Hi susers, I have used the linux software raid for some time now, for creating raid0 devices. Yesterday I tried to create a raid1 and a raid5 devices and could not create none of them. when a executed mkraid (with a valid config file) it aborted the execution telling me to look at the syslog ou /proc/mdstat nothing was appearing in syslog. i did a rpmlocate mkraid and found it on two packages, mdutils (tradicional linear, raid0 and raid1 devices) and raidtool (new format, apparently)... reading the docs of the second package, i read that for using this news features one needs some patches to the kernel. i'm using the default 2.2.14 kernel of 6.4, with md driver 0.36 (not unsure about the exact minor version number now) Does this kernel have support for the new raidtool package ? or i'm just doing something wrong ? :) i looked at the support database on sdb.suse.de, but didn't find anything (in english, don't read german yet :) Is there some special instrutions for doing raid1/5 devices with the raidtools package? Thanks in advance, Adilson Ribeiro -- To unsubscribe send e-mail to suse-linux-e-unsubscribe@suse.com For additional commands send e-mail to suse-linux-e-help@suse.com Also check the FAQ at http://www.suse.com/support/faq
On Wed, 20 Sep 2000, Adilson Guilherme Vasconcelos Ribeiro wrote:
Hi susers
~ could someone, please, be so kind, and put in a short sentence, a 'Raid for Dummies' .. . . is the purpose of Raid, to use several Hard Disks, as economically as possible, and, how many disks make Raid worthwhile ? thanks Richard _________ -- ____________ sent on Linux ____________ This Email is 100% Virus Free! How do I know? ~ Because no Microsoft products were used to generate it! -- To unsubscribe send e-mail to suse-linux-e-unsubscribe@suse.com For additional commands send e-mail to suse-linux-e-help@suse.com Also check the FAQ at http://www.suse.com/support/faq
tabanna wrote:
~ could someone, please, be so kind, and put in a short sentence, a 'Raid for Dummies'
.. . . is the purpose of Raid, to use several Hard Disks, as economically as possible, and, how many disks make Raid worthwhile ?
RAID stands for Redundant Array or Inexpensive Disks. There are three main 'flavours' of RAID, numbered 0, 1, and 5. RAID 0 consists of striping only, where half the data is written on one disk, and the other half on the other disk. This offers a performance advantage since the data is written to both drives in parallel and hence takes around half the time. RAID 1 consists of mirroring, where the same data is written to two (identical) drives simultaneously. Although this offers no performance advantage, it does mean that if one disk fails, your data is safe on the other disk. RAID 5 is more complicated in that it uses striping like RAID 0, but also uses a third drive for parity information. This means that if one of the other disks dies, the data can still be reconstructed, and you don't lose any information. In some cases there may only be minimal performance drop when this happens, so if your monitoring software isn't running you may not realise you've lost a disk... This RAID level offers both a performance and a reliability advantage. The striping performed in RAID 0 and 5 doesn't necessarily have to be across two disks - you can stripe across as many disks as you want (within reason). There are other forms of RAID including linear appending and such like, but the above are the most common. Hope that helps, Chris -- __ _ -o)/ / (_)__ __ ____ __ Chris Reeves /\\ /__/ / _ \/ // /\ \/ / ICQ# 22219005 _\_v __/_/_//_/\_,_/ /_/\_\ -- To unsubscribe send e-mail to suse-linux-e-unsubscribe@suse.com For additional commands send e-mail to suse-linux-e-help@suse.com Also check the FAQ at http://www.suse.com/support/faq
participants (3)
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adilson＠rapunza.org -
chris.reeves＠iname.com -
tabanna＠aig.forthnet.gr