Date: Fri, 31 Jan 2003 11:22:59 -0600 (CST) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: joe mcguckin <joe@via.net> Cc: hardware@FreeBSD.ORG Subject: Re: DLT tape not streaming Message-ID: <20030131111850.I4402@duey.wolves.k12.mo.us> In-Reply-To: <BA5EEC45.1F66F%joe@via.net> References: <BA5EEC45.1F66F%joe@via.net>
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On Thu, 30 Jan 2003, joe mcguckin wrote: > Our DLT-7000 tape drive does not stream continuously - there's quite > a bit of shuttling back and forth. > > Are there any SCSI parameters I can tweak to improve it's > performance? Assuming you can actually read the data off the disks and/or network fast enough, if you can't seem to feed the drive enough data across the SCSI bus to keep it streaming then you aren't using a large enough block size. If you're trying to feed the drive 512-byte blocks, that is likely not going to work. I would recommend somewhere between a 32KB and 128KB block size for a DLT drive. I use 64KB blocks with my DLT1 drive, but I think that is also the maximum block size in Windows NT, which is what the drive is attached to. I think FreeBSD supports up to 128KB blocks. -- Chris Dillon - cdillon(at)wolves.k12.mo.us FreeBSD: The fastest and most stable server OS on the planet - Available for IA32 (Intel x86) and Alpha architectures - IA64, PowerPC, UltraSPARC, ARM, and S/390 under development - http://www.freebsd.org No trees were harmed in the composition of this message, although some electrons were mildly inconvenienced. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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