Re: Performance issues with Areca 1680 SAS Controllers

[Pasi Kärkkäinen]

On Thu, Aug 20, 2009 at 09:54:27AM +0800, Nick Cheng wrote:
> Hi Gentlemen,
> We have worked it out with new firmware and driver.
> You can download the latest F/W from
> ftp://ftp.areca.com.tw/RaidCards/BIOS_Firmware/ARC1680/ and use the attached
> driver.
> Please have a try.
> Any comments are welcome.

Thanks! I'll give it a try today and report back.

-- Pasi

> Thank you,
> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> Sent: Wednesday, August 19, 2009 10:09 PM
> To: Nick Cheng
> Cc: 'Andrew Morton'; 'Michael Fuckner'; linux-kernel@xxxxxxxxxxxxxxx;
> linux-scsi@xxxxxxxxxxxxxxx; 'Erich Chen'
> Subject: Re: Performance issues with Areca 1680 SAS Controllers
> 
> On Thu, Nov 20, 2008 at 03:39:40PM +0800, Nick Cheng wrote:
> > Hi Michael,
> > I will get around handling your issue.
> > Thanks for your kindly patience,
> > 
> 
> Hello,
> 
> Was this issue resolved? I'm seeing similar behaviour.. I think it's related
> to flushing the controller cache?
> 
> Waiting a while (after the disk leds stop blinking) performance is back to
> normal.. 
> 
> -- Pasi
> 
> > -----Original Message-----
> > From: Andrew Morton [mailto:akpm@xxxxxxxxxxxxxxxxxxxx] 
> > Sent: Thursday, November 20, 2008 9:18 AM
> > To: Michael Fuckner
> > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx; Nick Cheng;
> > Erich Chen
> > Subject: Re: Performance issues with Areca 1680 SAS Controllers
> > 
> > (cc's added)
> > 
> > On Wed, 19 Nov 2008 13:16:56 +0100
> > Michael Fuckner <michael@xxxxxxxxxxx> wrote:
> > 
> > > Hi,
> > > 
> > > I am using an Areca 1680-SAS-Controller with 16 SAS-HDD (Seagate 1TB
> > > ST31000640SS). I set up a Raid6 with all 16 disks and formatted it with
> > > XFS. The Controller has 512MB RAM and a BBU. The OS is installed to
> > > another disk attached to the onboard AHCI controller.
> > > 
> > > After doing some IO, the areca raidset is slower compared to the rate 
> > > directly
> > > after boot.
> > > 
> > > 
> > > [root@storage ~]# dd if=/dev/sdb1 of=/dev/null bs=1M count=50k
> > iflag=direct
> > > 51200+0 records in
> > > 51200+0 records out
> > > 53687091200 bytes (54 GB) copied, 59.6494 seconds, 900 MB/s
> > > [root@storage ~]# mount /dev/sdb1 /data
> > > [root@storage ~]# cd /data/
> > > [root@storage data]# ./iozone -i 0 -i 1 -s 32g -r 16m -S 6144 -t 8 -+r
> > > -o  >raid6_sync_t8.log
> > > [root@storage data]# cd
> > > [root@storage ~]# umount /data/
> > > [root@storage ~]# dd if=/dev/sdb1 of=/dev/null bs=1M count=50k
> > iflag=direct
> > > 51200+0 records in
> > > 51200+0 records out
> > > 53687091200 bytes (54 GB) copied, 76.4036 seconds, 703 MB/s
> > > 
> > > I tested different Versions of Linux (Centos 5.2, OpenSUSE 11, Debian
> > > Lenny) and Vanilla kernels 2.6.22-2.6.27, all show this behaviour.
> > > 
> > > Idea why the device slows down after IO- or better: how to keep the high
> > > rate? Is this reproducible foer Areca SATA Controllers (Type 11XX and
> > 12XX)
> > > 
> > > Regards,
> > >    Michael!
> > 
> > --
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