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Archive for June, 2009
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June 11, 2009

Troubleshooting Slow Read/ Transfer Speeds for a Windows Home Server

After recommending WHS to a friend I got a note saying it was running really slow for pulling data off the server, even though writing data was fine. As this friend is not so technically apt, I decided to setup quick test machines, one running Vista 64 the other WHS. Both were using a Dell Perc 5/i raid card and two 500GB 7200rpm Western digital drives in raid 0 (I would never do this in practice, but these were solely built for test purposes.)

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June 9, 2009

3x Seagate Cheetah 15k.5 Raid 5, Adaptec 3085

Just to check some additional 15k rpm SAS numbers, I used three Seagate Cheetah 15k.5 300GB drives in Raid 5 to see what the numbers would look like. The drives are 3.5″ form factor units so they run quite a bit warmer than the 15k.1 2.5″ Savvios that are also in this machine. First the chart:

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June 8, 2009

Issue: Adaptec 5805 with Savvio 15k.1 Drives

Did some testing this weekend with the new Adaptec 5805. Since I wanted to see what this card could do, I decided to try it with some cheap Seagate Savvio 15k.1 36.7GB SAS drives. Overall performance is fine, however there was a consistently interesting note in ATTO’s benchmark at 64k. I tried every stripe size imaginable, and there was a distinct fall-off every time in read speeds. I also tried the newest firmware, same result. Truly odd indeed.

8x Seagate Savvio 15k Raid 5 Adaptec 5805

Notice the dip in read performance at 64k. This seems to be very strange and did not go away with three different firmware versions.

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June 8, 2009

7200.11 1.5TB Raid 5 Benches on a $120 Perc 5/i 512MB

Although more will follow, here’s a quick glimpse of what a cheap, but quality hardware raid solution can do with cheap, and large SATA drives in Raid 5. Keep in mind that the Perc 5/i uses the old IOP333 CPU clocked at 500MHz. Many current 3 series Adaptec products, for example, utilize the IOP333 at 800MHz. Also, one should note that there are reports that the IOP348 has some issues with SATA drives making the below representative of very inexpensive ($1000) raid arrays with huge capacities.

Raid 0 with 8 Seagate 7200.11 1.5TB drives with a Dell Perc 5/i 1MB stripe

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