23
votes
Linux goes to swap while plenty of RAM installed
There is no problem. Even if there is still available RAM, the Linux Kernel will move memory pages which are hardly ever used into swap space.
It’s good to swap out memory pages that have been ...
- 3,096
15
votes
Accepted
iSCSI, multiple initiators for the same LUN
You need to have some sort of either a clustered file system or distributed lock manager to avoid metadata damage done to your file system with concurrent writes.
There's a good summary of this ...
- 13.8k
12
votes
Accepted
Can you connect a SAN directly to a HBA with Fibre Channel?
You can use multipath FC connections from your servers to the MSA2040 without the use of a switch.
You would connect your HBAs on thee servers to each of the two controllers on the MSA. The MSA2040 ...
- 198k
12
votes
How to get free space from mounted drive Redhat 7
I try to do the same thing couple week ago and I don't find how to. I share the official statement on the Redhat support portal.
It is currently not possible to reduce the size of a partition or ...
- 121
12
votes
Accepted
How to get free space from mounted drive Redhat 7
Being able to run fstrim on the / partitions would be the best solution however with they way your ESXi is configured it would not be possible.
You need to be able to enable discards on both the VM ...
- 709
10
votes
I want a file search like 'Everything' for network shares
Actually, Everything Search can search on the network, but you have to create a file list yourself.
Go to Tools -> File List Editor
Click Edit -> Add folder --> here, select a shared folder on the ...
- 211
10
votes
Accepted
Using non-certified hard drives in Dell MD3220 storage array
I found a tutorial. Please read Flash Dell Firmware into Seagate Generic Drives.
The procedure should be the same for your Toshiba drive as the same tools are used.
Dell download page: Toshiba SAS ...
- 2,049
9
votes
Mixing HBAs in a failover cluster?
You don't really mention enough detail at all but I'd have zero concerns about mixing Emulex and QLogic - in fact in our highest-availability systems I consciously do this kind of thing, even with ...
- 102k
9
votes
Accepted
Can I dynamically expose an entire SCSI host over Fibre Channel, preferably in Linux
Sure you can do that. Good summary is here:
https://forum.level1techs.com/t/fedora-diy-fc-san/122877
Some good play with SCST instead of a default LIO is here (uses QLogic HBAs):
http://scst....
- 13.8k
8
votes
Accepted
EMC ScaleIO vs Starwind Virtual SAN
There's no good or bad here: both ref'd solutions are just very different in the way how they scale out, how they distribute data among cluster nodes and how they handle component failures.
1) Wide ...
- 13.8k
8
votes
What differences are between a NAS, a shared disk file system on a SAN, and a distributed filesystem?
Nowadays the border between NAS and SAN is unclear especially for SMB products.
Historically NAS devices consist of the bunch of disks arranged in some RAID to maximize the overall performance and ...
- 9,066
8
votes
How does SAN provides block access to data?
Block access in SAN means, that VM (or hypervisor) have raw access to storage over network without any file system. It looks like raw local attached storage (DAS). Depending on SAN configuration the ...
- 9,066
7
votes
Accepted
How do I connect a disk array?
This particular "shelf" is an SAS (Serial Attached SCSI) drive array. SAS is like the SATA connection used in consumer computers for connecting hard drives, but more robust. Once of the things that it ...
- 23.1k
7
votes
Migrating from AWS EBS to Co-Lo hosted SAN/NAS
SAN/NAS for < $3,600 per TB?
This is totally doable. However, don't forget that apart from SAN hardware/software itself, there are lots of things that should be considered, such as: redundant ...
- 5,080
7
votes
Accepted
Nano Server attached to SAN doesn't see new files
NTFS is not a cluster-aware file system. It was never designed to support simultaneous access from different clients.
In order to allow multiple access: configure MPIO, deploy the Failover Cluster ...
- 5,080
7
votes
Accepted
Mapping SAN to cluster nodes
Oh god, you've not have you? You've just caused immediate, irretrievable data loss sorry.
NTFS isn't a cluster-aware file system, you need something to act as a lock manager too.
MS Cluster Services ...
- 102k
7
votes
How to configure StarWind Virtual SAN Free
First off, get rid of NIC teams for your storage and synchronization networks. ISCSI networks leverage MPIO, there is no need for trunking, teaming, bonding, etc. Also, don't forget to enable MPIO in ...
- 6,189
7
votes
Accepted
PAGE_FAULT_IN_NONPAGED_AREA when booting Windows 10 from iSCSI network drive
This appears to happen when the system page file is located on the iSCSI device. While locating the page file on iSCSI worked fine under Windows 7, it appears to be broken in Windows 10. Unfortunately,...
- 251
7
votes
Boot Windows from SAN
Booting from SAN is pretty rare these days. The hypervisors I tend to see are booted from SD cards. You can then have 100% of your local storage for VMs, or use the SAN exclusively for VMs. It's also ...
- 69k
7
votes
Accepted
"Bad message" with a new SAN using multipath and iSCSI
That is normal behavior for a non-clustered file system.
To use iSCSI SAN with Ubuntu compute servers, a clustered file system should be used.
You should probably learn more about GPFS, GFS2, Lustre, ...
- 1,484
6
votes
Accepted
Fiber Channel (8 Gb) or iSCSI 10 Gb
iSCSI will be fine here, especially since you already have so much of the infrastructure for it. While fiber would be less susceptible to interference, a 2Gb/s difference is enough to make up for that ...
- 7,086
6
votes
Accepted
How to connect two Dell storage arrays to a to a Dell Poweredge server (daisy chain vs direct)?
You can stack the MD unit that way; (In the image its 3 MD, but you can see how)
For your openmanage question, yes, it can be used remotly, but be sure to set the routing correctly in the management ...
- 16.9k
6
votes
Miserable performance of Hyper-V storage on CSV
If you use Broadcom NICs, try to disable VMQ on a virtual switches and on a physical network adapters: http://www.dell.com/support/article/ua/ru/uabsdt1/SLN132131/EN
You might also check if there are ...
- 9,066
6
votes
Accepted
diffrence between virtual machine storage and san storage
When it comes to performance delta between a VM-based server comparing to a bare-metal one, it’s clear the performance of bare-metal solution should be better, since it has literally fewer abstraction ...
- 3,918
6
votes
Windows 10 iSCSI Boot
I can suggest you two options.
First option is to use Linux gPXE. It is PXE client implementation and bootloader derived from Ethernet. I’ve heard about this solution a couple of times already, but ...
- 5,570
6
votes
EMC ScaleIO vs Starwind Virtual SAN
The short answer is: both solutions will meet your requirements.
As already mentioned by the previous poster, they just work in a different way.
If you'd like to know about benefits / drawbacks of ...
- 5,080
6
votes
Windows 2012 R2 Hyper-V SAN Configuration
Unless you're planning to do sort of a failover cluster with a pass-thru disks (and you're unlikely...) you need to wrap a Cluster Shared Volume (CSV) on top of your shared LUN.
Use Cluster Shared ...
- 13.8k
6
votes
Am I doing this wrong? Networking - High Availability: SAN, MSFT Failover Cluster, NIC Teaming
(1) Storage. QNAP would make a decent backup target, say used over iSCSI with Veeam, but it's quite a poor choice in terms of the primary storage. Performance isn't great, but the worst part is... It'...
- 1,062
5
votes
Accepted
Can increased disk throughput increase CPU utilization?
It certainly can. A definitive answer to the question of whether your CPU has gone up because of this would require more information, but in general, this is quite common and easily explainable.
...
- 8,851
5
votes
Accepted
SAN - NFS and CIFS
1) SANs are all about blocks so these are iSCSI, Fibre Channel, and FCoE. But you can hardly find "true" or "pure" SANs these days maybe only Nimble and Equallogic who can't do also NAS protocols like ...
- 13.8k
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