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UNIX noob, enterprise storage expert


Apr
18
comment Hard and soft zoning vs. port and WWN zoning
Not related to the answer, but port zoning is the best practice for FICON fabrics
Apr
17
comment Brocade mirror ports
So you would recommend XGIG for mirror ports?
Apr
16
comment What limits a Device not to detect multiple LUNs behind a single target?
This question is overly broad, but I sense that you are having a problem detecting more than one LUN on a system you expect to be able to see more. If that's the case, please edit your question to provide more details about the problem. As it is, there is nothing preventing multiple LUN detection except a problem of some sort.
Apr
16
answered What limits a Device not to detect multiple LUNs behind a single target?
Apr
15
comment Can NetApp Snapshots be used as Backups?
You want to have some fun? Try doing snapshots on a snapmirrored volume for flexclones of the target. Then try using 100% of the non-reserve space on the source. It works until the snapshot backing that flexclone gets deleted on the source volume, at which point replication stops.
Apr
15
revised SAN zoning advantages and disadvantages
edited tags
Apr
15
awarded  Nice Answer
Apr
15
comment less IOPS number but better READ/ WRite performance
not at all, but it's also not an answer to your question, because your questions is not logically consistent.
Apr
14
comment less IOPS number but better READ/ WRite performance
Do you know what IOPS are? It's the number of IOs done per second. Read/write performance can be measured in IOPS, so what you asked is like asking "can KM/h be less than speed".
Apr
14
comment Can someone explain the important differences between fabric, point to point, and loop on a fibre san?
I've never tried it to be certain, but obviously NPIV won't on the port negotiating as FL. I suspect it would be able to connect with another NPIV device, but since this is a storage port, you don't technically need to worry. I've seen EMC refuse support on fabrics containing loop ports, but not HP.
Apr
13
comment Can NetApp Snapshots be used as Backups?
Snapmirroring to another filer won't protect you from snapshot autodelete shortening your recovery point, though. It does protect against volume deletions and filer loss, though.
Apr
13
comment Can someone explain the important differences between fabric, point to point, and loop on a fibre san?
Yeah, my answer is a little vague, but it boils down to the fact that there's no advantage to loop devices other than that they don't need a switch. In order to support NPIV, they took over the part of the address that used to be used for loop devices.
Apr
13
revised Can someone explain the important differences between fabric, point to point, and loop on a fibre san?
Updated based on new info
Apr
13
revised Can someone explain the important differences between fabric, point to point, and loop on a fibre san?
added information
Apr
13
revised Can someone explain the important differences between fabric, point to point, and loop on a fibre san?
Updated based on new info
Apr
13
comment Can someone explain the important differences between fabric, point to point, and loop on a fibre san?
Ah, I see now. I'll update my answer.
Apr
13
comment Can someone explain the important differences between fabric, point to point, and loop on a fibre san?
That doesn't involve connecting them as fabric loop ports, which is why I left it out. I didn't want to muddy the waters :) Although I guess that's kind of similar to a storage array using loops to connect to their backend disks, which I did mention.
Apr
13
revised Howto check disk I/O utilisation per process
deleted 1 characters in body; edited tags; edited title
Apr
13
revised iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?
edited tags
Apr
13
comment Can NetApp Snapshots be used as Backups?
You often take backups of things that aren't mirrored. Nonprod environments, for example. They take a long time to rebuild, but won't bring the business down if you lose them.