1 |
On 16/03/2010 19:57, Stroller wrote: |
2 |
> How does your system boot if your RAID1 system volume fails? The one |
3 |
> you have grub on? I think you mentioned a flash drive, which I've seen |
4 |
> mentioned before. This seems sound, but just to point out that's |
5 |
> another, different, single point of failure. |
6 |
Well, at the moment, I don't have a RAID system... A flash drive (USB |
7 |
key) seems a reasonable strategy - I could even have two containing |
8 |
identical data - so, if the first were to fail then the second would |
9 |
kick in - if not automatically - then after the duff flash-drive is |
10 |
removed. A neat side effect of this would be to eliminate a moving part |
11 |
on the server - making it quieter... and the drives themselves can be |
12 |
located at two physically remote places on my LAN. |
13 |
|
14 |
>>> by one client at a time), the simplest solution is to completely avoid |
15 |
>>> having a FS on the storage server side -- just export the raw block |
16 |
>>> device via iSCSI, and do everything on the client. |
17 |
>> ... |
18 |
>> Snap-shots, of course, are only really valuable for non-archive data... |
19 |
>> so, in future, I could add a ZFS volume using the same iSCSI strategy. |
20 |
> If you do not need data sharing (i.e. if your volumes are only mounted |
21 |
Yes - I don't think I'd need sharing. It strikes me that it should be |
22 |
possible to have a 'live' backup server which just reads until |
23 |
fail-over... with a different /var/* - of course. |
24 |
|
25 |
> I have wondered if it might be possible to create a large file (`dd |
26 |
> if=/dev/zero of=/path/to/large/file` constrain at a size of 20gig or |
27 |
> 100gig or whatever) and treat it as a loopback device for stuff like |
28 |
> this. It's not true snapshotting (in the ZFS / BTFS sense), but you |
29 |
> can unmount it and make a copy quite quickly. |
30 |
You could, but the advantage of ZFS is the efficiency of snap-shots. |
31 |
With your strategy I'd need to process all of the large file every time |
32 |
I want to make a snapshot... which, even for a mere 100gig, won't be quick. |