What is the average amount of hosts for a centralized system to backup at one time? We are a mixed Novell/NT shop...
with approximately 170 servers using Brightstor for Netware and Brightstor 2000. We are using two servers attached to multi-drive jukeboxes. As our backup window shrinks, how many remote hosts should each server be able to handle or should we be looking to add servers/jukeboxes?
I've seen backup servers maxed out by anywhere from 5 to 2500 hosts. There is no rule of thumb that would work everywhere or even for you without knowing more about your environment. What you do is you look for one of the following things to happen:
1. The I/O requirements of the backup indices/catalogs get too great for your server to handle. (If this is a Unix server, I'd tell you to run iostat and top. I would use the system performance monitor on NT/2000.)
2. You are backing up the maximum amount your bandwidth will allow. (100 Mb / 8 = 12 MB/s theoretical maximum. 12 MB X 60 seconds X 60 minutes X 8 hours = 345600. The maximum a 100 Mb connection could theoretically do is 345 GB in one night. If you're anywhere close to that, or even 70-80% of that, you've hit a wall.
3. The CPU or Memory on your box is completely gone, and you haven't experienced #2. If you can't upgrade the CPU or memory, it's time for another box. (By the way, #1 can cause #3.) Also, different backup software packages have different backup requirements.
Editor's note: Do you agree with this expert's response? If you have more to share, post it in one of our .bphAaR2qhqA^0@/searchstorage>discussion forums.
Related Q&A from Christopher Poelker
RAID can allow for better storage performance and higher availability, and there are many different RAID types. Read a comparison of RAID levels, as ...continue reading
SAN expert Chris Poelker discusses how to change the size of a LUN in a Microsoft cluster server environment.continue reading
SAN expert Chris Poelker compares connecting a SAN with wavelength cabling and dark fiber and discusses the pros and cons of each.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.