Hi Shyam:
Yes, I've seen that pdf before. Unfortunately, none of the documentation
I have, nor none of exploration of mdsm, has led me to the answers, hence
my emails to this list. It is all high-level.
I'm aiming for specifics. I think once I have answers to the simple
request of how to create a snapshot of a live filesystem under
RedHat/CentOS using the snapshot feature, where the snapshot lives, and
how to access it, I'll then be able to place this device into production.
Lack of these answers is what is holding back use of this device.
Thanks.
Scott
On Thu, 11 Dec 2008, [EMAIL PROTECTED] wrote:
Scott wrote:
I have a Dell MD3000i connected to a PowerEdge 2950 server running
out-of-box CentOS 5.2 64-bit, unpatched, on an isolated test LAN.
I also purchased the snapshot premium feature.
Using the included Modular Disk Storage Manager, I successfully
activated the premium feature, and manually created two RAID 5 arrays +
1 hot spare.
By manually, I used MDSM instead of letting the software automatically
allocate all disk space for me. I deliberately selected manual and
allocated 50 GB minus the 550 GB of each of the two RAID 5s, thus RAID 5
#1 (call it fs1) = 550 GB - 50 GB for snapshots = 500 GB for RAID 5,
50 GB for snapshots; same for RAID 5 #2 (call it fs2).
Log back in to the md3000i via iscsiadm, perform an fdisk -l, and see
4 x 500 GB partitions (2 x 500 GB per RAID 5, 2 x 500 GB per snapshot).
A few questions now -
- how do I actually create snapshots of fs1 and fs2? What specific
command do I use, and what specific options do I give it? No
documentation I have, including the index of CLI commands, gives a good
enough idea/hint of this
- how do I access/view the location where the snapshots are
stored/created (to retrieve data if needed)
- under MDSM's disk groups and virtual disks, it shows 500 GB for fs1,
500
GB for snapshot, and 50 GB for snapshot-repo. What/where is the 50
GB?
Fdisk -l doesn't show it.
I guess this has been asked before in the linux-poweredge mailing list
here
http://lists.us.dell.com/pipermail/linux-poweredge/2008-July/036871.html
.
You might also look at documentation here at
http://www.dell.com/downloads/global/products/pvaul/en/data_protect_md30
00i.pdf.
Shyam Iyer
Dell Linux Engineering
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