Date: Wed, 4 Aug 2010 21:17:52 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: "Alex V. Petrov" <alexvpetrov@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: zpool - low speed write Message-ID: <20100805041752.GA89285@icarus.home.lan> In-Reply-To: <201008042008.25679.alexvpetrov@gmail.com> References: <201008042008.25679.alexvpetrov@gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, Aug 04, 2010 at 08:08:24PM +0800, Alex V. Petrov wrote: > ada2 at ahcich2 bus 0 scbus2 target 0 lun 0 > ada2: <WDC WD10EADS-00M2B0 01.00A01> ATA-8 SATA 2.x device > ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) > ada2: Command Queueing enabled > ada2: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C) > ada3 at ahcich3 bus 0 scbus3 target 0 lun 0 > ada3: <WDC WD10EADS-00L5B1 01.01A01> ATA-8 SATA 2.x device > ada3: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) > ada3: Command Queueing enabled > ada3: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C) > ada4 at ahcich4 bus 0 scbus4 target 0 lun 0 > ada4: <WDC WD10EADS-00M2B0 01.00A01> ATA-8 SATA 2.x device > ada4: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) > ada4: Command Queueing enabled Your ada3 disk is different from the other two. Can you please provide the output from the following 3 commands? camcontrol identify ada2 camcontrol identify ada3 camcontrol identify ada4 > vfs.zfs.cache_flush_disable=1 > vfs.zfs.zil_disable=1 I question both of these settings, especially the latter. Please remove them both and re-test your write performance. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100805041752.GA89285>