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SAS or SATA drives for high speed network backups

post #1 of 7
Thread Starter 
At work we have an esxi server that uses veeam to backup the VM's to a 3TB esata drive mounted on a separate computer in a hotswap bay. Once a week it does a full backup, every night it does incrementals. That hotswap drive gets swapped out once a week (pretty much on a random day) and taken off site. Right now every time we change the drive and remount it, the incremental backups fail until they get manually restarted with a new full backup.

My idea to fix this was to have a permanent drive in the "backup" computer, so that back ups continue without a hitch and then clone that drive to the esata hotswap drive once a week when it's swapped out.

The IT guy wants to use SAS for the permanently mounted backup drive. This means changing the controller card as it doesn't have SAS right now. There are also only 2 3TB sas drives to choose from and they're pretty $$$ (600 + a pci-e sas/esata card)

Is there any reason to choose SAS over an enterprise sata drive e.g. a WD RE4 sata drive? I know the RE4 doesn't come in 3TB, but we could just put 2 or 3 in raid 0 which would be faster than the SAS drive anyway. 2x1.5TB RE4 drives would be about $220 total.

Any thoughts?
     
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post #2 of 7
SSD whitepaper: http://www.stec-inc.com/whitepaper/differSSD.pdf

"This chart demonstrates the performance difference in write IO between SATA SSD’s (green and red lines) and an enterprise SSD with a SAS interface (blue line) while running an SQL database for many days non-stop. Notice that the enterprise class SSD maintains a steady state performance 5X higher than the SATA SSD drive."
Edited by jlells01 - 10/23/11 at 11:03pm
post #3 of 7
SAS would be faster than SATA an probably ideal for what you would be doing. Seek times and disk spin aka RPMs. I don't know what is the size of your backups and can probably get away with the SATA but if the company can afford it get the SAS. I am a sysadm and I understand that saving $$ money to a company is always good but it is also very important to keep the data of the company save so it is sometimes better to spend a bit extra than to skimp and later be sorry especially if that is part of your job.
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post #4 of 7
Thread Starter 
Cool thanks, but why are sas faster than sata? Only the small drives spin faster than sata drives (the 3tb drives are 7200 rpm) and the interface is compatible (at least 1 way) so what's the difference? Surely 2 raid 0 enterprise sata drives would be faster than 1 sas drive? Presumeably the reliability is similar.

SSD's are out of the question, no need for that much speed or cost.
Edited by stren - 10/24/11 at 12:00am
     
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post #5 of 7
If you are using 3.5 instead of the 2.5 which seems to be the case the spin might be lower didn't knew they were 7k but then again TB SAS drives are recent. As for the seek time with Raid 0 your seek time would improve but don't know how much on the specific WB you mention. Also the SAS are more reliable in terms of read errors.

You can get away with the raid 0 and might have similar performance in terms of speed. Also since you would be doing backups into other media I suppose and move them off site it might be a good choice to use SATA. Would it be from the VM into these drives and then to the Media off site?

Personally I would do other raid besides 0 (at work I have it set to 5 and assign a spare drive for when one fails) since the data would be here and if time to complete the backup is not important you can always leave it overnight or just go SAS it seems like someone there already wants to do it that way. GL
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post #6 of 7
Thread Starter 
Yes it would be VMs to this drive and then once a week cloned to a a hotswap drive that goes offsite.

I suppose I could just use SAS drives in raid 0. Because it's a backup with it's own offsite backup I'm not too worried about losing a drive. The main server has a raid 6 on it for the local vm storage so we're pretty much good on redundancy.
     
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post #7 of 7
Sounds like a good plan!
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