bonnetf@apo.esiee.fr (bonnet-franck) (03/09/90)
Hello , Could somebody explain to me,why the disks of ours dn570t became so SLOW !!!( the word is weak ...) till we get the 10.1. These machines have 8MB of memory and a 146 MB Maxtor disk. Should it be a controller or a disk problem ? I precise that we have 5 of these machines,and the 5 are SLOW alike . For example boot time is about 2 time longer than a poor DN3000 with 4MB of memory ( with a nice washing-machine noise ! ). We have no informations about the new organization of the disks in 10.xxx releases. Does somebody has ? --------------------------------------- bonnetf@apo.esiee.fr Frank Bonnet E.S.I.E.E BP99 93162 Noisy le Grand cedex.FRANCE. Fax : 16 145926699 ---------------------------------------
krowitz%richter@UMIX.CC.UMICH.EDU (David Krowitz) (03/09/90)
A lot of the earlier DN550 and DN560 nodes have ST501 disk controllers which are considerably slower than the EDSI controllers used in the DN3000 and DN4000. I believe Apollo switched to an EDSI controller for the DN570/580/590 with the 348 MB disks, but if you have the smaller disks the controller may be the same ST501 controller which is in our DN560. Not only is it slower than the DN3000, but the cartridge tape uses the same controller -- and I'm not talking about a multi-function controller that has both a tape and a disk controller, I'm talking about the *same* controller. When the tape is reading or writing a block, the disk can not be accessed and vice-versa. If you try reading a file while the tape is going, you'll find that there will be a flurry of disk I/O (with that nice washing machine sound) followed by the tape moving, but not both at the same time. -- David Krowitz krowitz@richter.mit.edu (18.83.0.109) krowitz%richter.mit.edu@eddie.mit.edu krowitz%richter.mit.edu@mitvma.bitnet (in order of decreasing preference)