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UNIX noob, enterprise storage expert


Mar
27
comment HP P4000 / Lefthand : how to do a manual failover
Haha, a "feature". That's cute.
Jan
28
comment What would cause IO Wait on a SAN?
Which array? What management software, and what's the exact message?
Jan
28
comment What would cause IO Wait on a SAN?
I think I may have answered the wrong question- you're saying your SAN is complaining about wait time? Is it saying that it thinks its hosts are waiting too long to get answers to their IO?
Jan
14
comment How does tape backup affect production systems such as SQL Server
The entire guide that he linked is for production systems...
Jan
14
comment How does tape backup affect production systems such as SQL Server
The effect of backing up a production system will be that the production system is copied to another storage media. What are you fishing for here?
Jan
7
comment NetApp Flex Volumes (Flexible Volumes)
You'll need admin credentials to make any changes to your netapp. I'm editing the answer to account for the fact that this is a lun.
Dec
21
comment FlexClone splitting in Netapp OnTap 7
That's what we were trying to avoid- lots of writes.
Dec
4
comment Fine tuning iSCSI Initiator configuration in Windows Server 2008 R2
What type of iSCSI target? Is it some sort of storage device, or just another server? Is it capable of active/active multipathing?
Nov
27
comment Accident from tar -cvf, recover original file?
Do you take backups?
Nov
19
comment Connectivity issues when setting guest MAC to the same as the host MAC on ESXi 5
No, it's fully correct.
Nov
15
comment In storage virtualization, what is the difference between auto load balancing and auto-tiering?
Be aware of load balancing for paths- each vendor will have a best practices guide that should be followed, and sometimes have limitations on the supported configurations. If you decided to put all your hosts across all your ports on, for example, a VSP, you'd be limited to 2000 volumes. Each port can only support 2000 unique LDEVs. That said, every additional port you provide is an additional SCSI queue that can be used by the host which may increase performance.
Nov
5
comment Sparing level on HP EVA 4000
I was seeing 9 failures a month on my 450GB drives. I think I got a lemon.
Oct
23
comment EMC + erase LUNS from EMC storage by tool/script
You can use navicli to unpresent and delete volumes. Do you need to delete the data on them first?
Oct
12
comment While loop read multiple lines from a grep
fine, then your answer is too brief to be helpful, and I'll accept another one that lays it out easily for shell noobs.
Oct
12
comment While loop read multiple lines from a grep
Not at first glance- now that I've looked up what happens if you use square brackets with a condition and then a logical operand like && with an action after it, it's a little clearer, but certainly not something that someone at my level would understand at first glance. That said, I do understand it now, and if you want me to, I can add a longer explanation before the code.
Oct
12
comment While loop read multiple lines from a grep
You're correct, but there's not enough detail in here for a shell noob to really get at what you mean.
Oct
12
comment While loop read multiple lines from a grep
@poige The problem I was trying to solve is the title of the question. If, for example, there were a way to make a for loop parse lines of stdin into separate key variables, that would be an answer. The while loop is only in the subject of the question because it's the only way to do this, however has this limitation.
Oct
11
comment While loop read multiple lines from a grep
Also, this problem comes up when you have to switch from a for loop to a while read loop because of multiple variables.
Oct
3
comment Asynchronous Replication vs. Mirroring
Yes, consistency is done on a group level. On my USP-V, we have most of our AIX environment in the same journal group.
Sep
26
comment What buffer size should I use to maximize disk I/O bandwidth? (16Kb, 32Kb, 64Kb, etc.)
Ask your sysadmin.