Server :: RHEL5 ISCSI Not Creating New Block Device In /dev
Jul 9, 2010
I am running RHEL5.5 its a fresh install and we are testing Xen Virtualization. We are wanting to use our iSCSI SAN for the VMs. I have created the initiator iqn, and discovered the target address. We are connected to the target, but there is no new block device in /dev.
[root@xxxxxxxx etc]# netstat -a | grep iscsi
tcp 0 0 *:iscsi-target *:* LISTEN
tcp 0 0 xxxxx-netapp.okc-:44840 xxxxxx-iscs:iscsi-target ESTABLISHED
tcp 0 0 *:iscsi-target *:* LISTEN
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Jul 19, 2010
I'm trying to increase the size of an iSCSI device. On the LUN side, the provision size has been expanded already. I expanded the size of this device from 15GB to 30GB.
I then rescanned the devices:
[root@ps-dev-nfs ~]# iscsiadm -m node --targetname iqn.2001-05.com.equallogic:0-8a0906-db7938c02-c6a994bda8a4a773-ps-dev-nfs -R
Rescanning session [sid: 1, target: iqn.2001-05.com.equallogic:0-8a0906-db7938c02-c6a994bda8a4a773-ps-dev-nfs, portal: 10.3.2.10,3260]
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Sep 2, 2010
how can we achive more than 8TB size for one LUN.?I am getting following error..
[root@storage ~]# mke2fs -j /dev/VG01/data
mke2fs 1.39 (29-May-2006)
mke2fs: Filesystem too large. No more than 2**31-1 blocks
(8TB using a blocksize of 4k) are currently supported.
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May 25, 2011
How to connect disks from iSCSI array and from SAN network. I found that it is possible to establish iSCSI on solaris by using COMSTAR [url]
Questions: Could you give me some tutorial how to do this ? I don't have of course SAN network in my home lab and iSCSI array too, is there some way I can simulate this on VBOX or VMWARE ?
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Mar 15, 2011
I want to keet some data on windows dir. I have tried the below command and giving the below error.
[root@xyz0044 ~]# mount -t cifs //10.48.64.52/jata -o username=domainv.kumar3,password=xxxx /mnt/backup
mount: block device //10.48.64.52/jata is write-protected, mounting read-only
mount: cannot mount block device //10.48.64.52/jata read-only
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Aug 17, 2010
I'm running 10.04 64-bit diskless on ESXi, installed as a minimal virtual machine. I want this server to access an iSCSI drive. The machine can view the iSCSI shares with iscsiadm, and can even log into the drive. When I do an iSCSI login, this appears in /var/log/messages:
Aug 17 11:08:21 ubuntutest kernel: [1123295.329972] scsi4 : iSCSI Initiator over TCP/IP
So, it appears that open-iSCSI is working correctly. But no new /dev/sd* nodes appear, and nothing new appears in /dev/disk/by-path. I'd expect to see /dev/disk/by-path/ip-XXXXXXXXX. fdisk -l shows nothing but the boot drive. My guess is that the "minimal kernel" doesn't include some necessary module or driver.
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Oct 28, 2010
I'm running Ubuntu Server 10.04 to provide DHCP and Internet Sharing on my home LAN. In a previous configuration, I was running Fedora + AMAHI to provide the same services. As most of my linux devices are Ubuntu, I decided to decommission and rebuild my server. I've been able to configure all of my services with the exception of one. As a rule, I assign static IP or reservations based on MAC address's for any of my network devices or appliances.
One cool feature that AMAHI provided a GUI for, was the ability to recognize devices by name as well as IP. i.e.. "http://192.168.1.50" or "http://home-NAS" Going from memory, the long name upon first entry may actually have been "http://home-NAS.adomainname.com"? From my reading, I think I either need to setup up a Static Alias or CNAME for each assigned IP. I can't find any tutorial's that will walk me through this process. I'm guessing I need to generate the records under one of the master DNS zones, but that is just a guess?
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Nov 15, 2010
I have a server wich is connected to an iSCSI storage and gets harddisks from this storage. Sometimes I have to add new disks to this server. Everytime I add a disk and make an /etc/init.d/iscsi restart on the server the disks don't have the same device name as before the iscsi restart.
It should be possible to gave the disks persistent names using udev rules. Now I tried to create different rules in "/etc/udev/rules.d/99-static-iscsi-names.rules" e.g.
# /dev/sdc
KERNEL=="sd*", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -s %p",RESULT=="360a98000503355344c4a576864467877" NAME=="sdc%n"
In "/etc/rc.local" I added "/sbin/start_udev" and in "/etc/scsi_id.config" I added the line "vendor="NETAPP",model="LUN",options=-g"
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Apr 6, 2010
i need help to create a PPPoE Connection ( Breoadband)using RHEL 5 cz my ISP use this type of connection .Plz if there is someone can show me the procedure step by step.
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Aug 10, 2009
I am working to create a new base image for our RHEL5 setups, and I wanted to make sure we are creating a functional, but secure, image. Can anyone point me to some writeup's that might provide some illumination on this potentially daunting task? Basically, I'm concerned about what packages are okay, which should be avoided, and what other caveats that I might not think of when putting this together.
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Jun 24, 2010
I have never done this before but stood up a new Debian (testing) x64 system. It only has 146GB available for RAID1 so I created a 500GB iSCSI LUN on my NAS device on the network and am really confused how I can attach my Debian to the iSCSI LUN I created. Right now the OS is installed all locally on the machine but I would like the iSCSI LUN to be the /home directory for mail storage. Is this possible or do I need to mount the LUN to a newly created folder / mount point that is locally attached?
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Apr 5, 2010
How to setup Dynamic Multipathing in RHEL5 and mapping a device to it? I have a RHEL5 server which is connected with a HP BLADE Server. I have installed DM software. Now I want to map BLADE Server's LUN space with a directory of my RHEL5 Server.
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Dec 1, 2010
I am final year MCA student. I like to do my project in Linux. I know a little in C. I am pursuing RHCE certification. I am using rhel5. I am interested to write linux device drivers and willing to do my project in that.
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Nov 30, 2010
Is there an easy example of a block device driver I could follow as a guide to write my own module?
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Apr 7, 2010
I have an external hard disk drive and I would like it to be recognized with the same name (e.g. /dev/sbd) after each boot.
Is there any way to make that?
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Jun 1, 2010
I want to test LVM+Raid. When I was testing ZFS on Solaris, I was able to create regular files, and use those as disks for testing.I tried creating a regular file full of zeros w/ dd, then partitioning that. fdisk seemed to be able to create a partition on the regular file, but mkfs and parted couldn't work with it. Is there any way to create fake block devices for testing?
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Jun 14, 2010
When I try to mount the /dev/sdd1 device then it give errormount -t ext3 /dev/sdd1 /4hdmount:/dev/sdd1 is not a valid block device
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Apr 25, 2010
I created LVM and formatted it. But at the time of mounting it getting this error message ".....not a block device".
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Oct 16, 2010
How do you go about getting the raw size of a block device under Linux from within a C program? And I mean the raw size of the block device itself, not a file system that may or may not be installed on it. And I'd like to be able to get the raw size of any block device, from hard drives (e.g., /dev/sda) to LVM partitions (/dev/mapper/vg0-home) to loop devices to anything else that is a Linux block device.
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Jul 7, 2011
I am interested in turning my home server into something that I can store backups on. I do photography and therefore have a lot of photos. I use Mac OS X for my photo editing, so it must be accessible from my Macbook. I am new when it comes network storage servers, so what would be the best solution for me to be able to backup my photos seamlessly? I would like it easy enough so others can backup files without any terminal commands and such. What would you suggest? CIFS? RAID? iSCSI?
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Sep 3, 2009
I built a CentOS 5 Linux cluster with GFS storage using local RAID volume and share it with gnbd_export/import on two web-servers. Now I need to expand that storage to another servers local volume. I saw the picture in the manual, but I don`t know, how can I create that scheme.
I can use gnbd_export on the second server and gnbd_import on the first. In that case I will have two volumes on the first storage and I can expand volume group, logical volume, etc on it.
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Mar 9, 2010
What is the correct way to allow two servers to use the same file system on a SAN using iSCSI?Is it GFS on the two servers?
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Apr 22, 2010
Is it possible somehow to block some bluetooth device with specif address (mac) ?
(like iptables block by mac)?
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Feb 13, 2009
I'm setting up a machine that's going to be used to test randomly connected tape drives one at a time, and as such, I'm writing the test routine using mt in a bash script, for user-friendliness. The problem is the block device name changes on occasion as tape drives are swapped out and busses are rescanned, so I can't "hard code" a block name into the script.
I know programs like lsscsi and hwinfo will give you block device names as part of their output, but I can't seem to grep anything in such a way as to have the final output be just the block name (ie /dev/st2, or optimally 'st2'), so that I can just have the script read said output, and drop it into the necessary variable.
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Jan 19, 2011
I built a Raid5 volume with 3 SATA II hard disk drives. Further I have a system disk conected through IDE. During the first setup the IDE disk becomes sda, the SATA II disk sd[bcd] respectively. Now, sometimes the device names change after reboot - why ever... E.g. one of the raid5 disk become sda and so I got an error message during the boot procedure regarding the raid set. Curious, when the system is up and I stop and restart the Raid5 volume it comes up and runs fine. Because I'm currently at work I can't post any more detailed config files at the moment.
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Jul 4, 2011
I am trying to debug the issue of a desktop that has for the last two weeks started having kernel panics at boot time. This machine has been running flawlessly for the last 8 years, and has had three OS upgrades. I am using memtest to try to understand the issue. The following is part of the memtest output: Reading all physical volumes Buffer I/O error device hdc logical block 0 Buffer I/O error device hdc logical block 15
Illegal node for this track or incompatible media (asc=0x64 ascq=0x00) The failed "Read 10" packet command was /dev/hdc: read failed after 0 of 4096 at 0 Input/output error and similar set of mesaages After this udev checks correctly, and hardware, storage and audio are initialized However sometime in the middle of the boot process, a kernel panic occurs with message Kernel panic -- not symcing : Fatal exception in interrupt
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Nov 2, 2009
* I am implementing mass storage device on a test board.
* It contains NAND flash.
* Using corresponding "udc driver" and "g_file_storage" I could make my test board enumerate as mass storage device on my Linux machine.
* my 16 MB pen drive (test board) is now ready for read/write.
But there are some Bad Blocks on the NAND.Hence copy is not complete. Although on Linux machine there is no error message. Now , what is there in a normal pen drive which manages the Bad Block or what am I missing so that such Bad Blocks are managed.
Here is the error I get on my test board :
mtdblock: erase of region [0x2c0000, 0x4000] on "Bon 2" failed
end_request: I/O error, dev mtdblock2, sector 5664
Buffer I/O error on device mtdblock2, logical block 708
[code]....
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Nov 1, 2010
I have a write call to a ttyACM serial device that blocks after several hundreds bytes are written.I'm writing in ~25 byte chunks, so I have 5-8 successful writes, then the next write blocks forever.I can bypass the blocked call using select, but I can never call write again without closing and re-opening the port.
The serial port is opened correctly because I can read from it just fine. Write permissions are correct, and it's opened RW.The code is likely correct because I tested the same code using the same device on a pure RS-232 serial port, and it worked fine - no block. Is there anything to know about the linux ACM module?It's my understanding that write calls basically shouldn't block.They're supposed to return -1 if there's an error.
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Feb 1, 2011
I'm trying to make a fresh install of Ubuntu 10.10 Server 64bit but is stuck with the Partitioning Disk part and Ubuntu 10.04 LTS provides the same error. The installation wizard gives me a menu:
!! Partitioning disks
This menu allows you to configure iSCSI volumes
iSCSI configuration actions
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Sep 28, 2010
I am trying to connect the one of server RHEL5.4 to the IBM iSCSI storage. Server is equipped with 2 single port Qlogic iSCSI HBA(TOE). RHEL detected the HBA and installed driver itself (qla3XXX). I have configured the HBA ip address in the range of iSCSI host port of storage. Both of the HBA is connecting to the two different controller of storage. I have discovered the storage using command iscsiadm -m discovery command for both of the controller and it went through fine. But problem is whenever server is restarting if both of the hba is connected to the storage then server will not detect the volumes which is mapped to the server and then to detect the volume I need to run "mppBusRescan" and "vgscan" command each time. If only one path is connected it is fine.
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