Date: Sun, 18 Feb 1996 23:59:52 +0100 From: se@zpr.uni-koeln.de (Stefan Esser) To: Bob Willcox <bob@luke.pmr.com> Cc: freebsd-current@freefall.freebsd.org (freebsd-current) Subject: Re: Exabyte 8mm tape drive performance in -current? Message-ID: <199602182259.AA05589@Sysiphos> In-Reply-To: Bob Willcox <bob@luke.pmr.com> "Exabyte 8mm tape drive performance in -current?" (Feb 18, 15:55)
next in thread | previous in thread | raw e-mail | index | archive | help
On Feb 18, 15:55, Bob Willcox wrote: } Subject: Exabyte 8mm tape drive performance in -current? } I have observed that the (read and write) performance of my 8mm } Exabyte tape drives on my -current system runs roughly half of what } it is on my 2.1-stable systems (100kb/sec vs. 200kb/sec). This is } with both the NCR 810 and Adaptec 2940 adapters and using programs } such as dump, tar, dd, team. The systems that I have compared have } roughly the same hardware (both are 100MHz Pentiums). Performance } on my Wangtek QIC-525 tape drive is about the same. Can anybody } offer up an explaination of why this is and what might be done to } fix it? Did you compare the output of "mt status" ? The EXABYTE drives are known to become very slow if used with an unsuitable blocksize. Make sure you don't use 512 byte fixed size blocks with -current ... Regards, STefan -- Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021 Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160 ============================================================================== http://www.zpr.uni-koeln.de/~se <se@ZPR.Uni-Koeln.DE>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199602182259.AA05589>