No. Both drives have to be the same size for any type of raid. It’s a requirement of the specification.
Mixing differing sized drives in the same raid causes big problems (usually with cylinder allocation, numbering and other issues). Also, if the smallest drive is the first in the raid, any extra space on the larger drives will be ignored and only the space of the smaller drive will be allocated on the others. That means a lot of wasted space. It doesn’t matter which method of raid you use, this will be true regardless. Best to have all drives the same size. -Eric > On Dec 16, 2018, at 12:28 PM, Ramy Moustafa <ramy.moustaf...@gmail.com> wrote: > > Aha, most of my data i need them badly will be more than that. > but, i have an idea. > I have my 4 Tb HD, and another 1 with 2 TB of data, > can i use them together but not at the same time? > I mean that i will make my backup every friday, can i connect the 2 HDs and > ask the time machine to use them for ba backing my data? > > >> On Dec 16, 2018, at 5:24 PM, 'Tim Kilburn' via MacVisionaries >> <macvisionaries@googlegroups.com <mailto:macvisionaries@googlegroups.com>> >> wrote: >> >> Hi, >> >> Officially, yes. Unofficially, it all depends on how much data you >> currently have. Each of your externals may hold up to a TB, but how much >> data is actually stored on them? Add up the amount of data, then multiply >> it by 1.5. If that is more than 4 TB, then you're probably able to use the >> 4 TB HD as your backup drive. If your total without multiplication is >> already over 4 TB, then you're out of luck. You cannot back up 6 TB onto a >> 4 TB drive no matter what solution you find. Compression won't help. You >> might be able to use a combination of solutions. That is, use iCloud Drive >> to store your Desktop and Documents folder from the computer itself, then >> use the 4 TB drive just to back up the externals. Either way, if you do >> have 8 TB of actual data, then you need 12 to 16 TB of available space to do >> a reliable backup. Realize that the first backup would likely be 10 to 11 >> TB on an 8 TB source, then you need free space for subsequent backups. >> Otherwise, you're just keeping a backup for a very short time and the older >> data is purged very quickly, which makes your recovery options very limited. >> >> Later... >> >> Tim Kilburn >> Apple Teacher >> (with Swift Playgrounds Recognition) >> Fort McMurray, AB Canada >> >> On Dec 16, 2018, at 02:49, Ramy Moustafa <ramy.moustaf...@gmail.com >> <mailto:ramy.moustaf...@gmail.com>> wrote: >> >> Aha i understand now. >> but all my external HDs will be more than 4 TB, and i will not be able to >> buy 8 TB HD. >> All my data now are 8 TB storage, so, must i buy 16 TB hard drive? >> so, what will be teh 2nd solution? >> >> >>> On Dec 14, 2018, at 4:31 PM, 'Tim Kilburn' via MacVisionaries >>> <macvisionaries@googlegroups.com <mailto:macvisionaries@googlegroups.com>> >>> wrote: >>> >>> Hi, >>> >>> No, it can be just one backup volume. First limitation is that the backup >>> volume should be about twice as big as the data being stored. So, if you >>> have less than 2 TB of data that needs backed up, then a 4 TB Time Machine >>> backup volume is perfect. If the total is greater than that, you might be >>> fine, but the backup may run out of space too quickly. All that out of the >>> way, you just go into your Time Machine pane in System Prefs, press the >>> Options button and make sure that none of your external drives are excluded >>> from the backup. Essentially, that's all you need to do. Leave all drives >>> connected all the time and let Time Machine do its thing automatically. >>> Note that the first backup may take days as the data is being prepared for >>> and backed up to the new drive. All subsequent backups should be much >>> faster. >>> >>> Later... >>> >>> Tim Kilburn >>> Apple Teacher >>> (with Swift Playgrounds Recognition) >>> Fort McMurray, AB Canada >>> >>> On Dec 14, 2018, at 06:32, Ramy Moustafa <ramy.moustaf...@gmail.com >>> <mailto:ramy.moustaf...@gmail.com>> wrote: >>> >>> >>> >>> My friends: >>> I finally got 4 tb hard disk, that i plan to use it for weekly backup, >>> I have more than 3 hard disks that i hope to backup them on this hd, so, >>> must i divide this new hd to 3 volumes to use time machines? >>> or what is the best thing? >>> Thanks for helping.Ramy moustafa saber >>> licturer at: >>> faculty of musical education >>> music arranger and sound engineer >>> Sent from my iPhone >>> >>> -- >>> The following information is important for all members of the Mac >>> Visionaries list. >>> >>> If you have any questions or concerns about the running of this list, or if >>> you feel that a member's post is inappropriate, please contact the owners >>> or moderators directly rather than posting on the list itself. >>> >>> Your Mac Visionaries list moderator is Mark Taylor. 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You can reach mark at: >>> mk...@ucla.edu <mailto:mk...@ucla.edu> and your owner is Cara Quinn - you >>> can reach Cara at caraqu...@caraquinn.com <mailto:caraqu...@caraquinn.com> >>> >>> The archives for this list can be searched at: >>> http://www.mail-archive.com/macvisionaries@googlegroups.com/ >>> <http://www.mail-archive.com/macvisionaries@googlegroups.com/> >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "MacVisionaries" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to macvisionaries+unsubscr...@googlegroups.com >>> <mailto:macvisionaries+unsubscr...@googlegroups.com>. >>> To post to this group, send email to macvisionaries@googlegroups.com >>> <mailto:macvisionaries@googlegroups.com>. >>> Visit this group at https://groups.google.com/group/macvisionaries >>> <https://groups.google.com/group/macvisionaries>. >>> For more options, visit https://groups.google.com/d/optout >>> <https://groups.google.com/d/optout>. >> >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: >> mk...@ucla.edu <mailto:mk...@ucla.edu> and your owner is Cara Quinn - you >> can reach Cara at caraqu...@caraquinn.com <mailto:caraqu...@caraquinn.com> >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/macvisionaries@googlegroups.com/ >> <http://www.mail-archive.com/macvisionaries@googlegroups.com/> >> --- >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to macvisionaries+unsubscr...@googlegroups.com >> <mailto:macvisionaries+unsubscr...@googlegroups.com>. >> To post to this group, send email to macvisionaries@googlegroups.com >> <mailto:macvisionaries@googlegroups.com>. >> Visit this group at https://groups.google.com/group/macvisionaries >> <https://groups.google.com/group/macvisionaries>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. >> >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: >> mk...@ucla.edu <mailto:mk...@ucla.edu> and your owner is Cara Quinn - you >> can reach Cara at caraqu...@caraquinn.com <mailto:caraqu...@caraquinn.com> >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/macvisionaries@googlegroups.com/ >> <http://www.mail-archive.com/macvisionaries@googlegroups.com/> >> --- >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to macvisionaries+unsubscr...@googlegroups.com >> <mailto:macvisionaries+unsubscr...@googlegroups.com>. >> To post to this group, send email to macvisionaries@googlegroups.com >> <mailto:macvisionaries@googlegroups.com>. >> Visit this group at https://groups.google.com/group/macvisionaries >> <https://groups.google.com/group/macvisionaries>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor. 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If you have any questions or concerns about the running of this list, or if you feel that a member's post is inappropriate, please contact the owners or moderators directly rather than posting on the list itself. Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: mk...@ucla.edu and your owner is Cara Quinn - you can reach Cara at caraqu...@caraquinn.com The archives for this list can be searched at: http://www.mail-archive.com/macvisionaries@googlegroups.com/ --- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to macvisionaries+unsubscr...@googlegroups.com. To post to this group, send email to macvisionaries@googlegroups.com. Visit this group at https://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
