, Eric Anderson wrote: I bought the array here: http://www.acnc.com The biggest RAID-5 we have is on one of those boxes. So far has performed very well for us. ___ freebsd-performance@freebsd.org mailing list http://lists.freebsd

Re: 3Ware 7500-4 Slow

2005-09-27 Thread Francisco Reyes
On Thu, 22 Sep 2005, Chuck Swiger wrote: So-so. RAID-5 is okay on a IMAP reader box, it's not so good for a pure SMTP relay, especially one that does virus scanning. For our SMTP I think we will have "small" machines with RAID-1 If your DB claims to support a RAID-5 Will check. Will be us

Re: 3Ware 7500-4 Slow

2005-09-23 Thread Eric Anderson
Francisco wrote: On Mon, 5 Sep 2005, Chuck Swiger wrote: Small writes are pretty much the worst-case scenario for RAID-5, Such as mail servers? How about for a DB server which is mostly read only? normal to see a very significant performance drop-- by up to an order of magnitude-- from the

Re: 3Ware 7500-4 Slow

2005-09-23 Thread Francisco
On Mon, 5 Sep 2005, Chuck Swiger wrote: Small writes are pretty much the worst-case scenario for RAID-5, Such as mail servers? How about for a DB server which is mostly read only? normal to see a very significant performance drop-- by up to an order of magnitude-- from the performance of a b

Re: 3Ware 7500-4 Slow

2005-09-23 Thread Achim Patzner
Am 23.09.2005 um 05:05 schrieb Chuck Swiger: I have been trying to convince the "powers that be" that SCSI would be much better.. but the price difference is just too astronomical for the capacities we need (500GB to 2 TB) Even 10K RPM IDE drives seem like would be a problem since they are

Re: 3Ware 7500-4 Slow

2005-09-22 Thread Chuck Swiger
Francisco wrote: On Mon, 5 Sep 2005, Chuck Swiger wrote: Small writes are pretty much the worst-case scenario for RAID-5, Such as mail servers? So-so. RAID-5 is okay on a IMAP reader box, it's not so good for a pure SMTP relay, especially one that does virus scanning. How about for a DB

Re: 3Ware 7500-4 Slow

2005-09-05 Thread Chuck Swiger
Jeff Tchang wrote: [ ... ] When I attempt to write many small files or remove a directory is when the slowness kicks in. Is this just something due to Raid5? Here is the output of Bonnie++: Small writes are pretty much the worst-case scenario for RAID-5, and it's normal to see a very signific

Re: 3Ware 7500-4 Slow

2005-09-04 Thread Steven Hartland
From what I've seen with such a slow machine and only 3 disks I doubt you would get good performance. Steve - Original Message - From: "Jeff Tchang" <[EMAIL PROTECTED]> I have a 3Ware 7500-4 card. I am experiencing some sluggishness with the RAID5 implementation. It has been running

3Ware 7500-4 Slow

2005-09-04 Thread Jeff Tchang
I have a 3Ware 7500-4 card. I am experiencing some sluggishness with the RAID5 implementation. It has been running in a stable state for quite some time, however, I have always wondered if there was something I was not doing because it is very slow. System Specs: pharos# dmesg | grep twe twe0: