On 07/14/2012 12:56 PM, Reindl Harald wrote: >> If your rotating disk will always be connected, you may want to have >> a unique VG across both the SSD and the HD, so you can move partitions >> across them and have more flexibility. >> For example, if you realize to need some more space on a SSD filesystem, >> you still have to ability to enlarge the partition into the HD and cope with >> a partially-here/partially-there layout. >> This road can lead to very interesting tricks, such as having the >> journal and metadata on SSD and actual data on HD. > > and what happens if ONE drive fails? Maybe restore from backup? Backups on Linux are trivial: external drive + rsync/rsnapshot. Not having a backup is a risk even with only one drive. HDs fail, SSDs fail, laptop are dropped/lost/stolen. Protecting your data doesn't imply you have to run away from RAID-0 in panic. > colume groups over different drives are a VERY bad idea > as long LVM does not sit on top of a RAID! > > having as example a LVM over 3 drives makes it 3 times > more possible to lose the whole volume groups data > if one drive goes down Yes. A 500,000 hours MTBF is 114 years of usage (at 12 hours per day). Three similar drives in RAID-0 is 38 years of usage (at 12h/day). > this is the same as for RAID0: do it only if it does > not bother you losing your data! Don't be so dogmatic. Just estimate the risk and take countermeasures. As regards my future SSD+HD project that I cited before, be assured that I'm using 2 RAID1 SSDs and 8 RAID10 HDs. Plus rsync backups every 4 hours. Plus daily remote backup. But this is a production server. On a laptop you can't do that; the laptop is so easily damaged/lost that your data should be backupped anyway just for that; at that point why not play with some smart disk arrangement to make it work faster? -- Roberto Ragusa mail at robertoragusa.it -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
