Doron Shoham wrote:
Vu Pham wrote:
In order to run with *scst_disk* you need to patch and rebuild the
kernel. Please follow SCST readme to do this task
If you don't want to patch and rebuild the kernel, you can run with
*scst_vdisk* and get the same performance. I attach here an example to
setup *scst_vdisk*
-vu
Can you please explain me what is the differences between scst_disk and
scst_vdisk?
scst_disk: scsi pass through module driver, using scsi
mid-level interfaces to send commands
scst_vdisk: simulating file and block devices as scsi luns.
Using file system interfaces (fileIO) and block interfaces
(blockio) to send commands
Is there any way to config SCST to work with RAM device (instead of working
with a real
scsi device)?
Yes. There are two ways
1. NULLIO or memory IO
a. dd if=/dev/zero of=/tmp/tempfile bs=64k count=100
b. echo "open vdisk0 /tmp/tempfile NULLIO" >
/proc/scsi_tgt/vdisk/vdisk
c. echo "add vdisk0 0" > /proc/scsi_tgt/groups/Default/devices
2. Using ramdisk
a. echo "open vdisk1 /dev/ram0 BLOCKIO" >
/proc/scsi_tgt/vdisk/vdisk
b. echo "add vdisk1 1" > proc/scsi_tgt/groups/Default/devices
Lun 0 with NULLIO will perform better
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