Opened 2 years ago
Closed 2 years ago
#1594 closed enhancement (fixed)
Enhance LBA range for jmb39x and jms56x device types
Reported by: | Alois | Owned by: | Christian Franke |
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Priority: | minor | Milestone: | Release 7.4 |
Component: | all | Version: | 7.3 |
Keywords: | jmicron jmb39x jms56x | Cc: |
Description
Hello,
I recently bought jmicron controllers to put away some duplication load (for mdraid level 1) from the system to those controllers.
I have one jmb56x and two jmb39x attached, smart readings work well besides one thing which makes me stomachache: I need to force on one of them for a sector as its boot record is stored there.
with "hdparm --read-sector" I searched for a free one on this device and could not find one in the range of 33 <= LBA <= 62
Is there a specific reason why it is limited to this range? My partiton tables start at 2048, so there would be much sectors before which are free (and zero-filled).
I tried with jmraidcon implementation, as I do not know how to e.g. mask 2047 in the command {READ_CMD, 0x00, 0x00, 0x00, 0x00, 0x21, 0x00, 0x00, 0x01, 0x00};
I just swapped 0x21 with 0xfe - LBA sector 254 which is also zero-filled on this device and it succeeds as well with this, so I assume the limited range is not caused by the JMicron controller not accepting the commands there?
I read all sectors until 2048 and from sector 105 starting they are all zero-filled (attached the txt of the affected drive). I would prefer to avoid always overwriting and restoring parts of my bootrecord, but as I am not sure why the limit is currently implemented this way, I would like to clarify this first. :-)
Thank you so much!
Best regards
Alois
Attachments (1)
Change History (5)
by , 2 years ago
Attachment: | sectors.zip added |
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comment:1 by , 2 years ago
Keywords: | jmicron jmb39x jms56x added |
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Milestone: | → undecided |
Summary: | question regarding LBA restrictions in dev_jmb39x_raid.cpp → Enhance LBA range for jmb39x and jms56x device types |
Type: | task → enhancement |
Version: | → 7.3 |
comment:2 by , 2 years ago
Hello Christian,
thanks - the patch works flawless and helps, I can use now a free sector :-)
compiled and tested on debian bullseye x64:
smartctl pre-7.4 2022-04-24 r5362 [x86_64-linux-5.10.0-13-amd64] (local build)
with controller type jms56x and jmb39x
and various sectors between 1 and 255
thank you!
Best regards
Alois
comment:3 by , 2 years ago
Milestone: | undecided → Release 7.4 |
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Owner: | set to |
Status: | new → accepted |
Thanks for quick testing. Patch will be applied soon.
The current code is limited to 8-bit LBA, so we could enhance the LBA range to 1-255 if this would help.
Please test this patch if possible:
dev_jmb39x_raid.cpp
33 <= lba && lba <= 62)) {33 <= LBA <= 62]", prefix);