On Mon, 11 Sep 2000, Pesce, Nicholas (FUSA) wrote:
Now, since I didn't put this box together. I was wondering if it is better to make all of these disks one volume. There are heavy reads and writes to the volume1, but I don't know if having a heavily used volume combined with root functions will kill my performance. Besides this will make a larger volume for more distributed writes (8 total disks versus 4). Also I will be saving 1 disk of data space because I won't need the second parity disk.
Search the NOW site for the NFS performance white paper. [0] The systems and numbers are dated (F330 with about 1,000 ops/s!) but Figure 3 "Performance Sensitivity to Number of Disk Drives" is pretty telling. A 14 disk RAID group (12d+1p+1hs) seems the way to go if you are concerned with performance.
[0] I don't have the document number, but the filename is nfsperf.pdf. I keep it handy at all times...
Until next time...
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