Hardware :: Rescan Disks Without Doing Reboot
Mar 5, 2010
I would like to scan the SAN diskspace on one of the company's RH Server. I can see that 2 Emulex Lightpulse FC has been installed before. But I am not sure whether the correct driver has been installed by the previous admin. From Emulex manual, it says I should see 2 HBA cards when I do lpfcutil LISTPATHS but I don't see anything. When I do lsmod, I can see lpfc but it is not being used. I also tried /usr/sbin/hbanywhere but it says module not installed So now, I am lost on how I will rescan the disks without doing a reboot.
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Jun 20, 2010
Basically, I installed Debian Lenny creating two RAID 1 devices on two 1 TB disks during installation. /dev/md0 for swap and /dev/md1 for "/"
I did not pay much attention, but it seemed to work fine at start - both raid devices were up early during boot, I think. After that I upgraded the system into testing which involved at least upgrading GRUB to 1.97 and compiling & installing a new 2.6.34 kernel ( udev refused to upgrade with old kernel ) Last part was a bit messy, but in the end I have it working.
Let me describe my HDDs setup: when I do "sudo fdisk -l" it gives me sda1,sda2 raid partitions on sda, sdb1,sdb2 raid partitions on sdb which are my two 1 TB drives and sdc1, sdc2, sdc5 for my 3rd 160GB drive I actually boot from ( I mean GRUB is installed there, and its chosen as boot device in BIOS ). The problem is that raid starts degraded every time ( starts with 1 out of 2 devices ). When doing " cat /proc/mdstat " I get "U_" statuses and 2nd devices is "removed" on both md devices.
I can successfully run partx -a sdb, which gives me sdb1 and sdb2 and then I readd those to raid devices using " sudo mdadm --add /dev/md0 /dev/sda1 ". After I read devices it syncs the disks and after about 3 hours I see fine status in mdstat. However when I reboot, it again starts with degraded array. I get a feeling that after I read the disk and sync array I need to update some configuration somewhere, I tried to " sudo mdadm --examine --scan " but its output is no different from my current /etc/mdadm/mdadm.conf even after I readd the disks and sync.
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Jan 29, 2010
I have installed an old HP Scanner on my Fedora 11 system, and it works great. The scanner is connected through a SCSI, and it gets recognized at boot time if the scanner is ON. However, if the scanner is OFF, I need to turn ON the scanner and reboot the workstation for the SCSI devise to be recognized. Is there a way that I can rescan the SCSI devise without rebooting?
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Feb 25, 2010
I have servers which contain SATA disks and SAS disks. I was testing the speed of writing on these servers and I recognized that SAS 10.000 disks much more slowly than the SATA 7200. What do you think about this slowness? What are the reasons of this slowness?
I am giving the below rates (values) which I took from my test (from my comparisons between SAS 10.000 and SATA 7200);
dd if=/dev/zero of=bigfile.txt bs=1024 count=1000000 when this comment was run in SAS disk server, I took this output(10.000 rpm)
(a new server,2 CPU 8 core and 8 gb ram)
1000000+0 records in
1000000+0 records out
1024000000 bytes (1.0 GB) copied, 12.9662 s, 79.0 MB/s (I have not used this server yet) (hw raid1)
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Mar 31, 2010
I have/had a PC with several hard drives, and a mix of ubuntu and windows on multi boot.The old boot drive died screaming, and I need to start again. (But my data is safe! yay!)
Is there anything special about which drive can be the main drive to start booting from? Or to put it another way, can I install to any of the other 3 and expect it to work, or do I need to switch them around so a different drive is on the connections for the recently dead one?
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May 4, 2011
I'm working with Linux 2.6.23 on an embedded device and am receiving the following error executing the reboot command.
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Oct 7, 2010
I am using sda1 as /, which is a bootable drive. I do not know if my problem is that I did not create a /boot drive. After removing the iso dvd, I tried to reboot and I get this back: -bash: /sbin/reboot: input/output error Then it returns me to the terminal prompt.
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Feb 16, 2011
last -a shows server rebooted, how to identify the source or cause of reboot? thx reboot system boot Wed Feb 16 08:52 (02:0 2.6.21.7-2.fc8xen
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Apr 28, 2010
Got a couple of the disk on the SAN and I can't tell if they're being used - whats the easiest way to get the LUN ## of the disks
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Mar 25, 2010
Further to this LQ thread which Tinkster solved by suggesting the last command (thanks Tinkster) I have been exploring last -x reboot and have found that the reported duration is incorrect for the last reboot and shutdown when a old wtmp file is used. Not having a record for the following shutdown, last assumes that the system has been up until the current time and similarly for the shutdown.
The output comes in time order, latest first, each line showing the time of the reboot and the uptime from then to shutdown. Using last -x reboot shutdown to show the shutdown time, here's an illustration
Code:
shutdown system down 2.6.29.6-smp Sun Mar 7 15:35 - 03:02 (11:27)
reboot system boot 2.6.29.6-smp Sun Mar 7 09:35 (05:59)
09:35 until 15:35 is 05:59.
When the uptime exceeds 24 hours it is shown as (<days>+<hours:minutes) like this
Code:
shutdown system down 2.6.29.6-smp Sun Feb 21 12:39 - 13:20 (00:40)
reboot system boot 2.6.29.6-smp Sat Feb 20 09:39 (1+02:59)
09:39 until 12:39 the next day is 1 day 02:59.
The time in parentheses at the end of the shutdown lines is normally the time until the next shutdown.
So far so good. The incorrect output is for the last reboot and shutdown of an old wtmp file. Here's the output of last /var/log/wtmp -x reboot shutdown; last -f /var/log/wtmp.1 -x reboot shutdown
Code:
[snip]
reboot system boot 2.6.29.6-smp Fri Mar 12 07:42 (01:54)
shutdown system down 2.6.29.6-smp Fri Mar 12 01:31 - 09:37 (08:05)
wtmp begins Thu Mar 11 08:25:26 2010
[snip]
reboot system boot 2.6.29.6-smp Wed Mar 10 14:12 (15+01:42)
shutdown system down 2.6.29.6-smp Wed Mar 10 12:41 - 15:54 (15+03:13)
[snip]
The boot started at "Wed Mar 10 14:12" which had an actual uptime of 1 day 11:20 is reported as 15 days 03:13 which is the time from then until the last -f /var/log/wtmp.1 -x reboot shutdown command was issued. The time from shutdown to shutdown is similarly affected.
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Jan 20, 2011
I'm running opensuse 11.2 with gnome. When I plug in a USB disk. It automatically mounts those partitions that it recognizes. I'd rather it didn't. It creates icons on the desktop although I've managed to stop it opening a file manager window for each partition.But how do I stop the mounting altogether? I've looked in the menus, yast, gnome control centre and sysconfig editor but haven't found anything. And google hasn't given me any clues.
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Aug 18, 2011
i just install lubuntu and everything is work but it can`t` see my usb flash disks , usb ports is working because when i plug there my mouse it begin to work
is any solution?
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Mar 17, 2011
Is there a way to find the wwn id of disks mounted on a centos server. I am using san disks via iscsi connection.
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Feb 14, 2010
i installed fedora 11 linux in my computer.but after successfull installation,i see that a message near the taskbar that "A hard is failing". what is that suppose to mean?
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Oct 15, 2010
A small combined webserver and fileserver with focus on power consumption and storage size, what would be a cheap and stable solution to this in terms of hardware ? I'm not interested in NAS solution only servers ..
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Jan 25, 2011
I'm a storage engineer by trade and have mapped a RHEL 4 server, several LUNs. I've mapped each (HBA Initiator) 4 times to seperate fibre channel ports on a storage array.Is there a RH command to see the device mapped 4 times to the target. I would expect to see something in the output that has the subsystems WWN, such as -
... 50060F9004563210
... 50060F9004563220
... 50060F9004563230
... 50060F9004563240
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Aug 14, 2015
When booting, the grub menu appears and allows me to boot from the internal hard disk (sda) any OS there, such as WHEEZY (sda9). On the external disk (sdb) there is a dd'd copy (not an installation) of SQUEEZE (sdb1), which at one time was on sda but which has different partition assigments listed in its grub.cfg than the current ones shown below for sda.
Code:
Select allNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 111.8G 0 disk
├─sda1 8:1 0 23G 0 part
├─sda3 8:3 0 1K 0 part
├─sda5 8:5 0 3.9G 0 part [SWAP]
├─sda6 8:6 0 11.7G 0 part
├─sda7 8:7 0 19.5G 0 part /home/norman/data
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Can I manually boot the SQUEEZE copy on sdb1 using grub commands (set, linux, initrd, boot) without disturbing the WHEEZY and other OSs on sda? Or will they be disrupted?Alternatively if for example JESSIE is installed in sdb3, for example, can it be booted similarly without affecting the installations on sda? I hesitate to try this by trial and error because of the work and time involved in rebuilding messed-up OSs to their desired configurations.
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Sep 13, 2011
I am planning in near future(about a month or two) to build a new computer. There be a least two phisical disks - one for OS an another for data or backup. One disk to be a small(60-80 GB) SSD, another to be a HDD of 1 TB or bigger.
I have a few questions:
Is Linux(openSUSE in my case) work with SSD? It is possible to install Linux on two disks - in my case /swap, /boot and /root partition to be on SSD and /home partition on larger HDD?
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Jul 18, 2010
I installed K3B 2 today on opensuse 11.2, hoping that something may have been done to make it burn disks, I've had these problems since opensuse 11.0.
When I try to burn a cdrw disk it usually fails with the error that the cd drive doesn't like the disk, if I try and expensive disk I sometimes get the same error, but if it does burn successfully and I put the disk back in the drive all I've got is a blank disk which won't take a 2nd burn.
I've tried DVDRWs and as soon as I click burn K3B decides the blank disk needs formatting and this then fails and keeps failing nomatter what I do. If I choose the ignore option for the speed when formatting it seems to format the disk then it takes between 1 & 3 attempts to burn the dissk.
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Dec 27, 2010
Does anyone know about any usb ssd disks which work with Linux, and which Linux can boot from? If the disk also have a sata connector it will be even better.
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Jan 18, 2010
log in ubuntu (i use Ubuntu v9.04) , and i go to Places->Computer, but i can't access to my local disks?A notice of error is:Code:Could not display "computer":Nautilus cannot handle "computer" locationsWhat's this error? How to fix it or only reinstall Ubuntu?And i have another question: How to install GTK+ , i want to find GTK+ deb file, but i can't. I install GTK+ by compile source code, but when i compile, in my ubuntu don't find package ATK,cairo.... But i don't know exact what's ATK, cairo. I can't find it.
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Feb 7, 2010
I'm browsing on my phone which is not letting me scroll to the end of this text box so I will say thank you in advance for any replies now.After my computer was switched off abruptly after a power outage I have many errors upon booting. My hard drive setup consists of a RAID0 array of two 500GB sata disks. The partition table (from my head!) goes like this:50GB NTFS Windows XP /c/50GB ext4 Ubuntu 9.10 /4GB swapThe rest is a large NTFS partition all the way up to the end of the array at 987GB. Mounted at /media/share/I am thinking I will have to start again (I won't lose much, I have recent backups), but what is the best way of restoring the system as much as I can? Currently my computer has been booted into Ubuntu for over an hour, and after pressing ctrl+alt+shift+F2 I can see that it is finding errors still, now at sector 6008. Should I let this run its course or REISUB it and boot onto a live CD. I think the main problem is with an NTFS partition
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May 15, 2010
Ever since my upgrade from 9.10 to 10.4, every time I reboot the system it does a full disk check. /var/log/boot.log tells me that fsck thinks that the file systems contain errors or that it wasn't cleanly unmounted. And yet, it doesn't seem to actually find errors, and a clean reboot starts another check (again with it thinking something is dirty). I dual-boot with Windows, and reboot from there with the same problem.Again, all of this is new with 10.4 and was not happening with 9.10.Is there a way to find out when/how/why the disks are not being unmounted cleanly?
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Aug 31, 2010
On my desktop, I try to instantly put some disks into sleep using hdparm, for some tests. Though the disks are unmounted, they wake back up in seconds. How can it be? How can I track which process wakes a disk up with what operation? I think unmount disks should default to standby during system load.
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Dec 30, 2010
I just bought a 3TB drive to use for backups and I'm getting a strange message when I run fdisk to get a listing of the drives.Here's what fdisk says about the 3TB drive:
Code:
Disk /dev/sde: 3000.6 GB, 3000592977920 bytes
255 heads, 63 sectors/track, 45600 cylinders
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Jan 30, 2011
I'm having two hard disks in my pc. I can easily access both of them from my windows. But in case of ubuntu i can access only that hard disk on which ubuntu is installed. The other hard disk can not be accessed from ubuntu.
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Mar 25, 2011
Anyone know of a free mounter I can use with Ubuntu 10.10 for putting OSs on disks?
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Apr 9, 2011
I am attempting to install ubuntu 10.10-alternate-i386 that was burned on a cd.
Motherboard: SOYO SY-K7ADA v1.0-2AA1
Main Processor: AMD Athlon 1700+
Primary Master: WDC WD800AAJB-00J3A0 0.103E01
The HDD is brand new and hasn't been formated, partitioned, or previously had any other OS on it. The HDD is recognized in the BIOS.A list of possible drivers are listed in which don't match, except for two, but they don't lead to anywhere beneficial in order to complete the installation process.At this point, I have no idea how I must proceed.
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Apr 29, 2011
I did a fresh install of 11.04. It didn't let me choose custom mount points for my disks, so I left non-system partitions unmounted in the installer. Big mistake. It seemingly screwed with two of my disks. I can see them in disk utility, but disk utility cannot identify partition information.
@fridge:~$ sudo mount /dev/sde1 /m2 -t ext4
mount: wrong fs type, bad option, bad superblock on /dev/sde1,
missing codepage or helper program, or other error
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May 16, 2011
The reason I'm here today is because wine seems to have changed quite a bit. It used to be simple and I only need it for a couple of programs called dvd decrptor and dvd shrink. I've tried some programs in linux and haven't been able to get them to work, like DVD 5. It could be me, of course! So, I haven't been able to get wine to read my cd-rom hardware to where I can back up my dvds. Are there any solutions that anyone knows of on Wine or linux programs which I prefer? I did create an iso from a dvd with DVD 5, I believe, and then had it set up to burn with k3b. The first part of the dvd came up with the menus and music, but I could go no further than that. I figure there is some little something that I'm doing wrong or some bit of linux software suport for DVD 5 or k3b that I do not have. That's usually what it is.
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