Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!ucsd!ucbvax!unisoft!greywolf From: greywolf@unisoft.UUCP (The Grey Wolf) Newsgroups: comp.unix.questions Subject: Re: exabyte to exabyte copy -- How? Message-ID: <3483@unisoft.UUCP> Date: 13 Apr 91 23:13:40 GMT References: Reply-To: greywolf@unisoft.UUCP (The Grey Wolf) Distribution: comp.unix questions, comp.unix.admin, alt.sys.sun Organization: Foo Bar and Grill Lines: 30 /* by gplan@sun9.aer.com (George Planansky) * I need a way to make copies of our exabyte dump tapes, a couple of * times a week. These have ten or so dump files on them. * 2. Is there in fact a way to run exabyte drives to make copies directly: * * exabyte tape drive a ---> exabyte tape drive b * * 3. If there is a reasonable way to make duplicates of these exabyte * tapes, I would appreciate hearing of it. Have you considered something like: dd if=/dev/xbt0 of=/dev/xbt1 ibs=128k obs=128k I used to do that with *other* tapes :-) (insert standard exabyte-ignorant disclaimer). It ought to work pretty well, though, especially if the drive can read/write at a fairly good clip (in which case 128k may not be the top limit on performance). Question: Is the Exabyte SCSI-only, or has anyone made a decent DMA implementation (I am (possibly erroneously) under the impression that SCSI does not do DMA))? * * Thanks. * -- * George Planansky * Atmospheric & Environmental Research * 840 Memorial Drive, Cambridge, MA 02139 * gplanansky@aer.com (617) 547-6207 fax: 661-6479