diff options
Diffstat (limited to 'Documentation/scsi/ibmmca.txt')
| -rw-r--r-- | Documentation/scsi/ibmmca.txt | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/Documentation/scsi/ibmmca.txt b/Documentation/scsi/ibmmca.txt index d16ce5b540f469..35f6b8ed229587 100644 --- a/Documentation/scsi/ibmmca.txt +++ b/Documentation/scsi/ibmmca.txt @@ -229,7 +229,7 @@ In a second step of the driver development, the following improvement has been applied: The first approach limited the number of devices to 7, far - fewer than the 15 that it could usem then it just maped ldn -> + fewer than the 15 that it could use, then it just mapped ldn -> (ldn/8,ldn%8) for pun,lun. We ended up with a real mishmash of puns and luns, but it all seemed to work. @@ -254,12 +254,12 @@ device to be existant, but it has no ldn assigned, it gets a ldn out of 7 to 14. The numbers are assigned in cyclic order. Therefore it takes 8 dynamical reassignments on the SCSI-devices, until a certain device - loses its ldn again. This assures, that dynamical remapping is avoided + loses its ldn again. This assures that dynamical remapping is avoided during intense I/O between up to 15 SCSI-devices (means pun,lun - combinations). A further advantage of this method is, that people who + combinations). A further advantage of this method is that people who build their kernel without probing on all luns will get what they expect, because the driver just won't assign everything with lun>0 when - multpile lun probing is inactive. + multiple lun probing is inactive. 2.4 SCSI-Device Order --------------------- @@ -309,9 +309,9 @@ 2.6 Abort & Reset Commands -------------------------- These are implemented with busy waiting for interrupt to arrive. - ibmmca_reset() and ibmmca_abort() do not work sufficently well - up to now and need still a lot of development work. But, this seems - to be even a problem with other SCSI-low level drivers, too. However, + ibmmca_reset() and ibmmca_abort() do not work sufficiently well + up to now and need still a lot of development work. This seems + to be a problem with other low-level SCSI drivers too, however this should be no excuse. 2.7 Disk Geometry @@ -684,8 +684,8 @@ not like sending commands to non-existing SCSI-devices and will react with a command error as a sign of protest. While this error is not present on IBM SCSI Adapter w/cache, it appears on IBM Integrated SCSI - Adapters. Therefore, I implemented a workarround to forgive those - adapters their protests, but it is marked up in the statisctis, so + Adapters. Therefore, I implemented a workaround to forgive those + adapters their protests, but it is marked up in the statistics, so after a successful boot, you can see in /proc/scsi/ibmmca/<host_number> how often the command errors have been forgiven to the SCSI-subsystem. If the number is bigger than 0, you have a SCSI subsystem of older @@ -778,15 +778,15 @@ not accept this, as they stick quite near to ANSI-SCSI and report a COMMAND_ERROR message which causes the driver to panic. The main problem was located around the INQUIRY command. Now, for all the - mentioned commands, the buffersize, sent to the adapter is at + mentioned commands, the buffersize sent to the adapter is at maximum 255 which seems to be a quite reasonable solution. - TEST_UNIT_READY gets a buffersize of 0 to make sure, that no + TEST_UNIT_READY gets a buffersize of 0 to make sure that no data is transferred in order to avoid any possible command failure. - 2) On unsuccessful TEST_UNIT_READY, the midlevel-driver has to send - a REQUEST_SENSE in order to see, where the problem is located. This + 2) On unsuccessful TEST_UNIT_READY, the mid-level driver has to send + a REQUEST_SENSE in order to see where the problem is located. This REQUEST_SENSE may have various length in its answer-buffer. IBM - SCSI-subsystems report a command failure, if the returned buffersize - is different from the sent buffersize, but this can be supressed by + SCSI-subsystems report a command failure if the returned buffersize + is different from the sent buffersize, but this can be suppressed by a special bit, which is now done and problems seem to be solved. 2) Code adaption to all kernel-releases. Now, the 3.2 code compiles on 2.0.x, 2.1.x, 2.2.x and 2.3.x kernel releases without any code-changes. @@ -1086,7 +1086,7 @@ Q: "Reset SCSI-devices at boottime" halts the system at boottime, why? A: This is only tested with the IBM SCSI Adapter w/cache. It is not - yet prooved to run on other adapters, however you may be lucky. + yet proven to run on other adapters, however you may be lucky. In version 3.1d this has been hugely improved and should work better, now. Normally you really won't need to activate this flag in the kernel configuration, as all post 1989 SCSI-devices should accept @@ -1104,7 +1104,7 @@ The parameter 'normal' sets the new industry standard, starting from pun 0, scanning up to pun 6. This allows you to change your opinion still after having already compiled the kernel. - Q: Why I cannot find the IBM MCA SCSI support in the config menue? + Q: Why can't I find IBM MCA SCSI support in the config menu? A: You have to activate MCA bus support, first. Q: Where can I find the latest info about this driver? A: See the file MAINTAINERS for the current WWW-address, which offers @@ -1156,7 +1156,7 @@ Guide) what has to be done for reset, we still share the bad shape of the reset functions with all other low level SCSI-drivers. Astonishingly, reset works in most cases quite ok, but the harddisks - won't run in synchonous mode anymore after a reset, until you reboot. + won't run in synchronous mode anymore after a reset, until you reboot. Q: Why does my XXX w/Cache adapter not use read-prefetch? A: Ok, that is not completely possible. If a cache is present, the adapter tries to use it internally. Explicitly, one can use the cache |