Questions tagged [scsi]
The scsi tag has no usage guidance.
107
questions
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127 views
FAILED Result: hostbyte=DID_SOFT_ERROR driverbyte=DRIVER_OK
What does it mean DID_SOFT_ERROR?
According to kernel source, it defined:
#define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
https://github.com/torvalds/linux/blob/...
0
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0answers
5 views
Detect/hook SCSI reset event
How can I set up a command to be triggered on an SCSI reset of a specific device (e.g. to power cycle a drive that usually can't recover with a reset).
I could leave a thread to parse dmesg and ...
0
votes
0answers
81 views
virsh attach-disk only work with name vd* instead of sd*
I have an qcow2 image and want to attach another disk to it.
# create new qcow2 disk
qemu-img create -f qcow2 vm-disk2 500G
Then I attach it as sdb:
virsh attach-disk myvm /var/lib/libvirt/images/...
0
votes
0answers
18 views
How to change number of logical blocks on a drive using sg utils?
I would like to change the number of logical blocks on a drive and the block size by modifying the write buffer.
The output of read capacity on that drive shows me number of logical blocks as ...
0
votes
0answers
25 views
Booting a Solaris VM from Hyper-V
Italy
I have some legacy software capable of running on Solaris. It booted in a PC from SCSI disks (BIOS MBR+Legacy GRUB). The operating system is in a partition of type BF00 (Solaris root).
Time ago,...
0
votes
1answer
30 views
scsi_host interconnects
Can you please explain storage interconnects with respect to Linux. What are exactly scsi_host0, host1, host2, etc. I recently checked on a VM that had around 39 hosts present in /sys/class/scsi_hosts/...
2
votes
0answers
27 views
How does a block device driver handle IO errors
When a block device gets a request to read a range of sectors, and one of those sectors has a read failure, how does the driver signal to the kernel that a partial read is available, and that the ...
2
votes
1answer
311 views
sd 5:0:0:0: [sda] Attached SCSI disk, what are these four numbers? Will they change?
I can usually see this log in dmesg:
sd 5:0:0:0: [sda] Attached SCSI disk
Can you please explain what are these 4 numbers?
Will these numbers change after reboot? or it should be constant?
1
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0answers
41 views
How to identify the disks of a Linux virtual machine in VMware vSphere 6
I have a virtualized RHEL7 server with vsphere 6, I need to remove some virtual disks from vCenter that are presented to my virtual machine (rhel server) that are no longer being used by the operating ...
3
votes
3answers
254 views
SCSI: SAN or local disk?
I have a Debian 9 running.
It has a SSD connected as well as a fibrechannel link to a SAN storage.
As far I see both are visible as /dev/sdX devices.
How can I find out what is the disk and what is ...
1
vote
0answers
39 views
how to make sure SCSI is properly freed
I have external SSD that I want to safely remove (as part of automation):
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 89.3M 1 loop /snap/core/...
0
votes
1answer
54 views
How to get host “client” initiator wwn's from FC SAN card & switch
I saw an IBM San Storage and at Host alias creation page they can show you available host (client) initiators wwn's to choose.
And I wonder how they can find client initiator wwn's from storage?
I ...
2
votes
0answers
402 views
USB SCSI drive recognized, but can't mount
This is a MyBook AV drive that was recording video from my fios box before I cut the cord. I'm trying to use it as a backup drive with a SCSI to USB cable. Ubuntu 18.04. Detected by lsusb and lsscsi, ...
1
vote
1answer
101 views
Can I change LIO SCSI Disk Vendor name
I'm using LIO for SAN scsi.
The shared disks shown as LIO-ORG at client side.
Example;
[root@testing ~]# lsblk -S
NAME HCTL TYPE VENDOR MODEL REV TRAN
sdc 4:0:0:0 disk LIO-...
2
votes
0answers
30 views
Does Linux has a fundamental limitation about using multiple cd/dvd drives simultaneously?
I have two cd/dvd drives in my laptop. One is an external USB drive and the other is the SATA drive that came with it.
And I can't burn two DVDs at the same time in both of them at full speed no ...
0
votes
1answer
185 views
connected old scsi disk via IDE->USB adapter, recognized in syslog but not fdisk?
I have an old hard disk I'm trying to check for data and format before recycling/donating. I'm using an IDE to USB adapter to connect the disk to my linux laptop. In my syslog I see the following ...
1
vote
1answer
80 views
How to terminate old IBM internal DDS-3 tape drive?
I'm having some difficulty getting an old DDS-3 tape reader working on my Linux workstation. Some details:
From the product code that is printed on the label (E30364) I managed to identify the tape ...
2
votes
0answers
288 views
/sys/block/sd*/device/timeout not accurate
The default value for the timeout file for SCSI disks is 30, supposedly meaning 30s. In my dmesg logs, I find that the system is waiting 180s before timing out. Setting timeout to various values ...
0
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0answers
164 views
Shrink LVM2 Thin Volume
I would like to shrink the space required by a thin volume used as a disk for a virtual machine (Windows). Unfortunately, the underlying disk is a USB-attached SSD and therefore mounting the NTFS ...
2
votes
2answers
1k views
What does Fedora Workstation 29 use as the default I/O scheduler?
If it depends on the exact type of block device, then what is the default I/O scheduler for each type of device?
Background information
Fedora 29 includes a Linux kernel from the 4.19 series. (...
0
votes
1answer
2k views
Dealing with Device-Mapper (Multipath) Failing paths
When a disk starts to die slowly multipath starts to Failing & Reinstating paths and this keeps forever.. (I'm using LSI-3008HBA card with SAS-JBOD not FC-Network)
Dmesg;
Sep 13 11:20:17 DEV2 ...
0
votes
1answer
81 views
How soon will linux notice that a disk has been detached ? And can it be quicker?
I found that if I detach a disk from my Linux server (CentOS 7), the related /dev/sd* file will disappear automatically about 10 seconds later.
I'm wondering how does Linux know a disk has been ...
1
vote
0answers
39 views
Drive emulation at driver level
I would like to emulate a virtual SED at driver level. The goal is to develop/simulate the "firmware" of a drive, and map driver interface commands to an app which would handle interface specific ...
3
votes
1answer
4k views
how to tell which disk is sda and which is sdb disk?
from the df -k command, I see sda, sdb, sdc disks. They have some partitions (for example, sda has sda1, sda3). I want to detach sdb and sdc temporarily for OS upgrade. How exactly can I tell which ...
0
votes
1answer
386 views
Why is `ioerr_cnt` rising, without showing any messages in the log?
$ cd /sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0
$ ls -l driver subsystem
lrwxrwxrwx. 1 root root 0 Apr 5 10:48 driver -> ../../../../../../../bus/scsi/drivers/sd
...
0
votes
0answers
35 views
How to view pending SCSI requests?
If the PC sends a request to read a sector on an optical disc, which turns out to be unreadable, the drive deadlocks the program into responselessness and motionlessness, until it returns the sector ...
2
votes
1answer
145 views
SCSI LTO4 very slow on CentOS 7
I've replaced my backup server and I switched from a Debian Stretch to a CentOS7. I have a SuperLoader 3 LTO4 SCSI on an old adaptec SCSI 160. At first, I had to use the CentOSplus kernel which add ...
1
vote
1answer
364 views
How to format floppy disks in a USB floppy disk drive on FreeBSD?
I want to format a MF 2HD floppy in a USB floppy disk drive. Since a USB floppy disk drive appears as a da(4) device instead of an fdc(4) device, the standard fdformat utility cannot be used. How ...
4
votes
1answer
1k views
dmesg Output - Mode Sense - Bytes Explanation
Run dmesg and grep on [sda] Mode Sense: to return a row such as this:
[sda] Mode Sense: 00 3a 00 00
What do the 4 bytes of data represent 00 3a 00 00?
Its likely the answer is contained in a ...
0
votes
1answer
209 views
mtx reverses the numbers given to tape drives by CentOS and scsi generic (sg) devices
we have some confusion when we run mtx commands to load a tape from an autoloader slot to tape drive. we have two LTO-5 tape drives connected to our backup server. They are recognized by the ...
1
vote
0answers
208 views
Max transfer size in SG_IO/SG_ATA_16
I need to pass a direct, raw ATA request to a hard drive (0x25, READ DMA EXT), to disobey max sector count (long story), and to bypass all possible OS caches, buffers, reorderings et al.
...
7
votes
2answers
31k views
How to detect new hard disk attached without rebooting?
I'm having a little issue. I've a live system which run on RHEL 6.7 (VM) and have VMware 6.5 (which is not managed by our group) . The issue is, the other group tried to extend the capacity of an ...
1
vote
1answer
407 views
(re)Scanning scsi device works while scanning scsi host doesn't on centOS 6.9
Today I added 1GB of extra space to a virtual disk (basically extended it) in esxi VM. I followed 2 approaches to get the new space recognized:
echo "- - -" > /sys/class/scsi_host/host2/scan
...
1
vote
1answer
1k views
How to interpret SCSI device (sd) timeout logs
In /var/log/messages, I find the following log:
Oct 23 21:48:53 localhost kernel: sd 3:0:0:0: timing out command, waited 180s
Please explain the values that are separated by colons.
Also where ...
3
votes
1answer
472 views
My LTO tape drive is slow and “shoe-shines” on FreeBSD
Regardless of what data I write to my LTO-4 tape drive /dev/nsa0, writing is very slow (less than 1 MB/s) and the tape is constantly being wound back and forth in a shoe-shine pattern. No speed ...
0
votes
1answer
420 views
Get SAN Lun Names
My storage administrator assigned LUNS for a RHEL 5.10 Server.
Now when I run /sbin/scsi_id -g -u -s /block/sdN, it shows:
360060160c8803500183327ae00a2e711
Now I want to see the exact name, just ...
0
votes
2answers
8k views
How to figure out SCSI_ID on RHEL7
I am running into an issue on a server I am building into a template for Oracle on Red Hat 7. I can't seem to pull in my SCSI IDs of hard drives. Here is what I have tried so far.
[root@...
2
votes
2answers
280 views
How can I read and extract information from a DDS-1 tape today?
I have a DDS-1 tape (Sony 60M 1.3 GB tape) and am hoping to find a tape drive where I can still read it. The problem is that while I can find the associated compatible tape drives online, I am not ...
0
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0answers
347 views
Usb storage doesn't mount
I'm connecting my LinkitOne to my arch linux pc, and it doesn't mount.
When I'm connecting same Linkit One to windows pc and another arch linux pc it works as it should.
Here is dmesg output on my pc ...
2
votes
0answers
2k views
How do I determine the cause of a SCSI device reset?
I found this in /var/log/messages:
Jul 27 03:59:46 localhost kernel: sd 3:0:1:0: [sdd] SCSI device reset on scsi3:1
I don't see any other error logs to indicate why the reset occurred.
How do I ...
1
vote
1answer
384 views
/proc/scsi/<device> not found, but device is otherwise working
I have a RocketRaid 622 RAID controller card, installed on a machine running Linux Mint 18.2. The drivers have been successfully compiled and installed with dkms, after some customizations to make it ...
2
votes
0answers
48 views
Multipath — Ignoring internal disks
I want to configure multipath such that it ignores all the internal disks and only sees SAN Luns. Any idea how can I achieve that?
Basically I want to filter out all the internal disks like IDE, SAS ...
1
vote
1answer
1k views
monitor iops sizes
How to monitor size of the storage iops on a modern Linux ?
I'm able to monitor quantity of the storage iops using commands like iostat. However I would like to know the size of the iops which are ...
4
votes
2answers
1k views
How to find out what enclosure a disk belongs to?
lsscsi tells me that I have a number of disks and enclosures.
I can use $ ls /sys/class/enclosure/6:0:10:0/ArrayDevice*/device/scsi/disk to get a listing of all the scsi addresses of disks under the ...
7
votes
1answer
3k views
“Cannot allocate memory” when reading from SCSI tape
I am experimenting with some old SCSI tape drives, and I have successfully written some data to a tape, but I am struggling trying to read it back again.
# tar tvf /dev/st0
tar: /dev/st0: Cannot ...
1
vote
0answers
1k views
Disable disk spindown with sdparm?
I'm using USB drive sat controller so hdparm doesn't fully work for me. How can I disable spindown with sdparm? (equivalent of -B 255, -S 0)
lapsio@nuc ~> sudo hdparm -I /dev/sdb
/dev/sdb:
ATA ...
1
vote
1answer
580 views
Force disk onto /dev/sdX
I'm trying to ddrescue (through rescueCD) a drive, which keeps spinning down. e.g
ddrescue -N -n -A -M -f /dev/sdk /dev/sdd mapfile
Without rebooting I can get the drive for a short while through
...
4
votes
2answers
812 views
How to get Linux to completely ignore a SCSI drive?
Similar to this question I a am interested in completely ignoring a drive, but in my case it is one drive which is exposed to the system as a SCSI drive. I have two drives from 21 drives in the server ...
1
vote
2answers
120 views
How is reliability achieved with SCSI and SAN?
I am pretty new to SCSI and actually not even sure if this is the correct forum to ask. (I did because I found some SCSI questions :) So please feel free to improve/migrate this question.
I am ...
0
votes
1answer
279 views
How to change the ID number of the SCSI bus
I've 2 disk in RAID1 which is broken. I worked several day thinking the RAID is working and I noted not because several files is missing after a reboot.
The odder the disk doesn't want to take its ...
