: For example, using a Sparc 1000E server with 1gb of ram, and two raid
: 5 disk arrays(fast and wide). This system only gets 5megs per sec. xfer rate.
: I pull the disk arrays, and put them on a SGI DM system (basic), and run the
: same dd command (dd if=/dev/zero of=/array_mount_point/file.test bs=1024k
: count=19531) which SGI gives about 14 megs per sec. xfer rate. So I called
: Sun, and they thought that the 5megs per sec. was great! Great? I think
: they need to have another look at the device drivers / kernel.
: Now, my Linux box using the same test gets 8megs per sec. It is a P5/90
Thanks for the SGI plug :-) I'll add to your fire. By way of background,
I'm a kernel hacker that used to work at Sun and now works at SGI. This
sort of I/O stuff is my area of expertise. You can discount my ravings
because I work for SGI, but you should trust that I know what I'm talking
about in this area; ask people, even Sun engineers will admit it :-)
I can happily say that SGI blows the socks off of any Sun system in
terms of disk or network I/O. I'm currently working on being able to
do at least 50MB/sec disk <-> net <-> remote machine. I've done my own
testing on SGI systems and I can get 18MB/sec per fast&wide SCSI
string using just 3 disks. Sure wish I had 100MB/sec SCSI strings...
On the lab nmachine we use for NFS performance, I've done 162MB/sec of
disk reads, sustained. Personally. I went into the lab and watched
all those pretty lights going. I couldn't do any more than that because
I had 9 fast&wide SCSI strings. Notice that the scaling was 100%
linear -- 162/9 == 18.
But that's no big deal, get a load of this. SGI has a *file system*
that goes that fast. Faster, in fact. The xFS file system has been
measured running at 350MB/sec by Cray computer engineers (they're
bummin - their RAM disks aren't that fast, no kidding) Internally,
we've had it up to 450MB/sec (I haven't seen that one myself, I don't
have that many disks). By the way - the performance numbers are one
process doing normal reads. No multi threading required.
In addition, SGI's network walks all over Sun's network. I regularly get
over 70MB/sec through TCP/IP over HiPPI cables. Try and do that with a
Sun (good luck).
SGI's MP's just blow the frigging doors off of Sun hardware &
software. Sun may have more market share but they don't have a chance
of competing with SGI in terms of I/O. SGI is at least a couple orders
of magnitude faster. Sun doesn't stand a chance - if you care about
I/O, you buy an SGI.
: -> It's not funny anymore.. Does anyone acutally like Solaris2?
No. Never did, never will. It's part of why I left Sun.