A New Kind of Home Computer: Windows Home Server Preview
by Ryan Smith on September 4, 2007 1:00 PM EST- Posted in
- Systems
WHS As A Backup Suite, Cont
As for restoring data, WHS comes with two options. The first is the traditional per-file restore, which can only be handled by a client. When a user/client wants to restore a file, they will pick the date/backup from which they want to restore the file, at which point the connector software will mount a dynamically-generated volume that is the contents of the client as of that backup. At this point the user can copy over files from the backup volume to their hard drive.
For a more complete restore, such as in the case of a catastrophic failure or those looking to use WHS as an image backup server, WHS ships with a live-restore CD. When the restore CD is inserted into a computer, the affected machine can connect to the WHS server and select a whole backup to restore. Since the operating system is included in the backup, it is also included in the restore, returning the machine to the same state it was in as of the backup. This process does however wipe the client's hard drive in the process, so it's not something that can be used leisurely. Power users that will be using it as a way to image and restore machines will especially appreciate the ability to restore to volumes of arbitrary size, and while Microsoft isn't pushing the imaging ability hard, it's one the best features of WHS.
There are a few caveats with the backup features of WHS that bear mentioning however. First and foremost only machines running Windows XP SP2 or Windows Vista x86 can be backed up. Older versions of Windows are not supported, and more surprisingly x64 versions of Windows are not supported. The WHS development team has cited the need to write drivers for the backup/restore abilities as the reason for the latter limitation, as they did not have the time to write a good set of drivers for both x86 and x64, so x64 support is not included for now. Unfortunately we don't have a good idea when such support will arrive; the development team for WHS is working on writing a version of the software for x64, but they are not saying when it might be ready.
Hardware constraints also need to be considered. Backups are transfer intensive, so anything less than a gigabit Ethernet link will cause the network to be the bottleneck. This is especially problematic for wireless links, which under 802.11g are practically capped to less than 6MB/sec (and realistically top out at under 4MB/sec), a fraction of the transfer rate of a hard drive. Microsoft highly recommends at least a 100Mb Ethernet link (forgoing a recommendation for wireless entirely), but wireless will work at the cost of being especially slow when WHS needs to do another full backup because it is ready to throw out the old one.
Last, there is the issue of doing backups at convenient times. A machine needs to be fully-on to be backed up, and WHS only has a limited ability to deal with AWOL machines and deal with machines that aren't currently on; it (or rather the connector) can wake up sleeping computers, but does not have a wake-on-LAN feature for waking up computers that are shut off entirely. An add-on exists that can handle this, but the only reliable way of backing up a machine at night is to leave it on or put it to sleep instead of turning it off. Sleeping however can be more problematic on an enthusiast computer than an OEM-built one.
With that said, it's very clear that Microsoft has put a lot of thought and their best technologies into the backup feature of WHS. Although this isn't a round up where we can adequately and fairly compare all the major backup software suites, we will say that we're very impressed with what WHS can do here. The backup features alone can sell WHS if the price is right as is the number of machines.
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Gholam - Sunday, September 9, 2007 - link
Cheap motherboard-integrated controllers corrupt and outright lose RAID arrays all the time due to driver bugs, and performance is atrocious. I won't trust a RAID5 array to anything that costs less that $500, and for that price, you can just stick a few extra drives for duplication.n0nsense - Sunday, September 9, 2007 - link
I did with LSI MegaRaid 500 with 128MB cache (originaly come with 32).I found it in second hand store for 50$ :)
actually you can buy new one scsi320 for ~300$
as for sata, there is IBM ServerRAID 7t, HP, adaptec and other controllers for ~300$
starting price of 150$ for 4 port SATA II controllers.
Personally, i prefer raid 10, but the problem is were to put the disks.
i already have 5 and only 1 empty slot left. (3x5.25 reserved for future water cooling)
n0nsense - Sunday, September 9, 2007 - link
I did with LSI MegaRaid 500 with 128MB cache (originaly come with 32).I found it in second hand store for 50$ :)
actually you can buy new one scsi320 for ~300$
as for sata, there is IBM ServerRAID 7t, HP, adaptec and other controllers for ~300$
starting price of 150$ for 4 port SATA II controllers.
Personally, i prefer raid 10, but the problem is were to put the disks.
i already have 5 and only 1 empty slot left. (3x5.25 reserved for future water cooling)
Gholam - Sunday, September 9, 2007 - link
A 5 year old controller that you pick up at a second hand store is not something that I - or an OEM - can base a line of products on. A new RAID5 controller which is not built by Promise or Silicon Image will run you $500+ - the ~$300 solutions are ZCR cards that are basically addons to $500+ motherboards. ServeRAID 8s costs around $700, HP P400/256 nearly $600, well over $800 for P400/512. A bigger case to store extra drives - or a few external USB/Firewire/eSATA enclosures - will run you much less.tynopik - Friday, September 7, 2007 - link
> power outage is not on option when we talking about some kind of server.don't tell me, that UPS is something you don't use.
1. ups is not something most home users will use, you have to design assuming it won't be there
2. even if you do have ups, what happens when the batteries die? often the only warning you will get is one day the power flickers and the system shuts off. do you replace all batteries every 2 years whether they need it or not?
3. even if you meticulously maintain your ups, the internal power supply can still go bad
> hardware problems will do the same to your system and its really does not matter what you running inside.
NOT TRUE
ntfs by itself is fairly fault tolerant. you yank the power you might lose a file, but everything else is fine
raid5, you yank the power you might lose EVERYTHING
that is why WHS file duplication is far safer and better
> of course i can give you examples of corporate Data Centers with 0 data loss, but we are talking about home.
of course i said it works if you're using ENTERPRISE LEVEL HARDWARE everywhere. Good raid cards start at $300. A $150 motherboard with onboard raid doesn't even begin to cut it.
> let's organize it from worth to best.
> no raid
> soft raid
> raid 1
> raid 1+0 or 0+1.
there is no such thing as 'best'
there is 'best for a particular set of requirements'
maybe your requirements are such that your best looks like that
my best would like
soft raid
raid 1
no raid
raid 1+0 or 0+1
(that's right, i would rather have no raid than 1+0 or 0+1)
> This press machines working at full load non stop 24/7/365. Year @ IT department, no problems with raid.
congratulations, you are one of the 70% who didn't have problems with their raid last year. Are you confident you won't be one of the 30% next year?
> for not very advanced user i will recommend Debian box with Bacula to manage backups, syncing, share etc.
not very advanced users aren't going to have a clue about Debian
not very advanced users are going to be setup up raid properly
n0nsense - Sunday, September 9, 2007 - link
Any UPS have connection to computer and will shut it down properly when configured to do so.As for controllers. I was surprised to find that almost all integrated raid controllers (including my), actually software and not hardware. So need to admit you were right about it. (I spent few hours to transfer my disks to Promise ST150 TX4 and rebuild the raid).
NTFS is the best in Microsoft's world. but since we can't run Windows on ext3 or reiserfs, or Linux on NTFS, we can't actually compare them in real world benchmark. Theoretically, NTFS is inferior. Actually any modern FS of all desktop systems is good enough.
So we still at the same point.
I agree with you that WHS is good for redundancy (if you enable this option) where you don't want to use real raid controller with "small" price tag.
But I just can't see justification to use it. Compared to alternatives it does not have something spacial enough to pay extra 180 USD. Yes I know that for most of users, Linux is something horrifying. But we are not talking about them, but about the WHS and alternatives. in this case about raid.
by the way, i'm very curious. what raid 1+0 or 0+1 did to you ? :)
that remind me to answer. shut down will cause you to lose open/unsaved files in any scenario. but it can also damage you entire HD. raid 5 will give you better redundancy then SINGLE disk(single data instance). but when duplicating, raid 1 is the best.
n0nsense - Thursday, September 6, 2007 - link
nForce (i'm not sure, but i think there is intel's chipset based MoBos with raid 5) raid still better in terms of stability, redundancy and performance then any soft raid.think what will happen if your WHS will crush unrecoverably.
how will you restore your data ?
n0nsense - Thursday, September 6, 2007 - link
Hello, if you have important things that you don't want to get lost or corrupted by some virus or anything else, do your self a favor and checkhttp://www.debian.org">http://www.debian.org
http://www.ubuntu.com">http://www.ubuntu.com
or any other user friendly distro.
you will find a way better solutions for home (and not only) server.
more exactly you'll find OS capable to be everything with more then proven stability and security.
and yes, it will work inside your MS environment. as for file server (and this is main purpose of home server), you will find much better performance.
You may want to extend it to be your media server. means really distributed one. server with tv card and clients on other boxes.
tynopik - Thursday, September 6, 2007 - link
> as for file server (and this is main purpose of home server)no, the main purpose of WHS is backup
if your main purpose is just a simple file server then yes, WHS probably isn't for you
mindless1 - Saturday, September 8, 2007 - link
Absolutely not. A server is not backup, it would be a very foolish thing to keep your back as an online windows box.