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UNIX noob, enterprise storage expert


Mar
12
comment Why is RAID 1+6 not a more common layout?
I've (briefly) configured something like a raid 6+1- a Netapp local syncmirror will create an identical copy of itself and multiplex reads across both plexes, while mirroring writes. It's mostly used for migrating Netapp V-Series to new backend LUNs, however if I wanted to double my reliability, I could do that with this.
Mar
9
comment Storage tiering and SLA models
It can be, especially with SSD making two workloads on the same hardware bottleneck at two completely different levels. You can get a blurry number by measuring latency under various types of loads. Alternatively, you can apply a number that's definitely way lower than the box is capable of spiking to but high enough for your clients. And when your phone rings, you'll be guaranteed it's because someone's hitting their QOS limit, not a box limit.
Mar
9
comment Storage tiering and SLA models
The benefit is that it prevents one app from making everyone else's latency higher. I would almost recommend capping all workload to maybe 75% what the box can do, just to ensure that spikes never hit anyone else.
Mar
7
comment Storage tiering and SLA models
QOS, at least on Netapp, works the other way. It limits performance, but doesn't guarantee it.
Feb
26
comment FC-Multipath: Which path_selector performs best?
The difference may not even be attributable to the multipath setup.
Feb
24
comment NetApp filer - lots of 'low water mark' CPs triggering on idle filer
Lucky you! What firmware level? I run those two as well...
Feb
10
comment One SAN connecting to Hyper-V and VMware
Nope, not something I have experience with.
Jan
23
comment default NTFS permissions on NetApp CIFS share
Right click the volume, edit, and check whether it's set to Unix. If so, change it to NTFS.
Jan
16
comment Show IO on Netapp
Netapp has 2 operating systems- clustered data ontap and 7-mode data ontap. They're fundamentally different, and the answer for one will not be the answer for the other.
Jan
16
comment Show IO on Netapp
It would be helpful if you could tell us whether you're using 7-mode or CDOT.
Jan
14
comment default NTFS permissions on NetApp CIFS share
Can you check whether the volume is set to NTFS security style?
Jan
12
comment NetApp filer - lots of 'low water mark' CPs triggering on idle filer
Is this in production yet? If so, there's a special option on the netapp support line that may put you through faster.
Jan
8
comment NetApp filer - lots of 'low water mark' CPs triggering on idle filer
yes, you'll probably end up setting up a diag elevated session and running something like mem_stats, but it's not well documented publicly and, as far as I know, can actually cause trouble if not used properly. Once you get a call back, don't let them remote into the box, insist that they walk you through it. And then take notes and ask questions :)
Dec
30
comment How do you properly do Disaster Recovery for a file server?
Yeah, backups are definitely part of a good DR plan, but they're also supposed to be taken for granted. All sites, even without DR, should have reliable backups. I answered the question assuming that that's already the case :)
Dec
30
comment Best practices in connecting EMC VNX iSCSI storage
I took out the part about the xen server- that's something that belongs in its own question. I condensed the rest of it to the actual question, and I think this is very answerable now.
Dec
30
comment Best practices in connecting EMC VNX iSCSI storage
I think that a slight rewording would make this a single question with a single non-opinion based answer, @PeterHorvath. I'll give it a whirl.
Dec
30
comment How do you properly do Disaster Recovery for a file server?
VSS is essentially snapshots. That is more of a backup/restore technology than a DR technology. DR normally refers to getting back online after the loss of a site. If it's being expanded to include things like data corruption, I'd have to put something more in about backups.
Dec
17
comment Premature SMB/CIFS Session Close (System error 1312) with Password on SMBv2
I'm not putting this in an answer because it's a cop-out, but this problem is specific enough that you should probably open a case with Netapp.
Dec
17
comment Access a share on a server using another servername
You can make all the old top level folders top level folders on the new storage, is what I'm saying. So if your old storage included \\B\sales, you could create a "sales" share on \\A\ and make the old IP address for B point to it.
Dec
16
comment Premature SMB/CIFS Session Close (System error 1312) with Password on SMBv2
Also, if it's a double hop issue, you might want to check this link: ravichaganti.com/blog/…