Am Mittwoch, 9. Mai 2007 schrieb Feizhou: > > HW vs SW RAID: Kind of a religious question. HW has some advantages when > > using RAID-5 or RAID-6 (less CPU load). When using RAID-0 or RAID-1 there > > should not be any difference performance wise. HW RAID gives you some > > advantages in terms of handling, i.e. hotplugging of discs, nice > > administration console, RAID-10 during install ;-), etc. It's up to you > > to decide whether it is worth the money. Plus you need to find a > > controller that is well supported in Linux. > > Hardware raid that comes with bbu write caches normally have a speed > boost in addition to the extra data safety too. Also on RAID-0 and RAID-1? I have only used HW RAID without bbu, so I have no experience with that. However you can tweak your filesystem and disks to do write caching too, especially if you have plenty of RAM. Of course this means living dangerously, so when you need performance and data safety HW RAID with bbu is the only option of course. > > P.p.s. Creating one swap partition on each disc is correct, because > > swapping to RAID-0 is useless. Only if you decide to use RAID-1 for the > > whole disc you should also swap to RAID-1. > > creating one swap partition on each disc is equivalent to swapping to > raid 0...linux automatically strips/spreads swap data to all available > swap areas. Exactly my point. According to the HOWTO swapping to RAID-0 even performs worse IIRC. -- Andreas Micklei IVISTAR Kommunikationssysteme AG Ehrenbergstr. 19 / 10245 Berlin, Germany http://www.ivistar.de Handelsregister: Berlin Charlottenburg HRB 75173 Umsatzsteuer-ID: DE207795030 Vorstand: Dr.-Ing. Dirk Elias Aufsichtsratsvorsitz: Dipl.-Betriebsw. Frank Bindel