Date: Sat, 30 Oct 1999 06:14:32 +0200 From: Tor.Egge@fast.no To: wes@softweyr.com Cc: sjr@home.net, freebsd-hackers@FreeBSD.ORG Subject: Re: CCD questions Message-ID: <199910300414.GAA22428@midten.fast.no> In-Reply-To: Your message of "Fri, 29 Oct 1999 12:05:30 -0600" References: <3819E1EA.83DD04B7@softweyr.com>
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> Because Vinum is being maintained, and because Vinum will allow you to
> stripe your disks instead of simple concatenate them, which will probably
> result in better I/O rates.
Some simple measurements shows ccd to be slightly faster when striping
11 disks, then running 130 threads reading 1MB blocks from random
sector-aligned positions in a 10 GB file.
with Vinum: 70 MB/s (2 of the 11 subdisks shown in iostat output)
tty da5 da6 cpu
tin tout KB/t tps MB/s KB/t tps MB/s us ni sy in id
0 94 171.82 36 5.96 174.53 38 6.48 0 0 16 3 80
0 35 173.90 36 6.13 174.79 36 6.10 0 0 9 3 88
1 47 175.33 35 6.01 173.96 38 6.44 0 0 9 3 88
1 378 175.69 38 6.53 170.85 38 6.28 0 0 9 3 88
1 37 176.47 37 6.42 173.21 35 5.87 0 0 9 3 88
0 36 176.05 39 6.72 172.27 35 5.87 0 0 9 3 87
0 36 168.95 40 6.60 172.89 36 6.14 0 0 9 4 87
0 36 169.44 39 6.42 171.73 38 6.30 0 0 8 4 88
0 36 172.64 37 6.24 174.79 38 6.44 0 0 9 3 88
With ccd: 80 MB/s
tty ccd1 cpu
tin tout KB/t tps MB/s us ni sy in id
0 39 204.46 408 81.56 0 0 5 1 94
0 39 205.28 413 82.75 0 0 5 1 94
0 39 204.91 438 87.72 0 0 7 1 92
0 39 204.96 429 85.96 0 0 6 1 93
0 39 205.13 439 87.85 0 0 6 1 93
0 39 204.80 448 89.61 0 0 5 1 94
0 39 204.77 428 85.66 0 0 5 1 94
0 39 204.66 440 87.95 0 0 6 1 93
0 39 205.58 421 84.61 0 0 5 1 94
ccd is also capable of striping disks with different sizes.
- Tor Egge
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