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a34ec0f7ff
- Docs about limitation of having initiator and target on the same host updated + cleanups - Minor local thread storage improvements - TRACE_MGMT_MINOR excluded from the default set of trace flags to not confuse people - Dedicated kmem_cache for blockio created git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@662 d57e44dd-8a1f-0410-8b47-8ef2f437770f
101 lines
3.7 KiB
Plaintext
101 lines
3.7 KiB
Plaintext
SCST Debug ...
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Richard Sharpe, 30-Nov-2008
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This is the SCST Local driver. Its function is to allow you to access devices
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that are exported via SCST directly on the same Linux system that they are
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exported from.
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No assumptions are made in the code about the device types on the target, so
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any device handlers that you load in SCST should be visible, including tapes
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and so forth.
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You can freely use any sg, sd, st, etc. devices imported from target,
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except the following: you can't mount file systems or put swap on them.
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This is a limitation of Linux memory/cache manager. See SCST README file
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for details.
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To build, simply issue 'make' in the scst-local directory.
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Try 'modinfo scst_local' for a listing of module parameters so far.
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NOTE! This is now part of scst and supports being built in the scst tree.
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Here is how I have used it so far:
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1. Load up scst:
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modprobe scst
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modprobe scst_vdisk
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2. Create a virtual disk (or your own device handler):
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dd if=/dev/zero of=/some/path/vdisk1.img bs=16384 count=1000000
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# dd if=/dev/zero of=/some/path/vdisk2.img bs=16384 count=1000000
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echo "open vm_disk1 /some/path/vdisk1.img" > /proc/scsi_tgt/vdisk/vdisk
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# echo "open vm_disk2 /some/path/vdisk2.img" > /proc/scsi_tgt/vdisk/vdisk
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echo "add vm_disk1 0" > /proc/scsi_tgt/groups/Default/devices
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# echo "add vm_disk2 1" > /proc/scsi_tgt/groups/Default/devices
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3. Load the scst_local driver:
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insmod scst_local
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# insmod scst_local max_luns=8
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4. Check what you have
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cat /proc/scsi/scsi
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Attached devices:
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Host: scsi0 Channel: 00 Id: 00 Lun: 00
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Vendor: ATA Model: ST9320320AS Rev: 0303
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Type: Direct-Access ANSI SCSI revision: 05
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Host: scsi4 Channel: 00 Id: 00 Lun: 00
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Vendor: TSSTcorp Model: CD/DVDW TS-L632D Rev: TO04
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Type: CD-ROM ANSI SCSI revision: 05
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Host: scsi7 Channel: 00 Id: 00 Lun: 00
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Vendor: SCST_FIO Model: vm_disk1 Rev: 101
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Type: Direct-Access ANSI SCSI revision: 04
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5. Have fun.
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Some of this was coded while in Santa Clara, some in Bangalore, and some in
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Hyderabad. Noe doubt some will be coded on the way back to Santa Clara.
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The code still has bugs, so if you encounter any, email me the fixes at:
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realrichardsharpe@gmail.com
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I am thinking of renaming this to something more interesting.
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6. Change log
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V0.1 24-Sep-2008 (Hyderabad) Initial coding, pretty chatty and messy,
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but worked.
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V0.2 25-Sep-2008 (Hong Kong) Cleaned up the code a lot, reduced the log
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chatter, fixed a bug where multiple LUNs did not
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work. Also, added logging control. Tested with
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five virtual disks. They all came up as /dev/sdb
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through /dev/sdf and I could dd to them. Also
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fixed a bug preventing multiple adapters.
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V0.3 26-Sep-2008 (Santa Clara) Added back a copyright plus cleaned up some
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unused functions and structures.
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V0.4 5-Oct-2008 (Santa Clara) Changed name to scst_local as suggested, cleaned
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up some unused variables (made them used) and
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change allocation to a kmem_cache pool.
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V0.5 5-Oct-2008 (Santa Clara) Added mgmt commands to handle dev reset and
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aborts. Not sure if aborts works. Also corrected
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the version info and renamed readme to README.
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V0.6 7-Oct-2008 (Santa Clara) Removed some redundant code and made some
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changes suggested by Vladislav.
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V0.7 11-Oct-2008 (Santa Clara) Moved into the scst tree. Cleaned up some
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unused functions, used TRACE macros etc.
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V0.9 30-Nov-2008 (Mtn View) Cleaned up an additional problem with symbols not
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being defined in older version of the kernel. Also
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fixed some English and cleaned up this doc.
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