Questions tagged [scsi]
Small Computer System Interface (SCSI) is a set of standards for physically connecting and transferring data between computers and peripheral devices.
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Disk full, du tells different. How to further investigate?
I have a SCSI disk in a server (hardware Raid 1), 32G, ext3 filesytem. df tells me that the disk is 100% full. If I delete 1G this is correctly shown.
However, if I run a du -h -x / then du tells me ...
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How do I make Linux recognize a new SATA /dev/sda drive I hot swapped in without rebooting?
Hot swapping out a failed SATA /dev/sda drive worked fine, but when I went to swap in a new drive, it wasn't recognized:
[root@fs-2 ~]# tail -18 /var/log/messages
May 5 16:54:35 fs-2 kernel: ata1: ...
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How can I successfully mount an 8-bit SCSI drive on a modern computer?
I have a number of internal 8-bit SCSI-1 drives that I'd like to archive for historical purposes. These are all the old NeXT Cubes and NeXTStations (monochrome and color) that were used by id ...
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What does "- - -" in 'echo "- - -" > /sys/class/scsi_host/host0/scan' mean?
I know the linux command
echo "- - -" > /sys/class/scsi_host/host0/scan
is used to rescan scsi host. But what does "- - -" mean in the command?
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4
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How can I connect a SAS drive to USB?
I have a Dell T710 with Seagate Cheetah 15k.7 SAS disks. If the T710 motherboard dies, I'll need to resort to one of my nightly off-site backups and salvage the journal/logfile from the SAS disk to ...
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3
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SAS vs Near-line SAS vs SATA
I'm unsure about the differences in these storage interfaces. My Dell servers all have SAS RAID controllers in them and they seem to be cross-compatible to an extent.
The Ultra-320 SCSI RAID ...
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1
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scsi and ata entries for same hard drive under /dev/disk/by-id
I am trying to set up a ZFS pool using 4 bare drives which I have attached to my Ubuntu system via a SATA hot swap backplane.
These are Hitachi SATA drives. When I list the contents of /dev/disk/by-...
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7
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SCSI vs SATA? Is SCSI "actually" better? [closed]
Well, I was talking with a guy about servers the other day. I was a bit shocked whenever I asked him if there was any significant difference between SCSI and SATA and why he always uses SCSI. (note, I'...
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Harddisks falling offline for unknown reason
I have 7 systems running the setup below. Now and then a different disk falls offline, but on closer inspection the disk is good and not faulty and works flawlessly for at least another year. Since ...
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Still getting aacraid: Host adapter abort request errors after following recommended steps
I am getting the infamous aacraid: Host adapter abort request error with my new Adaptec RAID Controller under high I/O. I have read several forums, even Adaptecs, that setting the /sys/block/sdX/...
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Is there way to read sectors from SATA drive without ECC correction?
I know, there was such possibility like that in old ATA standards: "READ LONG" command produced LBA sector + ECC payload. sg_read_long supports in in linux, but the command is obsolete for quite a ...
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1
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Can I dynamically expose an entire SCSI host over Fibre Channel, preferably in Linux
Is it possible to expose an entire SCSI host dynamically (an LSI HBA or RAID card) over Fibre Channel, if so how?
Preferably on Linux (perhaps targetcli) and with disk hotplugging support. (i.e. ...
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3
answers
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Creating a physical SCSI target out of an iSCSI one
I find myself having to maintain some old hardware for some legacy applications. These computers use old parallel SCSI drives, and when those drives die, I have to scavenge for new ones, which is ...
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How does Linux determine the SCSI address of a disk?
Greetings,
I'm working with RHEL 5.5 guest VMs under VMware ESX 4. When I configure the virtual disks in the VM hardware settings, each disk has a SCSI address in the format "N:M". For example, "1:3" ...
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1
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Recover data from SCSI hard disk
We've got an old server with SCSI hard disk. The server crashed last week and it isn't exactly known what hardware component is damaged. Since the server is due to be retired anyway we don't want to ...
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HP ProLiant DL380 G4 SATA support? [closed]
I'm planning to get a second hand HP Proliant DL380 G4 and setup it as storage server, probably using NexentaStor and setup a ZFS system.
But now I wonder does DL380 G4 can be convert or support SATA ...
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4
answers
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Performance differences between 2.5" vs. 3.5" SAS
What real performance gains/losses are there on 2.5" vs. 3.5" 15k SAS drives. Are folks really seeing seek differences, &c?
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1
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HP Ultrium 1840 LTO-4 slow write speeds
I have an HP StorageWorks Ultrium 1840 LTO-4 external tape drive attached to a machine running Ubuntu 18.04.4 LTS (kernel 4.15.0-99-generic) using an LSI20320IE PCI-X x4 SCSI adaptor with a VHDCI to ...
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Hot Swap Ultra320 SCSI LTO-Tape Drive
Can an Ultra320 SCSI LTO tape drive (or any SCSI device) be hot swapped without needing to power down the system? The current LTO tape drive is the only device on the SCSI host.
If the above can ...
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1
answer
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Network Drive attached as SCSI Dropping the W/R speed on bigger files
I'm having Network disk attached a SCSI disk
When copying smaller files like 700MB or even 1 GB, speed is high , from 90MB/s to 120 MB, so I'm capable to benefit from 1Gbit network.
But if files is ...
user387694
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3
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SCSI disks capped at 40 MB/s
I have a batch of SCSI disks and a controller; the drives are HP 72,8GB 10k RPM Ultra320 SCSI (model number BD07296B44), the controller is an Adaptec AIC-7892A U160/m, the issue is that I can't get ...
user186340
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2
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Hardware mods: kludging a conversion from U320 SCSI to SAS/SATA
I apologise if this isn't an appropriate question for this forum.
I've an elderly server that works well and that I'd therefore prefer not to scrap entirely. But I would like to replace the current ...
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4
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Ultrium 3 tape drive shoe-shining, 3Mb/s: and it's not the cable
I have a HP 960 Ultrium 3 tape drive. Since I got it, (second hand, £90) I've been experiencing shoe-shining. Writing with tar in Linux, I average about 3Mb/s write speed. I've tried replacing both ...
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1
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San lun wwid number 3 in front
I have a san lun in a linux server, using this following command I saw this:
scsi_id -g -u -s /block/sda
38001438005dea3760000700002660000 #3 number in front of wwid
sg_inq -p 0x83 /dev/sda | ...
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Choosing the right backup solution - SCSI vs SATA tape drives
I'm backing up about 100gb worth of data on backup exec and after much deliberation, have decided that tapes are worth another shot (after my ultrium decided to die and munch tapes). Bearing in mind ...
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Why is a single drive much faster than 4 of them in RAID5?
I have a 2005 vintage server (dual 3GHz Xeons, LSI53C1030T RAID/SCSI controller with 256MB cache, 8GB RAM) and I'm re-purposing it for some light VM storage duty.
First try to was to put 4x300GB ...
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Fibre channel: LTO tape overwritten on bus reset
There is a situation that we had at out customer that I'd like to understand better.
Here's what happened:
A library with LTO tape drives is connected to a fibre channel environment
Archiving ...
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2
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Understanding Linux SCSI queue depths
I'm experimenting with the effects of different SCSI queue depth values on a Dell server running CentOS Linux 5.4 (x86_64).
The server has two QLogic QLE2560 FC HBAs connected via multipathing to a ...
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Can I rely on scsi host numbers to always stay the same?
I want to detect whether a disk is attached to the correct sata-port. While lsscsi gives me some useful information about the used host, I was wondering whether the SCSI host number will always stay ...
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command line utility for linux to decode SCSI CDB
I need to see commands which send to my scsi device. I enabled scsi debug in kernel and got CDB. It looks like this: 2a 00 00 a0 09 90 00 00 08 00.
I'm searching for command line utility to decode ...
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How to enable space reclamation from KVM guest to ZFS zvol iSCSI target?
I have a ZFS volume "tank/kvm/webhosting", exposed through iSCSI (using tgt) to KVM guest.
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native' ...
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Why are these SCSI drives always clicking?
I have two 9 GB SCSI hard drives in my very low volume web server. (We need to put some larger ones in soon but they're good enough for now.) Since the day we setup this server, back in 2003, the ...
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How do I power SATA drives in my DELL poweredge 2850?
I have a Dell 2850 which I've been fairly happy with. It runs RAID 5 to 6 Hot-swap SCSI drives, but I'd like to add some cheap storage. So I bought an Intel PCI-X SATA raid card and tried to install ...
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Linux SCSI Scan - is it still echo "- - -" in Linux 3.2
I'm working with attaching new SCSI drives to a virtual host, and the current method in my team's work instructions is to rescan the SCSI bus with:
echo "- - -" > /sys/class/scsi_host/host0/scan
...
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votes
4
answers
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Extracting data from a RAID 1 array with out original controller
A Dell x346 server crashed (motherboard went bad) and I need to get a few files off of the hard drive. They are 2 SCSI hard drives in RAID 1. As far as I know both drives are fine.
Can I just put one ...
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Is there a version of mt for windows, or something similar?
First of all, I'm not sure if this is the best place to ask this question. I was torn between SF and SU, but I decided for SF when I saw that questions about tape drives are scarce in SU.
I need to ...
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How to check Unmap event in windows server 2012 R2?
We have created few volumes in storage array. Via Iscsi initiator those volume have been added into host machine which is Windows 2012 R2. For few volumes when we delete the contents ,the volume size ...
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SATA disks being identified as SCSI
I have two identical servers with same hardware and cloned Linux OS. They both have Supermicro HBA AOC-S3008L. Yet one server identifies SATA disks as SCSI while the other one correctly identifies ...
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Tape drive unusable on 14.04 ESXi VM
The problem
I've got an Overland ArcVault connected to my system (actually a virtual machine, with the standalone SCSI card it's connected to in passthrough mode), but it seems like the named tape ...
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Ultra 320 SCSI termination
I want to connect an old 12-bay DataStor InfoStation (which is an external storage cabinet) to an LSI MegaRAID SCSI 320-2E host bus adapter and now wonder what bus termination guidelines to follow.
...
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How do you remove attached FC LUNS from CentOS 6?
We have a Qlogic QLE2560 HBA running on a Centos 6 server. I am needing to remove the attached LUNS remotely. I do not have any software from qlogic installed on the device. Their are 2 LUNS ...
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How do I put back different SCSI hard drives into their original RAID arrays across different servers?
I have potentially a big mess in my hands: I received today a box with several hard drives that used to be connected to different servers each one of them using an unknown - at least as of right now- ...
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1
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What are Linux SCSI command timeouts and is the default suited for software raid?
My understanding of SCSI timeouts is that any read, write, flush and other commands have a limited time to complete. If exceeded, the command is aborted and an error is reported to the upper layer. ...
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Raid 5 on two scsi buses with different maximum speeds
I'm quite a noob, I'm trying to set up as a study machine an old HP ProLiant DL385 G1.
I've configured a RAID 5 out of six SCSI 3.5" HDDs using:
- Smart Array 6i controller;
- (4 x SCSI Ultra320 36,...
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Linux Rhel5.6 : SCSI protocol version -- where is it defined?
In our environment, we have several storages cabinets connected to RH Linux servers. Depending on the storage cabinet connected to the host, some LUNs are seen using SCSI protocol version 2 (version=...
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SCSI disks in server
this will be maybe dumb question, but I want to be sure before starting doing anything. I have here Dell PowerEdge 2800 and needs to put into it another disk. The problem is that I took this drive ...
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How do I configure ZFS to panic on da (SCSI) disk failure?
Situation: two redundant FreeBSD machines using CARP to share a primary IP, running a frontend proxy (E.G. HAproxy or nginx)
Primary machine experiences a loss of SCSI disk (E.G. disk failure, SAN ...
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0
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Boot issue with Debian Stretch 9.4 (amd64) on Dell R710
I'm hoping someone has seen this and can assist. This is more of an annoyance than a true issue.
I have a Dell R710 stacked with Debian 9.4 (amd64). The physical unit has the following ...
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1
answer
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HP P812 attr_value_interface_phy_not_connected
We got an error on HP server with a HP Smart Array P812 and now 6 of the drives are missing.
the error seems to be attr_value_interface_phy_not_connected (See pic) and I found no reference anywhere on ...
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0
answers
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What causes SCSI command timeout over 30 seconds?
System description:
CentOS 7.
SuperMicro X9DRW-iF board.
Latest BIOS (and SCU option ROM), using SCU option ROM.
Four 300GB WD HDDs connected to the board's SCU.
Six HDDs connected to the six ...
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