Quoting Andrew Greig (pushin.linux@gmail.com):
I have a SCSI scanner Epson GT7000, which I love, but occasionally in the past I may have turned it off, and as a consequence it is not detected at boot. In the old days when boot times were quick I would turn it on and reboot, but boot up time is not trivial in my Ubuntu system and so I am inquiring is there a way for the system to discover that the scanner is now turned on. Is there a way for the device to say "hey, I'm here now, let's play". Or for the system to say, "well you weren't here at the start, but we'll let you play"
As the root user, try: echo 1 > /sys/class/scsi_device/device/rescan (Variations on that are covered at https://thornelabs.net/2012/08/22/linux-rescan-scsi-bus.html, which please also see.[1]) There is also a related script rescan-scsi-bus.sh traditionally said to be furnished by something called sg3_utils, which I have not seen.) (Disclaimer #1: The first tip worked long ages ago, but I've not tested it in a long time.) (Disclaimer #2: I am in a very different time zone where I am up a bit past my bed time, ergo not ideally situated to fact-check before trying to help. Sorry, good sir.) [1] Web-search on 'scsi rescan linux' if not yet getting anywhere. Could work. -- Cheers, "He who laughs last, lasts." Rick Moen -- Leo Rosten rick@linuxmafia.com McQ! (4x80)
Andrew Greig via luv-main wrote:
Hi all,
I have a SCSI scanner Epson GT7000, which I love, but occasionally in the past I may have turned it off, and as a consequence it is not detected at boot
What hardware are you using ? Adaptec from memory used to show stuff connected on the SCSI bus during boot (Ctrl-A perhaps); or is " not detected at boot" just inferred ? regards Rohan McLeod
On Friday, 11 January 2019 7:22:35 PM AEDT Andrew Greig via luv-main wrote:
In the old days when boot times were quick
When things work correctly with systemd boot seems quicker than it has been for a long time, especially with SSD. Most of the Linux workstations I run have boot times comparable to MS-DOS. If things go wrong with systemd then things can get very slow (90 second timeouts). But that's a solvable problem. You should be able to rescan the SCSI bus. It's been a while since I used SCSI, but that functionality seemed to work well last time I tried it. Good SSDs have been just over $100 for a few years now. It used to be that 120G SSDs were about $120 each, now 512G is getting cheap. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/
On Saturday, 12 January 2019 12:19:26 AM AEDT Andrew Greig via luv-main wrote:
I should look at an SSD for my system drive I have a couple of new drives for my RAID.
SSDs are considerably smaller than hard drives. So a PC that only has space for 2 hard drives could probably fit 2 hard drives and 2 SSDs. SSDs also dissipate much less heat so can be crammed into spaces that don't have enough ventilation for hard drives. 2*SSD + 2*HDD makes for a nice system, lots of space on the HDD and good speed on the SSD. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/
presuming you've all already seem it, but next time I'm in the market for a laptop I'll be looking at system76. (because some of those laptops have quite a lot of SSD/HDD capacity...) https://system76.com/ also, while we are at it, if you need a system targetted or a specific task, have a look at puget systems page... https://www.pugetsystems.com/ On Sat, 12 Jan 2019 at 17:53, Russell Coker via luv-main < luv-main@luv.asn.au> wrote:
On Saturday, 12 January 2019 12:19:26 AM AEDT Andrew Greig via luv-main wrote:
I should look at an SSD for my system drive I have a couple of new drives for my RAID.
SSDs are considerably smaller than hard drives. So a PC that only has space for 2 hard drives could probably fit 2 hard drives and 2 SSDs. SSDs also dissipate much less heat so can be crammed into spaces that don't have enough ventilation for hard drives.
2*SSD + 2*HDD makes for a nice system, lots of space on the HDD and good speed on the SSD.
-- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/
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participants (5)
-
Andrew Greig -
Paul van den Bergen -
Rick Moen -
Rohan McLeod -
Russell Coker