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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48
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7answers
18k views

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 ...
42
votes
9answers
60k views

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 ...
19
votes
10answers
97k views

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: ...
11
votes
1answer
2k views

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 ...
10
votes
2answers
25k views

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 ...
10
votes
7answers
26k views

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, ...
8
votes
3answers
36k views

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 ...
8
votes
1answer
2k views

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 ...
7
votes
1answer
3k views

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 ...
7
votes
3answers
12k views

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" ...
6
votes
2answers
4k views

HP ProLiant DL380 G4 SATA support?

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 ...
6
votes
1answer
2k views

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 ...
6
votes
2answers
3k views

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 ...
5
votes
4answers
12k views

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?
4
votes
4answers
611 views

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 ...
4
votes
5answers
1k views

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 ...
4
votes
3answers
553 views

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 ...
4
votes
1answer
2k views

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 ...
4
votes
2answers
6k views

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 ...
3
votes
2answers
846 views

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 ...
3
votes
3answers
6k views

Formatting an HP ProLiant DL380 G4

I have an old HP ProLiant dl380 G4 server whose hard disk needs to be formatted. Unfortunately, I cannot seem to do so. For one, it doesn't seem to be detecting any Hard Drives attached to the Server. ...
3
votes
2answers
5k views

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 ...
3
votes
1answer
48 views

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 ...
3
votes
1answer
326 views

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- ...
3
votes
1answer
4k views

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. ...
3
votes
1answer
63 views

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 ...
3
votes
2answers
198 views

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 ...
3
votes
1answer
52 views

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 ...
3
votes
2answers
1k views

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 ...
3
votes
1answer
135 views

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 ...
3
votes
0answers
91 views

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 ...
3
votes
0answers
56 views

Mirroring on external SCSI and iSCSI disks inside same volume group

On IBM P5 505 (maint level 5300-07) servers there is a concurently accessed external storage, which is connected using external Ultra320 SCSI port (DAS). External storage is detected as hdisk2 which ...
3
votes
1answer
220 views

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 ...
2
votes
1answer
46k views

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?
2
votes
3answers
4k views

SAS vs SAS2 interface

I´m pretty new to this server environment and I´m looking to expand the capacity of our HP Proliant DL385 G2 server. I want to replace the 146 GB disks with 300 GB disks. My question is: Can I use a ...
2
votes
3answers
379 views

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 ...
2
votes
5answers
123 views

source for enterprise disks [closed]

whats your source for scsi/sas disks - to replace breakage or expand existing systems? the usual suspects (newegg, pricewatch, ZZF) seem to have limited selection.
2
votes
5answers
144 views

Seagate Cheetah Size

I just got some replacement drives for a server here, went to pop one in, and it turns out that the 72Gig for a Seagate is slightly below the 72gig of the Maxtors that we currently have. Does anyone ...
2
votes
2answers
86 views

redundancy in a single SCSI target

following-on from my earlier question about resurrecting an ancient Intergraph 6800 machine (licence file for extra logins on ancient Unix (CLIX) system), the original problem was a failed hard disk ...
2
votes
1answer
730 views

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 ...
2
votes
5answers
5k views

What is the best hard drive type for a small file server?

I have a fairly speedy computer that I'd like to use as a file server. The motherboard has IDE and SCSI ports. What is the best hard drive type to use? (IDE/SATA/SCSI, etc) Would it be smart to get ...
2
votes
2answers
557 views

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 ...
2
votes
2answers
1k views

How to set up an Infiniband SRP Target?

I want to set up a server as a SCSI Target. How good are the open source implementations? What is the tutorial one? How is performance and reliability? How dependent is the OS? How much is ...
2
votes
2answers
354 views

What kind of SCSI terminator do I need?

I'm connecting a PowerVault 114T tape drive to a server with an Adaptec 29160 SCSI card. I know i need a terminator on the tape drive, but not sure exactly what kind I need. Do I need a multimode or ...
2
votes
2answers
2k views

What is the SCSI RAID channels?

What is the SCSI RAID channels? I.e. what is the difference between, say, 1-channel RAID controller and 2-channel RAID controller? Is it for data throughput, number of RAID arrays I can create on ...
2
votes
1answer
123 views

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. ...
2
votes
1answer
2k views

How to get HDD parameters from SCSI controller

The SCSI controller we are using is IBM RAID M1015 and a SATA 3 HDD is attached to it. Now the question, is there any way to get the HDD specific parameters like HDD Model number/Manufacturer, Storage ...
2
votes
1answer
2k views

Solaris 10 new disk discovering

I'm having issues with a Solaris 10 SPARC host... It seems not able to discover newly provisioned disks. The disks are fed through a QLogic 2300 FC HBA. I've tried cfgadm -al/cfgadm -f -c configure ...
2
votes
3answers
948 views

Symantec backupexec troubleshooting issues with a Dell Robotic tape Library in Windows 2003

I’m running Symantec BackupExec 12.0 on a Windows 2003 server. After I powered down my SCSI tape drive (Dell PowerVault 124t autoloader) it no longer shows up in Backup Exec in the device pool. So ...
2
votes
1answer
327 views

SCSI Windows NT from vmware to virtualbox [closed]

We are trying to virtualize an old Windows NT 4.0 server in a bad shape. We've managed to create an vmdk image using vmware converter coldclone boot cd and we can successfully run it on vmware ...