Discuss December 2007

discuss@lists.centos.org

279 participants
374 discussions

Filesystem that doesn't store duplicate data
by rsivak＠istandfor.com 06 Dec '07

06 Dec '07

Is there such a filesystem available? It seems like it wouldn't be too hard to implement... Basically do things on a block by block basis. Store md5 of a block in the table, and when writing a new block, check if the md5 already exists and then point the new block to the old block. Since md5 is not guaranteed unique, might need to do a diff between the 2 blocks and if the blocks are indeed different, handle it somehow. When modifying an existing block that has multiple pointers, copy the block and modify the new block. I know I'm oversimplifying things a lot, but something like this could work, no? Would be a great filesystem to store backups on, or things like vmware volumes... Russ Sent from my Verizon Wireless BlackBerry

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MP3 encoding with Sound-Juicer
by Olaf Mueller 06 Dec '07

06 Dec '07

Hello, what do I need to encode mp3 with Sound Juicer under CentOS 5.1? Thank you Olaf

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LVM2: large volume problem?
by Antonio da Silva Martins Junior 06 Dec '07

06 Dec '07

Hi all, I'm having problems to create/resize an lv up to 1T (well I can't reach 300G), my system is a CentOS 5.1 x86_64 on a Dell 2950 with 6x500G SATA (RAID5 to aprox. 2.5T) [root@Mugello ~]# fdisk -l Disk /dev/sda: 2497.7 GB, 2497791918080 bytes 255 heads, 63 sectors/track, 303672 cylinders Units = cilindros of 16065 * 512 = 8225280 bytes Dispositivo Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 36323 291657269+ 8e Linux LVM [root@Mugello ~]# vgdisplay --- Volume group --- VG Name sys System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 26 VG Access read/write VG Status resizable MAX LV 0 Cur LV 4 Open LV 4 Max PV 0 Cur PV 1 Act PV 1 VG Size 2,27 TB PE Size 32,00 MB Total PE 74436 Alloc PE / Size 512 / 16,00 GB Free PE / Size 73924 / 2,26 TB VG UUID yuxYGR-dLVP-DuXz-i4oP-14ep-aYWQ-xBp6f1 [root@Mugello ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% root sys -wi-ao 4,00G swap sys -wi-ao 2,00G usr sys -wi-ao 5,00G var sys -wi-ao 5,00G When I try to create a 1T lv it gives me this error: [root@Mugello ~]# lvcreate -L1T -nstor sys device-mapper: reload ioctl failed: Argumento inválido Failed to activate new LV. and on /var/log/messages I had this: Dec 6 08:31:27 Mugello kernel: device-mapper: table: device 8:2 too small for target Dec 6 08:31:27 Mugello kernel: device-mapper: table: 253:4: linear: dm-linear: Device lookup failed Dec 6 08:31:27 Mugello kernel: device-mapper: ioctl: error adding target to table the lv is created: [root@Mugello ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% root sys -wi-ao 4,00G stor sys -wi-d- 1,00T swap sys -wi-ao 2,00G usr sys -wi-ao 5,00G var sys -wi-ao 5,00G but is unusable: [root@Mugello ~]# mkfs -t ext3 /dev/sys/stor mke2fs 1.39 (29-May-2006) Could not stat /dev/sys/stor --- Arquivo ou diretório não encontrado The device apparently does not exist; did you specify it correctly? [root@Mugello ~]# ls -la /dev/mapper/ total 0 drwxr-xr-x 2 root root 160 Dez 6 09:02 . drwxr-xr-x 12 root root 4220 Dez 6 07:43 .. crw------- 1 root root 10, 63 Dez 6 07:43 control brw-rw---- 1 root disk 253, 0 Dez 6 07:43 sys-root brw-rw---- 1 root disk 253, 4 Dez 6 09:02 sys-stor brw-rw---- 1 root disk 253, 3 Dez 6 07:43 sys-swap brw-rw---- 1 root disk 253, 1 Dez 6 07:43 sys-usr brw-rw---- 1 root disk 253, 2 Dez 6 07:43 sys-var [root@Mugello ~]# mkfs -t ext3 /dev/mapper/sys-stor mke2fs 1.39 (29-May-2006) mkfs.ext3: Device size reported to be zero. Invalid partition specified, or partition table wasn't reread after running fdisk, due to a modified partition being busy and in use. You may need to reboot to re-read your partition table. If I try with a small size (less than 300G) it works well: [root@Mugello ~]# lvcreate -L100G -nstor sys Logical volume "stor" created [root@Mugello ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% root sys -wi-ao 4,00G stor sys -wi-a- 100,00G swap sys -wi-ao 2,00G usr sys -wi-ao 5,00G var sys -wi-ao 5,00G What can I try to do to create an lv with 1T?? Thanks in advance, Antonio. -- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Antonio S. Martins Jr. - Support Analist | "Only The Shadow Knows | | Universidade Estadual de Maringá - Brasil| what evil lurks in the | | NPD - Núcleo de Processamento de Dados | Heart of Men!" | | E-Mail: asmartins(a)uem.br / shadow(a)uem.br | !!! Linux User: 52392 !!! | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -- Esta mensagem foi verificada pelo sistema de antiv�rus e acredita-se estar livre de perigo.

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RE: [CentOS] Announcing the CentOS on Laptops initiative
by Trevor Benson 06 Dec '07

06 Dec '07

> Sadly, for now, you have to request access to be allowed to create or > edit > these pages. I hope in the future we will have a more liberal view wrt. > the wiki. > > PS I created this structure for your X60 for now, I plan to add my own > laptops soon (but it does not include a X60). If you can add your > information to this existing page, I am sure this is very valuable for > another X60 owner. Can I get a Thinkpad R51 page setup if not already and access. About to blow out the FC6 and load CentOS 5 since I have to finagle the wifi every so often. Figured document as I go lest I forget. Trevor

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Arp problems I think ...
by Alan Bunch 06 Dec '07

06 Dec '07

Please bear with me as I know I have included a lot of detail. Description Redhat AS 3 Kernel 2.4.21-47.0.1.ELsmp eth0 HWaddr 00:07:E9:11:30:76 inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0 eth0:1 HWaddr 00:07:E9:11:30:76 inet addr:192.168.3.1 Bcast:192.168.3.255 Mask:255.255.255.0 This interface is up but with no IP address eth1 HWaddr 00:07:E9:11:30:77 eth1.101 10.10.1.1 Bcast:10.10.1.255 Mask:255.255.255.0 vlan 101 eth1.102 10.10.2.1 Bcast:10.10.2.255 Mask:255.255.255.0 vlan 102 eth1.103 10.10.3.1 Bcast:10.10.3.255 Mask:255.255.255.0 vlan 103 eth1.104 10.10.4.1 Bcast:10.10.4.255 Mask:255.255.255.0 vlan 104 eth1.105 10.10.5.1 Bcast:10.10.5.255 Mask:255.255.255.0 vlan 105 eth1.106 10.10.6.1 Bcast:10.10.6.255 Mask:255.255.255.0 vlan 106 eth1.107 10.10.7.1 Bcast:10.10.7.255 Mask:255.255.255.0 vlan 107 eth1.108 10.10.8.1 Bcast:10.10.8.255 Mask:255.255.255.0 vlan 108 eth1.109 10.10.9.1 Bcast:10.10.9.255 Mask:255.255.255.0 vlan 109 eth2 Link encap:Ethernet HWaddr 00:06:5B:FE:56:C2 BROADCAST MULTICAST MTU:1500 Metric:1 eth3 Link encap:Ethernet HWaddr 00:06:5B:FE:56:C3 BROADCAST MULTICAST MTU:1500 Metric:1 This machine is routing between the vlans. When I ping 10.10.5.105 I get Host Unreachable. Here is tcpdump from the ping on the router. tcpdump -i eth1.105 14:10:28.254008 arp who-has 10.10.5.105 tell 10.10.5.1 14:10:29.250067 arp who-has 10.10.5.105 tell 10.10.5.1 14:10:30.250143 arp who-has 10.10.5.105 tell 10.10.5.1 Ok now I go to the device via a serial port and ping back to 10.10.5.1 ( the router ) and here is the tcpdump output tcpdump -i eth1.105 -n tcpdump: listening on eth1.105 14:12:06.706722 arp who-has 10.10.5.1 tell 10.10.5.105 14:12:06.706798 arp reply 10.10.5.1 is-at 0:7:e9:11:30:77 14:12:06.707715 10.10.5.105 > 10.10.5.1: icmp: echo request (DF) 14:12:06.707762 10.10.5.1 > 10.10.5.105: icmp: echo reply 14:12:07.723100 10.10.5.105 > 10.10.5.1: icmp: echo request (DF) 14:12:07.723136 10.10.5.1 > 10.10.5.105: icmp: echo reply Now of course I can ping 10.10.5.10 (the suspect device) from 10.10.5.1 ( the router ) ping 10.10.5.1 PING 10.10.5.1 (10.10.5.1) 56(84) bytes of data. 64 bytes from 10.10.5.1: icmp_seq=0 ttl=64 time=0.068 ms 64 bytes from 10.10.5.1: icmp_seq=1 ttl=64 time=0.039 ms This is fine untill the arp entry ages out. Then I back to not being able to ping the device. If I manually insert an arp table entry all is well. No filtering in the switches. Switches are SMC 6826 for the 10/100 and 8724 for the core and gig e. I have several similar symptoms like this in various places. I have some devices on vlans that I see the dhcp discover messages and I see the dhcp offer then the device sends another dhcp discover. This goes on for a few times and the device just waits and starts the process over. I feel that the problem lies in the handling of arp requests but I guess I just don't know enough about how linux handles them or how to control them to find a solution. Any ideas ? Alan

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Network performance
by Vitaly 06 Dec '07

06 Dec '07

I'm running RHEL/CentOS 3 (2.4.21-47.ELsmp) with Broadcom NIC and BASP bonding (bcm5700 v8.1.55) When network traffic is ~12MB/sec (== ~120K packets/sec) CPU system load is growing up to 50-60%%. Yes, I know, that small packets (~100 bytes/packet) are not optimal for network throughput, but in the short-middle term I cannot re-write our application. Are there any network driver / kernel parameters which can help me to increase network throughput? Replacing bcm5700 to tg3? Upgrading to RHEL 4 or 5 with kernel 2.6? Other ideas? Thanks, Vitaly

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Need a sendmail help mail list
by Robert Moskowitz 06 Dec '07

06 Dec '07

I have a sendmail question. Can someone point me to a list appropriate to get some sendmail.mc help?

5 13

5.x install - loses display when launching anaconda
by Tom Lanyon 06 Dec '07

06 Dec '07

Hi all, Trying to install 5.0 or 5.1 (i386 or x86_64) on a new system from an install DVD. As soon as the installer launches anaconda, the screen shuts off and from this point I'm unable to switch to any other tty. This is an Intel core2duo machine on an Intel P35 chipset motherboard, Geforce 8400GS video card connected to a BenQ 20" widescreen LCD. Any ideas what could cause this behaviour or how to debug further (obviously I can't see any error messages as my virtual consoles are no loner available)? I think I'll try installing via a serial console when I get home and see if I have more success. Regards, Tom

3 4

Re: [CentOS] Replacement for Linux-HA (heartbeat) - RedHat cluster?
by Amos Shapira 06 Dec '07

06 Dec '07

On 06/12/2007, Dave Augustus <davea@kcm40202> wrote: > If you can try with non-Xen kernels, you should get better results. Does this mean that you tried Xen kernels and DomU and it failed, then switched to non-Xen kernels on the same setup and it succeeded? Thanks, --Amos

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Re: [CentOS] Need a sendmail help mail list
by Robert Moskowitz 06 Dec '07

06 Dec '07

replies-lists-a1z2-centos(a)listmail.innovate.net wrote: > do you have "fax.foo.com" in /etc/mail/local-host-names ? if not that > name won't be seen as local and sendmail on 192.168.1.100 will try to > relay mail to that fqdn (that's directed to it due the the dns entry). > welll,,,,,, fax.foo.com is. But 222.fax.foo.com is not. Nor is sales.fax.foo.com or 2342.fax.foo.com, etc. the design here is that the fax server will dial an extension and on the header page indicate the fax is for user (user(a)ext.fax.foo.com) This is what all the documentation points to. The arg for faxmail is: -d user@ext > - Rick > > > ------------ Original Message ------------ > >> Date: Wednesday, December 05, 2007 10:44:58 PM -0500 >> From: Robert Moskowitz <rgm(a)htt-consult.com> >> To: CentOS mailing list <centos(a)centos.org> >> Subject: Re: [CentOS] Need a sendmail help mail list >> >> Craig White wrote: >> >>> On Wed, 2007-12-05 at 21:44 -0500, Robert Moskowitz wrote: >>> >>> >>>> I have a sendmail question. >>>> >>>> Can someone point me to a list appropriate to get some >>>> sendmail.mc help? >>>> >>>> >>> ---- >>> try here first >>> >> My fax server (fax.foo.com) is suppose to receive mail to: >> user(a)ext.fax.foo.com and execute: >> >> /usr/bin/faxmail -d user@ext >> >> I found the following items to add to sendmail.mc: >> >> define(`FAX_MAILER_PATH',`/usr/bin/faxmail')dnl >> define(`FAX_MAILER_ARGS',`faxmail -d -n -p 12pt $u@$h $f')dnl >> MAILER(`fax')dnl >> >> >> I have set up DNS with a pseudo domain: >> >> sip.foo.com. IN A 192.168.1.100 >> fax.foo.com. IN A 192.168.1.100 >> *.fax.foo.com. IN MX 10 fax.foo.com >> >> >> >> nslookup shows this to work, and in fact my POP mail server does >> try to send mail addessed: >> >> to: joe(a)222.fax.foo.com >> >> To fax.foo.com, that gets sent back to me with the error >> information: >> >> >> ----- The following addresses had permanent fatal errors ----- >> <joe(a)222.fax.foo.com> >> >> ----- Transcript of session follows ----- >> 554 5.0.0 MX list for 222.fax.foo.com. points back to sip.foo.com >> 554 5.3.5 Local configuration error >> >> sendmail is NOT suppose to try to relay; it is suppose to accept >> this for local delivery, and not do a DNS lookup on >> 222.fax.foo.com.... >> >> So obviously I need more sendmail help. Then I will have to set it >> up via webmin.... >> >> >> It is interesting that when you ask this question directly on the >> Hylafax mail list, either no one answers, or point you to URLs that >> give partial answers. >> >> >> I know that DNS can act strange with 2 A records to the same >> address. That is what CNAME is suppose to be for. Now that I see >> that I am not expecting email to sip.foo.com, I could make that the >> cname. Of course the host name is sip.foo.com with fax a service >> on it.... >> >> > ---------- End Original Message ---------- > > >

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Discuss December 2007