Discuss April 2013

discuss@lists.centos.org

168 participants
148 discussions

[XFS] moving internal journal to external hard drive
by aurfalien 14 Apr '13

14 Apr '13

Hi, I've an existing XFS file system which also contains its journal. I would like to create a mirrored set of separate drives to hold an XFS journal. Is it possible to move the internal journal to an external location or must I re create the file system and specify the journal then? - aurf

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vault.centos.org package header problems?
by Bart Schaefer 14 Apr '13

14 Apr '13

http://vault.centos.org/4.9/updates/i386/RPMS/samba-3.0.33-3.36.el4.i386.rpm: [Errno -1] Header is not complete. http://vault.centos.org/4.9/updates/i386/RPMS/rpm-4.3.3-36_nonptl.el4.i386.…: [Errno -1] Header is not complete. http://vault.centos.org/4.9/updates/i386/RPMS/tzdata-2012b-3.el4.noarch.rpm: [Errno -1] Header is not complete. I seem to get this from every package. Am I doing something wrong on my end (other than that I have an old system to maintain)?

1 0

Re: [CentOS] rsync - why not copying all files?
by Robert Moskowitz 14 Apr '13

14 Apr '13

On 04/14/2013 10:28 AM, Reindl Harald wrote: > > Am 14.04.2013 16:17, schrieb Robert Moskowitz: >> I am doing a new setup, got most of the files in place from other places >> and then ran my rsync backup from the command line before putting it in >> crontab. Here is the rsync: >> >> rsync -ah --stats --delete /home/ /mnt/sdc1/backups/homebase/home >> >> Why would files transferred be less than the number of files? For >> example, is there some option I need to move hidden files? I do not >> believe there are any symlinks under /home > because there may be links and special files in userhomes? thanks Harald. > > "--force --delete-after --devices --specials --sparse -tPrlHpogEAX" > are the params to go if you REALLY want to sync folders 1:1 and i > am using this since many years for any backup/sync job local as > also over networks > > # -z compress > # -t timestamps > # -P progress > # -r recursive > # -l links > # -H hard-links > # -p permissions > # -o owner > # -g group > # -E executability > # -A acls > # -X xtended attributes >

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rsync - why not copying all files?
by Robert Moskowitz 14 Apr '13

14 Apr '13

I am doing a new setup, got most of the files in place from other places and then ran my rsync backup from the command line before putting it in crontab. Here is the rsync: rsync -ah --stats --delete /home/ /mnt/sdc1/backups/homebase/home Note that the directory ..../homebase/home did not exist prior to this command; it created it. So here are the stats: Number of files: 6190 Number of files transferred: 5944 Total file size: 4.25G bytes Total transferred file size: 4.25G bytes Literal data: 4.25G bytes Matched data: 0 bytes File list size: 263.95K File list generation time: 0.001 seconds File list transfer time: 0.000 seconds Total bytes sent: 4.25G Total bytes received: 113.93K sent 4.25G bytes received 113.93K bytes 29.60M bytes/sec total size is 4.25G speedup is 1.00 Why would files transferred be less than the number of files? For example, is there some option I need to move hidden files? I do not believe there are any symlinks under /home. Thanks for any help in puzzling this out. I would be greatly upset if some key file was not being backed up.

1 0

OpenVPN routing question
by Boris Epstein 14 Apr '13

14 Apr '13

Hello all, Let's say I have an OpenVPN (v2) server sitting on a Linux machine with the IP address of, say, 192.168.10.1o. We are talking real address, assigned to a NIC on the machine. Now let us say the OpenVPN server hands out IP's in the 192.168.20.0/24range. And let us say that I want the machines able to reach the VPN server to be able to route to the machines available via the VPN. So, for instance, 192.168.10.5 should be able to ping 192.168.20.6 assuming the latter is one of the VPN clients. So here is my question: is there a VPN setting that would facilitate that? It seems like is is trivial enough to allow the VPN clients to route out through the VPN server - but trying to facilitate the reverse I got stuck. Thanks in advance for any help. Cheers, Boris.

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New Trojan Backdoor Malware Targets Mac OS X And Linux, Steals Passwords And Keystrokes - Forbes
by ken 13 Apr '13

13 Apr '13

First appeared in August of last year. Is there perhaps a newer version of this around? <http://www.forbes.com/sites/anthonykosner/2012/08/31/new-trojan-backdoor-ma…>

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centos 6.3 ipv6 default gateway
by Jaze Lee 13 Apr '13

13 Apr '13

hello, i met a problem in configuratiion of ipv6 gw in my box i install centos 6.3 (64 bit) on my boxs, which have four netcard. i use a straight-through cable to connect centosv0:netcard-2 and centosv1:netcard2 the topology is this: client c(windows xp) <-->centosv0:netcard-3 <--> centosv0:netcard-2 <---> centosv1:netcard-2 <---->centosv1:netcard-2 <---> client d (backtrack r2 32) 1:2:3:4::2/64 1:2:3:4::1/64 1:2:3::4/64 1:2:3::5/64 1:2:3:5::1/64 1:2:3:5::2/64 what i want to do is set default gw on centosv0 to centosv1 i configure /etc/sysconfig/network-scripts/ifconfig-eth2 (centosv0) as this DEVICE="eth2" BOOTPROTO=static HWADDR="60:A4:4C:23:2F:6F" NM_CONTROLLED="yes" ONBOOT="yes" TYPE="Ethernet" #UUID="0ddcf499-878f-4ac7-9d1a-c27f85d2bccf" IPV6INIT=yes IPV6ADDR=1:2:3::4 IPV6_DEFAULTGW=1:2:3::5 and i also configure /etc/sysconfig/network to this: NETWORKING=yes HOSTNAME=centosv0 NETWORKING_IPV6=yes IPV6_AUTOCONF=no but i met an error: Bringing up interface eth2: WARN : [ipv6_add_route] Unknown error i do not know how why,and can some one gives me some suggestion? thanks a lot.

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How to determine why a server is not responding
by nan del bosc 12 Apr '13

12 Apr '13

Hi to all! We're using CentOS 5.5 64bits for our Plesk 11. This week we had the following problem 3 times... Suddenly, the server stops responding in all services (SSH, Apache, Postfix, ...) but ping works! After wait a few minutes (or 2 hours some times) the server continues unresponsive until we reboot. After reboot we search on /var/log/messages but cannot find useful information... Apr 11 14:56:05 s1 postfix/smtpd[8263]: SQL engine 'intentionally disabled' not supported Apr 11 14:56:05 s1 postfix/smtpd[8263]: auxpropfunc error no mechanism available Apr 11 14:56:42 s1 postfix/smtpd[8370]: SQL engine 'intentionally disabled' not supported Apr 11 14:56:42 s1 postfix/smtpd[8370]: auxpropfunc error no mechanism available Apr 11 14:56:47 s1 postfix/smtpd[8391]: SQL engine 'intentionally disabled' not supported Apr 11 14:56:47 s1 postfix/smtpd[8391]: auxpropfunc error no mechanism available Apr 11 14:56:47 s1 postfix/smtpd[8392]: SQL engine 'intentionally disabled' not supported Apr 11 14:56:47 s1 postfix/smtpd[8392]: auxpropfunc error no mechanism available Apr 11 16:55:42 s1 syslogd 1.4.1: restart. Apr 11 16:55:42 s1 kernel: klogd 1.4.1, log source = /proc/kmsg started. Apr 11 16:55:42 s1 kernel: Bootdata ok (command line is ro root=/dev/xvda1 console=xvc0 console=hvc0 xencons=hvc) Apr 11 16:55:42 s1 kernel: Linux version 2.6.18-194.26.1.el5xen ( mockbuild(a)builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Nov 9 13:35:30 EST 2010 Apr 11 16:55:42 s1 kernel: BIOS-provided physical RAM map: Apr 11 16:55:42 s1 kernel: Xen: 0000000000000000 - 0000000080000000 (usable) Apr 11 16:55:42 s1 kernel: No mptable found. Apr 11 16:55:42 s1 kernel: Built 1 zonelists. Total pages: 524288 Apr 11 16:55:42 s1 kernel: Kernel command line: ro root=/dev/xvda1 console=xvc0 console=hvc0 xencons=hvc Apr 11 16:55:42 s1 kernel: Initializing CPU#0 Apr 11 16:55:42 s1 kernel: PID hash table entries: 4096 (order: 12, 32768 bytes) Apr 11 16:55:42 s1 kernel: Xen reported: 2009.260 MHz processor. Apr 11 16:55:42 s1 kernel: Console: colour dummy device 80x25 Apr 11 16:55:42 s1 kernel: Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes) Apr 11 16:55:42 s1 kernel: Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes) Apr 11 16:55:42 s1 kernel: Software IO TLB disabled Apr 11 16:55:42 s1 kernel: Memory: 2043384k/2097152k available (2513k kernel code, 53108k reserved, 1395k data, 184k init) Apr 11 16:55:42 s1 kernel: Calibrating delay using timer specific routine.. 5025.13 BogoMIPS (lpj=10050261) Apr 11 16:55:42 s1 kernel: Security Framework v1.0.0 initialized Apr 11 16:55:42 s1 kernel: SELinux: Initializing. Apr 11 16:55:42 s1 kernel: selinux_register_security: Registering secondary module capability Apr 11 16:55:42 s1 kernel: Capability LSM initialized as secondary Apr 11 16:55:42 s1 kernel: Mount-cache hash table entries: 256 Apr 11 16:55:42 s1 kernel: CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line) Apr 11 16:55:42 s1 kernel: CPU: L2 Cache: 512K (64 bytes/line) Apr 11 16:55:42 s1 kernel: CPU: Physical Processor ID: 0 Apr 11 16:55:42 s1 kernel: CPU: Processor Core ID: 0 Apr 11 16:55:42 s1 kernel: (SMP-)alternatives turned off Apr 11 16:55:42 s1 kernel: Brought up 1 CPUs Apr 11 16:55:42 s1 kernel: checking if image is initramfs... it is Apr 11 16:55:42 s1 kernel: Grant table initialized Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 16 Apr 11 16:55:42 s1 kernel: Brought up 1 CPUs Apr 11 16:55:42 s1 kernel: PCI: setting up Xen PCI frontend stub Apr 11 16:55:42 s1 kernel: ACPI: Interpreter disabled. Apr 11 16:55:42 s1 kernel: Linux Plug and Play Support v0.97 (c) Adam Belay Apr 11 16:55:42 s1 kernel: pnp: PnP ACPI: disabled Apr 11 16:55:42 s1 kernel: xen_mem: Initialising balloon driver. Apr 11 16:55:42 s1 kernel: usbcore: registered new driver usbfs Apr 11 16:55:42 s1 kernel: usbcore: registered new driver hub Apr 11 16:55:42 s1 kernel: PCI: System does not support PCI Apr 11 16:55:42 s1 kernel: PCI: System does not support PCI Apr 11 16:55:42 s1 kernel: NetLabel: Initializing Apr 11 16:55:42 s1 kernel: NetLabel: domain hash size = 128 Apr 11 16:55:42 s1 kernel: NetLabel: protocols = UNLABELED CIPSOv4 Apr 11 16:55:42 s1 kernel: NetLabel: unlabeled traffic allowed by default Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 2 Apr 11 16:55:42 s1 kernel: IP route cache hash table entries: 65536 (order: 7, 524288 bytes) Apr 11 16:55:42 s1 kernel: TCP established hash table entries: 262144 (order: 10, 4194304 bytes) Apr 11 16:55:42 s1 kernel: TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) Apr 11 16:55:42 s1 kernel: TCP: Hash tables configured (established 262144 bind 65536) Apr 11 16:55:42 s1 kernel: TCP reno registered Apr 11 16:55:42 s1 kernel: audit: initializing netlink socket (disabled) Apr 11 16:55:42 s1 kernel: type=2000 audit(1365692095.507:1): initialized Apr 11 16:55:42 s1 kernel: VFS: Disk quotas dquot_6.5.1 Apr 11 16:55:42 s1 kernel: Dquot-cache hash table entries: 512 (order 0, 4096 bytes) Apr 11 16:55:42 s1 kernel: Initializing Cryptographic API Apr 11 16:55:42 s1 kernel: alg: No test for crc32c (crc32c-generic) Apr 11 16:55:42 s1 kernel: ksign: Installing public key data Apr 11 16:55:42 s1 kernel: Loading keyring Apr 11 16:55:42 s1 kernel: - Added public key 12AFE3EA6A14161C Apr 11 16:55:42 s1 kernel: - User ID: CentOS (Kernel Module GPG key) Apr 11 16:55:42 s1 kernel: io scheduler noop registered Apr 11 16:55:42 s1 kernel: io scheduler anticipatory registered Apr 11 16:55:42 s1 kernel: io scheduler deadline registered Apr 11 16:55:42 s1 kernel: io scheduler cfq registered (default) Apr 11 16:55:42 s1 kernel: pci_hotplug: PCI Hot Plug PCI Core version: 0.5 Apr 11 16:55:42 s1 kernel: rtc: IRQ 8 is not free. Apr 11 16:55:42 s1 kernel: Non-volatile memory driver v1.2 Apr 11 16:55:42 s1 kernel: Linux agpgart interface v0.101 (c) Dave Jones Apr 11 16:55:42 s1 kernel: brd: module loaded Apr 11 16:55:42 s1 kernel: Xen virtual console successfully installed as xvc0 Apr 11 16:55:42 s1 kernel: Event-channel device installed. Apr 11 16:55:42 s1 kernel: Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 Apr 11 16:55:42 s1 kernel: ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx Apr 11 16:55:42 s1 kernel: ide-floppy driver 0.99.newide Apr 11 16:55:42 s1 kernel: usbcore: registered new driver hiddev Apr 11 16:55:42 s1 kernel: usbcore: registered new driver usbhid Apr 11 16:55:42 s1 kernel: drivers/usb/input/hid-core.c: v2.6:USB HID core driver Apr 11 16:55:42 s1 kernel: PNP: No PS/2 controller found. Probing ports directly. Apr 11 16:55:42 s1 kernel: i8042.c: No controller found. Apr 11 16:55:42 s1 kernel: mice: PS/2 mouse device common for all mice Apr 11 16:55:42 s1 kernel: md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27 Apr 11 16:55:42 s1 kernel: md: bitmap version 4.39 Apr 11 16:55:42 s1 kernel: TCP bic registered Apr 11 16:55:42 s1 kernel: Initializing IPsec netlink socket Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 1 Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 17 Apr 11 16:55:42 s1 kernel: XENBUS: Device with no driver: device/vbd/51712 Apr 11 16:55:42 s1 kernel: XENBUS: Device with no driver: device/vif/0 Apr 11 16:55:42 s1 kernel: Initalizing network drop monitor service Apr 11 16:55:42 s1 kernel: Write protecting the kernel read-only data: 483k Apr 11 16:55:42 s1 kernel: USB Universal Host Controller Interface driver v3.0 Apr 11 16:55:42 s1 kernel: Fusion MPT base driver 3.04.13rh Apr 11 16:55:42 s1 kernel: Copyright (c) 1999-2008 LSI Corporation Apr 11 16:55:42 s1 kernel: SCSI subsystem initialized Apr 11 16:55:42 s1 kernel: Fusion MPT SPI Host driver 3.04.13rh Apr 11 16:55:42 s1 kernel: device-mapper: uevent: version 1.0.3 Apr 11 16:55:42 s1 kernel: device-mapper: ioctl: 4.11.5-ioctl (2007-12-12) initialised: dm-devel(a)redhat.com Apr 11 16:55:42 s1 kernel: device-mapper: dm-raid45: initialized v0.2594l Apr 11 16:55:42 s1 kernel: SGI XFS with ACLs, security attributes, large block/inode numbers, no debug enabled Apr 11 16:55:42 s1 kernel: SGI XFS Quota Management subsystem Apr 11 16:55:42 s1 kernel: Registering block device major 202 Apr 11 16:55:42 s1 kernel: xvda: xvda1 xvda2 xvda3 Apr 11 16:55:42 s1 kernel: netfront: Initialising virtual ethernet driver. Apr 11 16:55:42 s1 kernel: netfront: device eth0 has copying receive path. Apr 11 16:55:42 s1 kernel: EXT3-fs: INFO: recovery required on readonly filesystem. Apr 11 16:55:42 s1 kernel: EXT3-fs: write access will be enabled during recovery. Apr 11 16:55:42 s1 kernel: kjournald starting. Commit interval 5 seconds Apr 11 16:55:42 s1 kernel: EXT3-fs: recovery complete. Apr 11 16:55:42 s1 kernel: EXT3-fs: mounted filesystem with ordered data mode. Apr 11 16:55:42 s1 kernel: SELinux: Disabled at runtime. Apr 11 16:55:42 s1 kernel: type=1404 audit(1365692123.036:2): selinux=0 auid=4294967295 ses=4294967295 Apr 11 16:55:42 s1 kernel: input: PC Speaker as /class/input/input0 Apr 11 16:55:42 s1 kernel: Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is unknown type 15 (usb?) Apr 11 16:55:42 s1 kernel: Failed to obtain physical IRQ 6 Apr 11 16:55:42 s1 kernel: floppy0: no floppy controllers found Apr 11 16:55:42 s1 kernel: lp: driver loaded but no devices found Apr 11 16:55:42 s1 kernel: md: Autodetecting RAID arrays. Apr 11 16:55:42 s1 kernel: md: autorun ... Apr 11 16:55:42 s1 kernel: md: ... autorun DONE. Apr 11 16:55:42 s1 kernel: device-mapper: multipath: version 1.0.5 loaded Apr 11 16:55:42 s1 kernel: EXT3 FS on xvda1, internal journal Apr 11 16:55:42 s1 kernel: Filesystem "dm-0": Disabling barriers, trial barrier write failed Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-0 Apr 11 16:55:42 s1 kernel: Starting XFS recovery on filesystem: dm-0 (logdev: internal) Apr 11 16:55:42 s1 kernel: Ending XFS recovery on filesystem: dm-0 (logdev: internal) Apr 11 16:55:42 s1 kernel: Filesystem "dm-1": Disabling barriers, trial barrier write failed Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-1 Apr 11 16:55:42 s1 kernel: Starting XFS recovery on filesystem: dm-1 (logdev: internal) Apr 11 16:55:42 s1 kernel: Ending XFS recovery on filesystem: dm-1 (logdev: internal) Apr 11 16:55:42 s1 kernel: Filesystem "dm-2": Disabling barriers, trial barrier write failed Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-2 Apr 11 16:55:42 s1 kernel: Adding 1959920k swap on /dev/xvda2. Priority:-1 extents:1 across:1959920k Apr 11 16:55:43 s1 kernel: ip_tables: (C) 2000-2006 Netfilter Core Team Apr 11 16:55:43 s1 kernel: Netfilter messages via NETLINK v0.30. Apr 11 16:55:43 s1 kernel: ip_conntrack version 2.4 (8192 buckets, 65536 max) - 304 bytes per conntrack Apr 11 16:55:44 s1 kernel: NET: Registered protocol family 10 Apr 11 16:55:44 s1 kernel: lo: Disabled Privacy Extensions Apr 11 16:55:44 s1 kernel: IPv6 over IPv4 tunneling driver Apr 11 16:55:44 s1 kernel: ip6_tables: (C) 2000-2006 Netfilter Core Team Apr 11 16:55:46 s1 xinetd[1426]: xinetd Version 2.3.14 started with libwrap loadavg labeled-networking options compiled in. Apr 11 16:55:46 s1 xinetd[1426]: Started working: 2 available services What can we do? what can we test? More information... Kernel: Linux 2.6.18-194.26.1.el5xen #1 SMP Tue Nov 9 13:35:30 EST 2010 x86_64 x86_64 x86_64 GNU/Linux RAM (in MB): total used free shared buffers cached Mem: 2048 1662 385 0 13 506 -/+ buffers/cache: 1142 905 Swap: 1913 0 1913 Disc usage: S. fitxers Mida En ús Lliure %Ús Muntat en /dev/xvda1 3.7G 1.9G 1.8G 52% / /dev/mapper/vg00-usr 13G 1.4G 12G 11% /usr /dev/mapper/vg00-var 66G 22G 45G 33% /var /dev/mapper/vg00-home 4.0G 4.2M 4.0G 1% /home none 1.0G 0 1.0G 0% /tmp CPU: processor : 0 vendor_id : AuthenticAMD cpu family : 16 model : 8 model name : Six-Core AMD Opteron(tm) Processor 2423 HE stepping : 0 cpu MHz : 2009.260 cache size : 512 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu de tsc msr pae cx8 apic cmov pat clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow constant_tsc pni cx16 popcnt lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse bogomips : 5025.13 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc [6] [7] [8] Thank's! -- --- Salut!

9 12

xfsaild causing load, and stuck in D state - Centos 6.4 x64
by Svavar Örn Eysteinsson 12 Apr '13

12 Apr '13

PowerEdge 2850 with PERC SCSI RAID controller. 16GB RAM Dual Intel(R) Xeon(TM) CPU 3.00GHz Using megaraid driver and xfs on 3x 300GB SCSI disks as /dev/sdb (total 572GB) (RAID-5) Stock Centos 6.4 x64, everything updated. Kernel : 2.6.32-358.2.1.el6.x86_64 #1 SMP My Load always shows : top - 10:30:21 up 23:09, 1 users, load average: 0.99, 0.96, 0.79 yet there is no services what-so-ever doing anything. Using PowerTOP I can see that xfsaild is causing second most wake-ups (after kernel core : hrtimer_start (tick_sched_timer) ) < Detailed C-state information is not P-states (frequencies) 3.00 Ghz 100.0% 1500 Mhz 0.0% 1125 Mhz 0.0% 750 Mhz 0.0% 375 Mhz 0.0% Wakeups-from-idle per second : 125.1 interval: 10.0s no ACPI power usage estimate available Top causes for wake-ups: 47.7% (119.6) <kernel core> : hrtimer_start (tick_sched_timer) 39.9% (100.0) xfsaild/sdb1 : xfsaild (process_timeout) Again, using TOP I can see that xfsaild is stuck in D state. It never changes. 10050 root 20 0 0 0 0 D 0.0 0.0 0:01.17 xfsaild/sdb1 My only way to fix this, is either rebooting the machine, unmounting the volume and mounting it back online. I've been rsyncing data twice between this server and another one. The rsync process takes about 30m-1hour. After the rsync operation I see that the xfsaild is stuck in D State and my Load is near 1.00. I'v had no problem what-so-ever on centos 6.3 or early versions on other servers. Any thoughts ? Information, help would be much appreciated. Thanks in advance. Best regards, Svavar

3 5

Re: [CentOS] RAID 6 - opinions
by Seth Bardash 12 Apr '13

12 Apr '13

We build a storage unit that anyone using Centos can build. It is based on the 3ware 9750-16 controller. It has 16 x 2 TB Sata 6 gb/s disks. We always set it up as a 15 disk RAID 6 array and a hot spare. We have seen multiple instances were the A/C has gone off but the customer's UPS kept the systems running for an hour or two with no cooling. Once the ambient temperature goes above 40C you are stressing all the disks in the array. I ramble about this BECAUSE we have seen many RAID 5 arrays fail while rebuilding with a hot spare and then loose all the data. The chances of this happening on a R6 array are much much lower. Now for performance numbers: 550 MB/SEC on writes and 1150 MB/SEC on reads. A unit like this can support any type of I/O you want to put into it as Centos will usually either have thedrivers built in or you can add then easily. Also the rebuild time for a 50 TB array is about 12 hours while the array is in use and online. But during this time there is little or no degradation in performance. The down side is the cost of the controller. If anyone has questions about this I would be glad to answer them off line : at seth at integratedsolutions dot org. Adrian Sevcenco <Adrian.Sevcenco(a)cern.ch> wrote: >On 04/11/2013 06:36 PM, m.roth(a)5-cent.us wrote: >> I'm setting up this huge RAID 6 box. I've always thought of hot spares, >> but I'm reading things that are comparing RAID 5 with a hot spare to RAID >> 6, implying that the latter doesn't need one. I *certainly* have enough >> drives to spare in this RAID box: 42 of 'em, so two questions: should I >we use several of this kind of boxes (but with 45 trays) and our >experience was that the optimum volume size was 12 hdds (3 X 12 + 9) >which will reduce the 45 disks to a actual size of 37 disks (a 12 disk >volume is 40 TB size ... in event of a broken hdd it takes 1 day to >recover.. more than 12 disks and i dont (want to) know how long it would >take) and we don't use hot spares. > >HTH, >Adrian > > >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos

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