I'm a little confused on RAID1...running 2.2.11 with
raid0145-19990824-2.2.11.bz2 on a PII/233
I just set up a mirror this weekend on an IDE RAID1 - two 5G disks on the
same IDE bus (primary and master).
I was under the impression that I shouldn't see any slowdown and maybe even
a speedup but, alas, it is not so.
Here's the hparm test (ran several times -- similar results each time):
/dev/hda:
Timing buffer-cache reads: 64 MB in 0.95 seconds =67.37 MB/sec
Timing buffered disk reads: 32 MB in 3.28 seconds = 9.76 MB/sec
/dev/md0:
Timing buffer-cache reads: 64 MB in 0.85 seconds =75.29 MB/sec
Timing buffered disk reads: 32 MB in 6.10 seconds = 5.25 MB/sec
It looks like I've lost half of the bandwidth on disk reads. Did I miss
something?? Here's the raidtab entry:
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
persistent-superblock 1
chunk-size 4
device /dev/hda1
raid-disk 0
device /dev/hdb1
raid-disk 1
________________________________________
Michael D. Black Principal Engineer
[EMAIL PROTECTED] 407-676-2923,x203
http://www.csi.cc Computer Science Innovations
http://www.csi.cc/~mike My home page
FAX 407-676-2355
