Jim Flanagan wrote: > James Knott wrote: >> jdd wrote: >> >>> James Knott wrote: >>> >>> >>>> however disk drives are >>>> mechanical devices and thus more likely to fail. >>>> >>> I have had at least as many ram failure than hard drive >>> >>> with swap, you are vulnerable to both together... >>> >>> jdd >>> >>> >>> >> The only computer I have with RAID also has error correcting memory, as >> many servers use. Also, back in the days when I was a computer tech, >> servicing mini-computers, hard drive failures were far more frequent >> than memory. >> >> > Thanks for the great discussion on this! In my case I'm running a home > server, that can be taken down for short periods of time when needed. > I'm more interested in maintaining my setup and data, so I set up a > raid1 to give me some redundancy here. That way if a disk encounters a > problem between backups, I have some built in protection. I usually do > a full backup every week, sometimes two, but not more than that. I > don't have to have a failsafe setup here, but would like to not loose > data. > > The reason I set up swap (and /boot, /, and /home) on raid was I was > following the article about software raid on the opensuse wiki. That > article indicated, and others I've read stated that in order to > recover one lost disk with the other, ALL partitions on the disk had > to be mirrored (not just /home for example). Is this true? > > I re-booted with the "noresume" option and can access swap now on the > mirrored /dev/md1 so that's not an issue now, and I'm comfortable > leaving swap mirrored on /dev/md1, but is that necessary or > recommended? For performance sake I could make swap not raid, but what > does that do to my recovery situation in the future if needed? > > There is a lot of discussion regarding raid, and one thing I've > learned is that there are many different implementations. Raid is not > raid is not raid. It may be that the recovery issue related to the > full disk being mirrored may be related to bios (fake) raid, and not > an issue with linux software raid. But I am still unclear on this. So > to ask my remaining question more clearly, can I recover a lost disk > with the good one if it contains a mix of raid and non-raid partitions > on it, or does the whole disk need to be raid1 for recovery? >
My "server" is an IBM Netfinity box, which I bought ($150) to experiment with. It has 4 18 GB SCSI drives & 1 GB of memory. I have /boot on RAID 1 and created a RAID 5 array for everything else. I used LVM to partition that RAID array into the various partitions, such as /, /home, swap etc. -- Use OpenOffice.org <http://www.openoffice.org> -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
