Re: question about prblem with raid 1 for freeBSD
On 22/06/2012 10:11, dude golden wrote: > INTEL > 1x Quad-Core i5-2500 3.3GHz, 6M Cache > 16GB DDR3 > 2x 500GB SATAII > then ask from my COLOCATION to install FreeBSD 8.2 or 8.3 with RAID > 1, after many times of fail in installation from colocation they said > that we have problem with RAID 1.we suggest them to play with > different kind of RAID like RAID 5 and they said as our requested > server only have 2 HDD, its not possible to set up RAID 5. Correct. RAID5 requires at least 3 drives. The only way to have resilience against disk failure with just two drives is to use RAID1 (mirroring). How exactly are your colleagues attempting to set up RAID1. There are several different ways of doing it, but these are the most popular: * Using the built-in ATAPI RAID provided by many motherboards * gmirror * ZFS ATAPI RAID is perhaps the least effective, and may require downtime in order to rebuild the system after a disk failure. I suspect this is what is causing your colleagues problems. For setting up a gmirror RAID see this article: http://onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html (That will work fine with 8.2 or older and the old sysinstall; needs to be adapted if using the new bsdinstall with gpart) For setting up a ZFS mirror, see: http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/Mirror or I wrote a similar piece assuming use of bsdinstall: http://www.infracaninophile.co.uk/articles/install-on-zfs/ Both of the gmirror or ZFS procedures involve going beyond what the installer provides and doing at least part of the work from the command line. If that is too scary to contemplate, then try using the PC-BSD installer to install FreeBSD -- it lets you set up mirrors or ZFS from a menu system, and can install plain FreeBSD as well as PC-BSD: http://www.pcbsd.org/index.php?option=com_zoo&view=item&Itemid=98 > now they said us that the only way for having backup of DATA in this > condition is set up a scheduled task to put back up of data in the > second HDD . Well, this is really unsatisfactory and your colleagues should be ashamed. First of all, RAID1 is not *backup*. If you accidentally delete a file, it will be removed from both of the mirrored drives. The thing that RAID1 gets you is resilience to disk failure: one of your drives going 'pop' will not result in the system crashing or any service interruption. Backup of the system should be arranged through some other means: there are many programs available to do the job in the base system or the ports -- personally I like tarsnap, which will backup your data to the cloud (Amazon flavoured cloud, that is) for a very reasonable rate. Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. PGP: http://www.infracaninophile.co.uk/pgpkey signature.asc Description: OpenPGP digital signature
Re: question about prblem with raid 1 for freeBSD
On 6/22/12 11:11 AM, dude golden wrote: > HI there, > > hope my email find you well, i recently order a server with below > configuration > > INTEL > 1x Quad-Core i5-2500 3.3GHz, 6M Cache > 16GB DDR3 > 2x 500GB SATAII > > then ask from my COLOCATION to install FreeBSD 8.2 or 8.3 with RAID 1, after > many times of fail in installation from colocation they said that we have > problem with RAID 1.we suggest them to play with different kind of RAID like > RAID 5 and they said as our requested server only have 2 HDD, its not > possible to set up RAID 5. > > now they said us that the only way for having backup of DATA in this > condition is set up a scheduled task to put back up of data in the second HDD > . > > > > now i really need to know if there is a only way for having data back up in > this condition or you have better idea according to your experience.also if > its the only way , would it be a good level of data security ? > > > looking forward to hear from your side soon. > > Regards, > > Smartelcom Team Hi, Your colleagues are correct about the RAID levels, you can only do RAID5 with a minimum of 3 disks. Your available options with 2 disks are JBOD, RAID0 or RAID1. You obviously want RAID1. How have they tried to install the server ? I've had no problems ever installing 8.2 or 8.3 as a RAID using either gmirror, or hardware RAID. Does the server have a hardware RAID controller or are you trying software RAID ? Do you have remote console access to the server ? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
question about prblem with raid 1 for freeBSD
HI there, hope my email find you well, i recently order a server with below configuration INTEL 1x Quad-Core i5-2500 3.3GHz, 6M Cache 16GB DDR3 2x 500GB SATAII then ask from my COLOCATION to install FreeBSD 8.2 or 8.3 with RAID 1, after many times of fail in installation from colocation they said that we have problem with RAID 1.we suggest them to play with different kind of RAID like RAID 5 and they said as our requested server only have 2 HDD, its not possible to set up RAID 5. now they said us that the only way for having backup of DATA in this condition is set up a scheduled task to put back up of data in the second HDD . now i really need to know if there is a only way for having data back up in this condition or you have better idea according to your experience.also if its the only way , would it be a good level of data security ? looking forward to hear from your side soon. Regards, Smartelcom Team ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
