-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Les Mikesell wrote: > If you are writing small files and doing directory operations you > are back to waiting for the heads to seek. But since you have more heads, do you still have to wait for all of them, or is the one that you want to move more likely to be available to go and fetch the data you want?
Consider the difference with 3 x 500G drives and 5 x 250G drives. If both are in RAID5 then you will get 1TB storage space. To do any operation on the 5 x 250 drives, would it not be more likely that the bit of data you want to read (or write) is on a drive whose heads are not already busy doing something else? I don't think it would be such a great idea, but if you extrapolated this to using say 20 x 120G drives, would that improve things further? (I wouldn't like to do it, because the chance of losing 2 drives from 20 would be greater than losing 2 from 5) PS, I seem to recall there is an upper limit to the number of drives in a RAID5 of 7 or 8, so the above is probably not possible. Also, since backuppc seems to read a lot more data than it writes during a backup, would it be fair to suggest that it is better to use RAID1 rather than RAID5 ? Or even RAID 1 + 0... you could get 3TB usable space with 6 x 1TB disks... Regards, Adam - -- Adam Goryachev Website Managers Ph: +61 2 8304 0000 [EMAIL PROTECTED] Fax: +61 2 8304 0001 www.websitemanagers.com.au Please note, all email from me sent after August 2007 will be signed. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHzJDrGyoxogrTyiURAoU9AJ9hpEktU+FIitZk39VEt97AcnkRBgCgrAjk Sa33AJY64h9kazmuZoxy8qQ= =D+O0 -----END PGP SIGNATURE----- ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
