If you have a 24x7 work cycle, avoid the green drives. They won't last. Red drives are reasonable and there are a lot of articles out there on the web about people using the red drives in production for 24x7. They generally have a 3 year warranty. If you expect to be doing active caching or other high-intensity workload, I'd go with the black drives.
On Fri, May 16, 2014 at 3:36 PM, Dan Ritter <d...@randomstring.org> wrote: > On Fri, May 16, 2014 at 03:23:13PM -0400, john boris wrote: > > I have to rebuild my remote Backup Server (A place for my servers to > backup > > to hard dirves). I currently have a LINUX system with a RAID 5 array of > > 300GB SAS drives (Total 1.5TB) which has to be increased to 4TB or larger > > (sorta depends on the cost) We are virtualizing 22 of my servers which > > currently use on board tapes for Master Backups and then do differentials > > each night to my Backup Server over our WAN at night. Because this server > > will now be holding Master Backups I need to grow the space. I don't have > > the money nor budget to get any dedupe system or some other appliance. > > > > I started looking for drives and hit the smorgasbord of Green/Red > 32mb/16mb > > cache and the prices are all over the place. I can get a 1TB drive for > $133 > > (approx) but the 500GB drive is $270 with a smaller cache. Same > > manufacturer and distributor. My RAID system has 8 slots which I want to > > use. There will be two arrays in the system. RAID1 (Mirrored for the oS) > > and the rest of the slots for RAID 5. Currently it is all one big array > and > > also uses LVM which I am not going to use when I rebuild this thing. > > > > So I am looking for some insight on what performance specs I should be > > looking for in such a project. I must confess as I type this I probably > > will also look at a NAS unit that would be comparable size and cost. > > > > My systems use a Backup program from Microlite (BackupEdge) which works > > just fine for what we do and hasn't failed me yet. (looking for some real > > wood to knock on). > > You have a backup server, it has 8 3.5" SAS/SATA disk slots, and > you want to backup 22 machines nightly? > > You don't want RAID5. Use RAID10. 6 x 3TB will get you 9TB of > usable space, and a rebuild on a failed drive will involve much > less overhead. Your NICs are likely to be the bottleneck. > > The per-disk cache is not going to be interesting, because backups > are large contiguous writes and large contiguous reads. SAS vs SATA > isn't going to help unless you're buying dual-port drives for controller > redundancy, which you didn't mention. 7200RPM SATA disks with a 5 year > warranty run about $200 each. (WD Black at NewEgg.) > > -dsr- > _______________________________________________ > Tech mailing list > Tech@lists.lopsa.org > https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech > This list provided by the League of Professional System Administrators > http://lopsa.org/ >
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