mbl900@anusf (Mathew BM LIM) (05/21/91)
Hi, We are thinking of getting an exabyte stacker for a Sun 4/330 to act as a backup server. - Has anyone had any experience with using a stacker? - In general, is software to change tapes, etc. bundled with the stacker? - How reliable are they? - What is their transfer rate (eg how long would it take to back up a 1GByte filesystem)? - Any experience with the newer 5GByte exabytes as opposed to the 2GByte systems? Second question, does the SysVR4 "backup" system allow backing up onto remote devices (eg : an Exabyte stacker on a Sun4/330) and if so what is the mechanish, via RFS mounting the remote device or by some other mechanism? Thanks in advance. -- Mathew Lim, Unix Systems Programmer, ANU Supercomputer Facility, Australian National University, GPO Box 4, Canberra City, ACT, Australia 2601. Telephone : +61 6 249 2750 | ACSnet : Mathew.BM.Lim@anu.oz Fax : +61 6 247 3425 | Internet : Mathew.BM.Lim@anu.edu.au
abbott@ms.uky.edu (Joel Abbott) (05/21/91)
mbl900@anusf (Mathew BM LIM) writes: >Hi, > We are thinking of getting an exabyte stacker for a Sun 4/330 to >act as a backup server. ... >- How reliable are they? the exabytes themselves are pretty good. i've been using a few of them for about a year now. read/write errors are seldom, and the eccs seem to do the job. >- What is their transfer rate (eg how long would it take to back up a > 1GByte filesystem)? depends on what you are backing up, whether it is over the network, and the throughput of the network (is it noisy, etc). our network is pretty uncluttered at night when backups take place. i get about 10 (or a little more) megs/min over the network from a decent machine like a sparc. we also have some vaxen that won't die (i'd shoot them, but they have quite a few gigs of disk space that we can't throw away! :) and they transfer over the network at a snail pace of around 2 megs/minute on a good day. the sparcs do just about 15 megs/min locally. >- Any experience with the newer 5GByte exabytes as opposed to the 2GByte > systems? nope, but i sure wish i did! there is also a 25gig machine from exabyte as well. they claim up to 90meg/min transfer rate, but you will only get as high as your slowest component - your network and/or your disk. our exabytes are running on sparcs (sunos 4.1 and 4.1.1) and a decstation 2100 (mips based thingy running ultrix 4.0, we had problems getting pre ultrix 4.0, bad driver or something). each of the sparcs and the 2100 also have between 2-4 scsi drives daisy chained. we also have an 8mm running on a next machine. we haven't had much luck getting an exabyte running on an at&t 6386 running sysvr4.0. -- Joel Abbott, DoD#272 -> abbott@ms.uky.edu, abbott@ukma.bitnet, uunet!ukma!abbott