More Reliability for Your Money
The last thing you need is a
dead server. When your server goes down, your business generally goes with it.
That's why you need a machine that can minimize downtime, whether it's from a
software glitch, a hardware failure, or user error.
Some servers are low in cost, but they may be mediocre in performance. You
have to weigh the advantages of a larger-scale, more robust platform against the
cost of the system and of downtime. You don't gain anything by buying a $5000
bargain-brand server if you end up losing $10,000 an hour each time it crashes
or burns out a component.
That's when you need to consider a system such as one from the
Hewlett-Packard (HP) NetServer family to handle your mission-critical
applications. If you need high performance, you want the LS series. The
NetServer LS machines are designed to start up and stay up. If something goes
wrong, these machines make diagnosing and fixing the problem simple and quick.
Features such as hot-swappable disks (using either software or hardware RAID),
remote diagnostics and manipulation, and other automatic software- and
hardware-management capabilities all ensure that your system is reliable and
always available. We tested the NetServer 5/166 LS4.
Test System
Quad-processor 166-MHz Pentium>
128MB of RAM>
1MB of L2 cache per CPU>
8GB (4x2.0GB) Fast and Wide SCSI-2 disks>
Software RAID-5>
4X CD-ROM>
Remote Assistant Card
Processors
You can get an LS series machine in a variety of configurations, and you can
tailor its Pentium processors--not just memory and disk--to your needs. You have
a choice of clock speeds (100 MHz, 133 MHz, or 166 MHz) and from one to four
CPUs. (You can simultaneously run a uniprocessor and a dual-processor board in
one machine.) These options are easy to upgrade in the field simply by replacing
the processor boards when you need faster ones or by adding a board to boost the
number of processors from two to four.
Each CPU has its own 1MB Level 2 cache unit--but only 512KB on the 100-MHz
and up uniprocessor boards--which significantly improves system performance over
machines with shared cache for dual-processor boards. In a Windows NT
Magazine Lab test script, we used Adobe Photoshop 3.0.5, which sports
symmetrical multiprocessing (SMP) capabilities. We recorded a 30% to 50% speed
boost for each additional CPU. On a shared-cache system, we saw only a 10% to
15% boost.
HP's proprietary Extended Express Bus, a high-speed, scaleable bus for SMP,
further enhances the CPU performance of the NetServer LS. HP and Intel jointly
developed this 64-bit main system bus, which runs at 66 MHz. It has a
theoretical data-transfer limit of 6400MB per second (MBps), thus providing a
great deal of growth potential for more and faster peripherals and for faster
CPUs. With current PCI technology (32-bit, 33 MHz, running at 132MBps), however,
the system uses only 264MBps of that bandwidth (the average data-transfer rate
with a dual PCI bus architecture).
The CPU-to-cache bus runs with an effective bandwidth of 528MBps, so the
system's architecture won't be an impediment to future upgrades. Its
data-throughput capabilities make it ideally suited for information-intensive
tasks, such as transaction and database processing, or as a multi-user
compute/file-and-print server. Windows NT operates well on this machine, which
fully uses NT's 32-bit power, SMP, and software RAID capabilities.
Memory and I/O
The test system came with 128MB of RAM, which is about right for a
quad-processor machine. Using two daughter cards, the NetServer 5/166 LS4 can
support up to 768MB of error-correcting code (ECC) parity memory; one card (64MB
standard) comes with the stock configuration. The ECC memory has a high level of
redundancy, so most hardware failures will be transparent to end users. While
the system stays up and running during such a problem, the system administrator
is notified of the fault. You can use the supplied diagnostic utilities to
determine the location of the bad memory module and replace it during the
server's scheduled downtime.
The I/O capabilities of the NetServer LS are extensive, to say the least.
The I/O bus is what HP calls a Dual Peer PCI Bus, a peer-to-peer architecture
where both PCI buses talk to the system bus, providing a full range of PCI
capabilities. Each PCI bus is 32 bits wide with a bandwidth of 132 Mbits per
second (Mbps). This design allows for more PCI slots without the slowdown of a
bridge architecture. You can separate devices of differing speeds to optimize
the performance of your system. For example, you can separate your slow network
cards from your fast SCSI controllers. Five PCI slots are on the single- and
dual-processor systems, but only four slots are available in the quad-processor
version--the extra processor card blocks one slot.
Dual PCI Fast and Wide SCSI-2 controllers are embedded on the
motherboard--equivalent to two Adaptec 2940W controller cards--giving you a
multitude of storage options. The NetServer LS has out-of-the-box RAID mirroring
and duplexing without any extra hardware because of the two embedded
controllers. For example, you can configure your system for fault tolerance in
the operating-system partition and other system resources on the internal disks.
Then you can use a separate controller and an external disk subsystem for data.
The main CPU chassis can hold up to 25GB. Its pedestal form-factor can hold
up to six half-height 3.50" hot-swap drives: Each bus can control three
drives, with RAID 0, RAID 1, software RAID 5 (operating system-dependent),
striping, striping with parity, or mirroring to enhance performance.
You have several other options in configuring your disk subsystems. You can
use a single hard drive that holds the operating system, on one embedded
controller (install the drive in the common 5.25" bay) and run the RAID
drives for data only, on the remaining controller. Or, you can put the six
hot-swap drives on one bus and use the second bus for an external storage
subsystem holding up to an additional 25GB. The system supports fully
hot-swappable disks if you use HP drives, and you have an option for RAID 6 via
a PCI RAID disk-array controller. The performance depends on your data mix, so
you have to base your decision between software and hardware RAID on your users'
needs. However, in the case of a hardware failure, hardware-based RAID is faster
than software-based RAID on the rebuild, and the performance hit during the
failure is slightly lower.
Other standard hardware includes a 4X CD-ROM drive, a floppy disk drive,
and a bay for a half-height 5.25" device, such as a backup tape drive.
There are two PCI, four EISA, and two shared bus-master expansion slots, and a
standard set of external ports: one enhanced parallel, two 9-pin serial, video,
and PS/2-style keyboard and mouse. The NetServer's video is an accelerated EISA
SVGA controller from Cirrus Logic, with 512KB of DRAM, upgradeable to 1MB.
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