Date: Tue, 13 Mar 2001 19:10:21 +0100 (CET) From: =?ISO-8859-1?Q?G=E9rard_Roudier?= <groudier@club-internet.fr> To: Olivier Nicole <on@cs.ait.ac.th> Cc: gemorga2@vt.edu, mjacob@feral.com, freebsd-scsi@FreeBSD.ORG Subject: Re: SCSI speed with SLR100 tape drive Message-ID: <Pine.LNX.4.10.10103131857250.1881-100000@linux.local> In-Reply-To: <200103130203.JAA11318@banyan.cs.ait.ac.th>
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Olivier, I just dowloaded from Tandberg site the pdf document that contains the=20 technical specifications of the SLR100. (43203505.pdf). You can reach it by clicking 3 or 4 times appropriately.:) The SLR100 transfer rates are documented as follows: - 5 MB/s native sustained - 10 MB/s compressed sustained - 40 MB/s burst So, your tape device is actually operating at its maximum burst data rate, under FreeBSD. The Symbios BIOS device layout is what user wishes. What will be accepted by the device can be different. In our case, the driver is certainly negotiating for 40 MT/s wide =3D 80 MB/s, but the device lowers this speed in the response to 20 MT/s wide =3D 40 MB/s (wich is its maximum). Btw, if you donnot have the pdf document, let me know and I will send it you as attachment. Regards, G=E9rard. On Tue, 13 Mar 2001, Olivier Nicole wrote: > Gerard, >=20 > >Could you please, post _all_ the messages printed out by the sym driver? >=20 > I hope that's what you mean: >=20 > sym0: <896> port 0xb800-0xb8ff mem 0xfa000000-0xfa001fff,0xfa800000-0xfa8= 003ff i > rq 10 at device 5.0 on pci1 > sym0: Symbios NVRAM, ID 7, Fast-40, LVD, parity checking > sym0: open drain IRQ line driver, using on-chip SRAM > sym0: using LOAD/STORE-based firmware. > sym0: handling phase mismatch from SCRIPTS. > sym1: <896> port 0xb400-0xb4ff mem 0xf9000000-0xf9001fff,0xf9800000-0xf98= 003ff i > rq 11 at device 5.1 on pci1 > sym1: Symbios NVRAM, ID 7, Fast-40, LVD, parity checking > sym1: open drain IRQ line driver, using on-chip SRAM > sym1: using LOAD/STORE-based firmware. > sym1: handling phase mismatch from SCRIPTS. > [...] > Waiting 15 seconds for SCSI devices to settle > (noperiph:sym0:0:-1:-1): SCSI BUS reset delivered. > (noperiph:sym1:0:-1:-1): SCSI BUS reset delivered. > sa0 at sym1 bus 0 target 2 lun 0 > sa0: <TANDBERG SLR100 0402> Removable Sequential Access SCSI-2 device=20 > sa0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit) > da0 at sym0 bus 0 target 0 lun 0 > da0: <SEAGATE ST318436LW 0010> Fixed Direct Access SCSI-3 device=20 > da0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing = Enabled > da0: 17522MB (35885168 512 byte sectors: 255H 63S/T 2233C) > da4 at sym0 bus 0 target 4 lun 0 > da4: <SEAGATE ST318436LW 0010> Fixed Direct Access SCSI-3 device=20 > da4: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing = Enabled > da4: 17522MB (35885168 512 byte sectors: 255H 63S/T 2233C) > da3 at sym0 bus 0 target 3 lun 0 > da3: <SEAGATE ST318436LW 0010> Fixed Direct Access SCSI-3 device=20 > da3: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing = Enabled > da3: 17522MB (35885168 512 byte sectors: 255H 63S/T 2233C) > da2 at sym0 bus 0 target 2 lun 0 > da2: <SEAGATE ST318436LW 0010> Fixed Direct Access SCSI-3 device=20 > da2: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing = Enabled > da2: 17522MB (35885168 512 byte sectors: 255H 63S/T 2233C) > da1 at sym0 bus 0 target 1 lun 0 > da1: <SEAGATE ST318436LW 0010> Fixed Direct Access SCSI-3 device=20 > da1: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing = Enabled > da1: 17522MB (35885168 512 byte sectors: 255H 63S/T 2233C) >=20 > Disk are on SCSI bus 0, tape alone on bus 1. It looks pretty much it > is LVD. >=20 > When using the Symbios Configuration Utility it says: >=20 > SCSI=09 2 > Identification TANDGBERGSLR100 0402 > MB/sec=09 80 > MT/sec=09 40 > data width 16 > scan ID=09 yes > scan LUNs>0 yes > disconnect on > timeout=09 10 > queue tags on > boot choice no >=20 > Above information are similar for disk and bus controler, except the > SCSI target and the identification string. >=20 > >May-be 40 MB/s burst is already enough to feed the tape fast enough to > >allow it to stream data. >=20 > It is actually, just I am trying to understand. In fact I got the > drive but there is a shortage of media... The wonders of living in far > East :) >=20 >=20 > Merci, >=20 > Olivier To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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