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Un Installing a hard drive in a Centos 5.1 box
by Pam Astor 23 Mar '08

23 Mar '08

>>>>>I'm fairly new to Linux and I'm trying to un install a hard drive from my Centos 5.1 >>>>>box running KDE. When I built the PC, I installed two 500 gig maxtors in the tower, >>>>>then I installed Centos. Now I've decided that I want to remove the slave drive and >>>>>use it as an external backup drive - I am mounting it into one of those external >>>>drive cases with a built in fan. >>>>> >>>>>When I physically removed the drive and restarted the PC, centos would not boot up and >>>>>went into a kernel panic. I'm sure I'm supposed to somehow unmount the thing before >>>>>I do this, and that's my question - how do I un-install the hard drive - software >>>>>wise - so that on next boot up, centos don't go crazy looking for it? >>>> >>>>run >>>># mount >>>>this will show the mounted partitions. find the partitions that are on >>>>the second drive and unmount them: >>>># umount /path/to/partition >>>>if a service uses them, you'll see an error. you will need to fix the >>>>errors until you can unmount them. >>>>then comment out these partitions in /etc/fstab. >>> >>>OK this is what I have when I run mount - does it appear that >>>I have both drives on one volume?: >>> >>> >>> /dev/mapper/VolGroup00-LogVol00 on / >>>type ext3 (rw) >>>proc on /proc type proc (rw) >>>sysfs on /sys type sysfs (rw) >>>devpts on /dev/pts type devpts >>>(rw,gid=5,mode=620) >>>/dev/sda1 on /boot type ext3 (rw) >>>tmpfs on /dev/shm type tmpfs (rw) >>>none on /proc/sys/fs/binfmt_misc type >>>binfmt_misc (rw) >>>sunrpc on /var/lib/nfs/rpc_pipefs type >>>rpc_pipefs (rw) >> >>If the machine panics at boot time, there is a good chance that you >>installed with LVM and its got both the drives into one volume. You will >>need to reinstall that second harddrive, then work out the process of >>shrinking the filesystem down to only 1 drive, then remove the second >>drive. The scope of this work might be too much for an email, so I can >>best point you at the LVM HowTo. There are also some good lvm tips in >>the CentOS5 docs ( http://www.centos.org/docs/5/ ) >> > >am Astor wrote: >> OK this is what I have when I run mount - does it appear that >> I have both drives on one volume?: >> >> /dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw) >> >> >>what output to do you get from : >>pvdisplay; vgdisplay; lvdisplay >[root at localhost ~]# pvdisplay; vgdisplay; lvdisplay > --- Physical volume --- > PV Name /dev/sdb1 > VG Name VolGroup00 > PV Size 465.76 GB / not usable 9.50 MB > Allocatable yes (but full) > PE Size (KByte) 32768 > Total PE 14904 > Free PE 0 > Allocated PE 14904 > PV UUID IAmE1f-dCMo-c035-cSQQ-g9yE-6yOo-mfKhHv > > --- Physical volume --- > PV Name /dev/sda2 > VG Name VolGroup00 > PV Size 465.66 GB / not usable 3.56 MB > Allocatable yes (but full) > PE Size (KByte) 32768 > Total PE 14901 > Free PE 0 > Allocated PE 14901 > PV UUID fi5A7U-dao0-ruuP-TSc0-LfFu-7yRL-iKnwGr > > --- Volume group --- > VG Name VolGroup00 > System ID > Format lvm2 > Metadata Areas 2 > Metadata Sequence No 3 > VG Access read/write > VG Status resizable > MAX LV 0 > Cur LV 2 > Open LV 2 > Max PV 0 > Cur PV 2 > Act PV 2 > VG Size 931.41 GB > PE Size 32.00 MB > Total PE 29805 > Alloc PE / Size 29805 / 931.41 GB > Free PE / Size 0 / 0 > VG UUID pwO7bQ-0eRs-W8O4-b4uf-hYe6-JIm6-27p8wu > > --- Logical volume --- > LV Name /dev/VolGroup00/LogVol00 > VG Name VolGroup00 > LV UUID avhFcY-30N6-2BPz-A89X-Ai0V-v5B7-xxzhIe > LV Write Access read/write > LV Status available > # open 1 > LV Size 929.47 GB > Current LE 29743 > Segments 2 > Allocation inherit > Read ahead sectors 0 > Block device 253:0 > > --- Logical volume --- > LV Name /dev/VolGroup00/LogVol01 > VG Name VolGroup00 > LV UUID ZW2z5f-5x58-0vDI-ru5S-iZge-mVE6-yVp160 > LV Write Access read/write > LV Status available > # open 1 > LV Size 1.94 GB > Current LE 62 > Segments 1 > Allocation inherit > Read ahead sectors 0 > Block device 253:1 > >And... > >[root at localhost ~]# df -h >Filesystem Size Used Avail Use% Mounted on >/dev/mapper/VolGroup00-LogVol00 > 901G 6.7G 848G 1% / >/dev/sda1 99M 18M 76M 20% /boot >tmpfs 1.9G 0 1.9G 0% /dev/shm >[root at localhost ~]# >yup, its all 1 Volume, you are going to need to shrink the lv's - then >get your volgroup onto /dev/sda only. info on howto do that is in the l>vm howto. also, I'd recommend you download the centos-5.1/livecd and >actually do the work once booted from the livecd. shinking filesystems >requires you to have the filesystem unmounted, so doing it from the >livecd is the only way you are going to manage it here. OK when you say livecd, do you mean the Centos 5.1 distro disks? I have a full set of them, a 7 disk set I got from Linux Central. Can I just boot off disk 1 from my set? ...or, if I left the install the way it is now, are there any dis advantages of leaving the file system the way it is - spread over two hard drives? Should just get another hard drive and back it up the way it is? Would ther be any problems with my backup if left the way it is? Or ahould I just do a complete re install of the OS after backing up my data... What do you reccomend -leave it as is, re configure it, or re install it? _________________________________________________________________ How well do you know your celebrity gossip? http://originals.msn.com/thebigdebate?ocid=T002MSN03N0707A

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md raid1 - no speed improvement
by Kieran Clancy 23 Mar '08

23 Mar '08

Hi, I have two 320 GB SATA disks (/dev/sda, /dev/sdb) in a server running CentOS release 5. They both have three partitions setup as RAID1 using md (boot, swap, and an LVM data partition). # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb1[1] sda1[0] 104320 blocks [2/2] [UU] md1 : active raid1 sdb2[1] sda2[0] 4192896 blocks [2/2] [UU] md2 : active raid1 sdb3[1] sda3[0] 308271168 blocks [2/2] [UU] When I do tests though, I find that the md raid1 read performance is no better than either of the two disks on their own # hdparm -tT /dev/sda3 /dev/sdb3 /dev/md2 /dev/sda3: Timing cached reads: 4160 MB in 2.00 seconds = 2080.92 MB/sec Timing buffered disk reads: 234 MB in 3.02 seconds = 77.37 MB/sec /dev/sdb3: Timing cached reads: 4148 MB in 2.00 seconds = 2074.01 MB/sec Timing buffered disk reads: 236 MB in 3.01 seconds = 78.46 MB/sec /dev/md2: Timing cached reads: 4128 MB in 2.00 seconds = 2064.04 MB/sec Timing buffered disk reads: 230 MB in 3.02 seconds = 76.17 MB/sec If I fail and remove one of the disks in /dev/md2: # mdadm /dev/md2 -f /dev/sda3 # mdadm /dev/md2 -r /dev/sda3 # cat /proc/mdstat ... md2 : active raid1 sdb3[1] 308271168 blocks [2/1] [_U] # hdparm -tT /dev/md2 /dev/md2: Timing cached reads: 4184 MB in 2.00 seconds = 2092.65 MB/sec Timing buffered disk reads: 240 MB in 3.01 seconds = 79.70 MB/sec So with only one disk in the array the performance is pretty much the same. At first I thought maybe the bottleneck is the SATA controller, but if I do simultaneous reads from both disks: # mkfifo /tmp/sync # cat /tmp/sync; hdparm -tT /dev/sda3 (and in another terminal, to make sure they start simultaneously) # > /tmp/sync; hdparm -tT /dev/sdb3 /dev/sda3: Timing cached reads: 2248 MB in 2.00 seconds = 1123.83 MB/sec Timing buffered disk reads: 234 MB in 3.00 seconds = 77.91 MB/sec /dev/sdb3: Timing cached reads: 2248 MB in 2.00 seconds = 1123.74 MB/sec Timing buffered disk reads: 236 MB in 3.01 seconds = 78.30 MB/sec So the total cached read bandwidth seems limited to about 2250 MB/s, which is slightly higher than the cache read bandwidth for /dev/md2, but I'm not too worried about that. More concerning is that I am still getting ~80MB/s from each disk simultaneously on the buffered reads. Given this I would expect /dev/md2 to give buffered read speeds of at least 120MB/s (if not 150MB/s). What can I do to track down this issue? Any help would be really appreciated. Thanks, Kieran Clancy.

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Re: CentOS Digest, Vol 38, Issue 23
by Sam Drinkard 23 Mar '08

23 Mar '08

Ann, Actually I had to add read / execute permissions to the aliases.db to stop the error messages. I'd just like to know what clamav is doing to it or why it needs to read it. I installed the clamav with yum but for some reason it does not know it's in there. How to fix? Sam

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about smbldap tools
by Arwen Smith 22 Mar '08

22 Mar '08

Hello List I'm installing a PDC with ldap using smbldap tools (IDEALX) it's allready configured but when i try to add an user using smbldap-useradd -m user it throw the following error: Error looking for next uid at /opt/IDEALX/sbin//smbldap_tools.pm line 993. can any body help me regard Roilan ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping

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PHP Segfaults on Centos 5 and PBX in a Flash but not Trixbox
by Nigel Kendrick 22 Mar '08

22 Mar '08

Hi Guys, Any known reasons why PHP 5 (Centos 5) might be segfaulting on an Asus A7V8X mobo with an Athlon 2400XP (1GB RAM). Everything else works fine and I had done some system/RAM tests so I am pretty sure the hardware's OK. Here's what I have found: Vanilla CentOS 5 - PHP segfaults yum remove/install PHP on above - PHP segfaults PBX in a Flash iso (based on CentOS5) - PHP segfaults Latest Trixbox (CentOS 5) iso (PHP 5.2.2-3) - OK I wonder if it may be down to compiler or optimisation flags. Any thoughts - Ideally I want to run PBX in a Flash. Thanks Nigel Kendrick

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couple of problems
by Sam Drinkard 22 Mar '08

22 Mar '08

Hello all, I finally got spamass-milter and clamav-milter running, but have one error I've not been able to determine what is happening. From the log entry I see this line: SYSERR(sa-milt): hash map "Alias0": unsafe map file /etc/aliases.db: Permission denied: 39 Time(s) any pointers here? The 2nd item is with yum. I attempted to update, and wound up getting a fail on a dependency, yet the packages (clamav-db & clamd) are in fact installed. How do I use yum to tell it they are in the system? Thanks.. Sam

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Browser window problems (previously discussed) - details?
by MHR 22 Mar '08

22 Mar '08

For those of you who have reported here about problems with your browser windows suddenly going away in Firefox and/or SeaMonkey: Please send me all relevant hardware and software configuration details about your Mozilla installation as well as your version of CentOS. I am looking into a theory about why this might be happening and need more input. You can send these privately directly to me rather than the whole list if you prefer. I only need your h/w and s/w configuration information (what versions you are running on what kind of hardware). Thanks. mhr

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Bootable RHES CD
by Al Sparks 22 Mar '08

22 Mar '08

I am using Sonic Digital Media Plus v7, on Windows, and I'm trying to make a bootable RHEL IA 64 bit CD (mostly so I can include a kickstart file). So what I did is I grabbed the disk one ISO file, copied the contents on my hard drive in a folder. Then I clicked on the Data -> Data Disk. I then clicked on the "Add Data" button and when the "Select files and folders to add" box popped up, I selected all the files and folders and clicked on "Add". The window showed all the files. I then pressed "Make bootable" and selected the file, boot.img in the Images folder. I then burned all this onto a CD-R. I still can't boot off of this CD. Any hints? I've done this with CentOS, a long time ago, but maybe I'm missing something. === Al

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CUPS gone wrong?
by MHR 22 Mar '08

22 Mar '08

Did something change since (at least) CentOS 5.1, kernel 2.6.18-53.1.4 that would affect the CUPS printing system? I am no longer able to connect to it and that seems to be impacting my ability to use the newest unreleased beta version of SeaMonkey. (My standard release SeaMonkey, 1.1.8, works just fine, but I think that using CUPS is new in the 2.0 beta.) Any constructive input appreciated. mhr

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CentOS 5.1 - MySQL 5.0.22 - Courier auth lib problem
by Tom Brown 21 Mar '08

21 Mar '08

Hi I am finishing my mail server config and just trying to get the mysql login working - it fails to connect and thorws the following error Mar 21 21:58:21 mail0 authdaemond: failed to connect to mysql server (server=localhost, userid=courier): Can't connect to local MySQL server through socket '/tmp/mysql.sock.' (2) Mar 21 21:58:21 mail0 couriertcpd: LOGIN FAILED, user=tom(a)xxx.xxx, ip=[::ffff:192.168.10.200] Mar 21 21:58:21 mail0 couriertcpd: authentication error: Input/output error The socket exists # ll /tmp/mysql.sock srwxrwxrwx 1 mysql mysql 0 Mar 21 21:53 /tmp/mysql.sock and mysql seems to be working fine using the same credentials # mysql -S /tmp/mysql.sock -u courier -pxxxxxx Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 7 to server version: 5.0.22 Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> some bits from the my.cnf [client] port = 3306 socket = /tmp/mysql.sock [mysqld] port = 3306 datadir = /var/lib/mysql socket = /tmp/mysql.sock any ideas as i am a bit stumped thanks

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