RMinNJ Posted May 6, 2005 Report Share Posted May 6, 2005 I am reposting this from the Device forum...sorry. I just installed Retrospect 7 on XP Home. I also added the latest drivers updates file. I did not install the updated retrospect 7 installer off the website. I'm using NT passthrough for either device (below). Tapes erase and label ok. Told it to use hardware compression (default for the tape devices). I have an old Adaptec 2940 PCI card (50 pin miniD connector) for a scsi card. It installed ok in XP and is listed in device manager. I installed seperately: a.)An Old Exabyte 8505 XL (14GB compressed on a tape) by itself on the bus. and then afterwards by itself b.) An old 4mm DAT drive 8GB compressed as far as I can tell. Comes up as a Python?? Disabled the device in device manager. I have about 5.8Gb to backup...My C: drive..OS, MS Apps, some games, pics. The 8mm drive wrote 2.3 Gb to a tape and asked for another; as if it was a low density 8mm. The 4mm DAT drive wrote 3.8Gb to a tape and deemed it full; as if it was a low density 4mm or I got no compression. I only mention the compression capacity as information if its related. The real problem was both these drives wrote at 23MB/min tops.. That's about 250Kb/sec. I think each drive is capable of 1MB/sec (60MB/min) max. At this rate the backup took all night and was not done in the morning because it prompted for another tape. I'm getting a DLT4000 drive to get the speed up but am concerned that something is wrong and I'm going to get the same speed (23MB/min) from that. I recall the 4mm backing up my W98 box with Backup Exec Express (2 gb) in a couple of hours. I'm wondering if I have something set wrong or this is as fast as Retrospect can operate these older tape drives? Would the PCI card sharing an interrupt do this? Anyone backing up XP to an older scsi tape drive care to post their MB/min? Thanks for any info. Link to comment Share on other sites More sharing options...
RMinNJ Posted May 11, 2005 Author Report Share Posted May 11, 2005 I'm replying to my own post for the forum. The lack of replies implies that not many are using 4mm or 8mm drives. That is actually good..I could not recommend them. This despite having lots of 8mm and 4mm tapes. I picked up a Compaq DLT4000 cheap. I downloaded the StorageWorks software for it and upgraded its firmware. I used a DLT IV I disabled the driver in Device Manager and ran a Retrospect backup. It erased the tape fine; the lights on the drive indicate 20GB+compression (the most a DLT4000 can do). NT passthru is the connection type. Performance was 77 MB/min to 230MB/min with an average of 115MB/min. Native speed for the drive is 1.5MB/sec . It would seem Retrospect is within the specs of the drive then. Anything is better the 20MB/min I got on the 4mm and 8mm. I'm off to make a DR CD now.. At is stands I recommend a DLT drive for anyone looking for a cheap backup device. Link to comment Share on other sites More sharing options...
philx509 Posted May 11, 2005 Report Share Posted May 11, 2005 Quote: I'm replying to my own post for the forum. The lack of replies implies that not many are using 4mm or 8mm drives. That is actually good..I could not recommend them. This despite having lots of 8mm and 4mm tapes. I picked up a Compaq DLT4000 cheap. I downloaded the StorageWorks software for it and upgraded its firmware. I used a DLT IV Performance was 77 MB/min to 230MB/min with an average of 115MB/min. Native speed for the drive is 1.5MB/sec . It would seem Retrospect is within the specs of the drive then. Anything is better the 20MB/min I got on the 4mm and 8mm. I'm off to make a DR CD now.. At is stands I recommend a DLT drive for anyone looking for a cheap backup device. How much for the DLT IV? Where? Ebay? How much for tapes? I'm using an Exabyte 8720 drive 7/14 GB, and about 60+MB/minute. Faster is better of course, and that is why I'm asking this question. Link to comment Share on other sites More sharing options...
RMinNJ Posted May 12, 2005 Author Report Share Posted May 12, 2005 Yes...ebay. $12 This was without an power supply enclosure but I had one of those. Came with a free DLT tape in it (luckily wasn't stuck). Prices start at $1 . That your getting 60 on your 8720 is amazing to me. I thought my 8505XL would do that but it did not even come close. That and the density seemed to be incorrect. A DLT4000 is the minimum needed to use DLTIV tapes.. tapes are available on ebay.. I see them online new for ~$20+ each. Link to comment Share on other sites More sharing options...
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