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5

If you can afford it, a centralized storage system is ideal for safely and reliably serving your company's data. That said, check your math- while it's fine to back servers and computers up to a NAS, it's almost never the best choice. Archives are also not optimal for a NAS. Archives and backups are best put on something else like a tape drive or ...


4

You are using Software RAID -- there is no hardware controller backing that RAID. Software RAID is implemented in the Linux kernel. You can confirm it's status by looking at /proc/mdstat cat /proc/mdstat


4

I think you're asking for a way to turn your Dell Equallogic storage into shared network storage; e.g. converting SAN to NAS. The Equallogic SAN is block-only, so your easiest solution is to configure a server to interface with the Equallogic device over iSCSI. Use that server to present the block storage to the rest of your network as a network filesystem. ...


4

The contents of /proc/diskstats, and the output of 'iostat' on it's own, both show the cumulative stats since the counters were reset (probably since the machine booted). If your webserver is serving primarily HTML and simple SQL, it's very likely it's mostly coming out of memory caches, and so very little is hitting the disk for a read. On the other hand, ...


3

For 200TB, yes you want an array. However you're thinking in the wrong direction if you're trying to square off SAN vs. NAS. They're different tools for different jobs. NAS is network accessible - typically delivering NFS or CIFS storage, sometimes iSCSI. (And sometimes FCOE). SAN typically means a fiber channel network providing block storage over SCSI ...


2

For the amount of data, see iostat: [root@example ~]# iostat -m Linux 2.6.32-431.11.2.el6.x86_64 (example.com) 08/08/2014 _x86_64_ (2 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.38 0.00 4.10 0.36 0.10 95.07 Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn sda 0.95 ...


2

The XP is really a rebranded Hitachi USP-V. Performance Advisor is not a Hitachi tool, though, and while it can get some basic numbers, the presets aren't that useful, and there's only so far that tool can take you. There is a performance extraction tool that you can run on Hitachi machines, but the data from it is very hard to parse. It is badly described ...


2

You're expecting a JBOD, but it appears that this might be set up as a SAN, and you're seeing LUNs. You should check the 6140s themselves.


2

I'd probably just compare fdisk -l and lsscsi. On my systems, I tend to see more output in fdisk, as lsscsi doesn't account for all of the block devices in use on the servers (ZFS zpool devices, etc.) Similar situation for blkid.


1

This depends on your server, the backplane and whether an expander is involved. If you are connecting to the disks without a backplane or expander solution, you will need the 8i card and SAS breakout cables. Edit: You don't have an expander backplane, so you'll need an 8i (2 x SFF-8087 ports) controller and two SAS breakout cables. Please see: How ...


1

Some years ago I started writing a storage system similar to ceph. Then I discovered ceph and what they had worked better so I dumped my development. During the development process I asked a similar question to yours but on SA I did a lot of calculation on handling lots of small files and found that naming files (assuming they can be anything) by uuid and ...


1

You don't provide the Windows version that you will use. I really recommend using 2012 R2 to get all new feature from NTFS, like hot repair. Your 3 nightmares will be: -Fragmentation -Time taken to do a chkdsk. The time of it is based on number of files, not size. -backup time If you are at least on Windows 2012, you should look at ReFS. This new file ...


1

Seems that it's a replication issue as you have replicated the storage , not sure just verify if you have any other host and attache the storage initiator there and check.


1

Apparently, if you set cache=NONE for a disk image file on any host filesystem that does not support Direct IO, Virt-Manager will currently give a not very helpful error message saying "Something something... Invalid Argument" and refuse to start the Guest VM. One example of such a filesystem --that does not support Direct IO-- is the tmpfs. Another such ...


1

When you see disk space being consumed but the files consuming it are not visible in the file system, it usually means the files are being kept open by a running process. The space will be freed once the process is terminated. Rebooting is one way of terminating processes, which is why the space is freed on reboot. You can use lsof to look for processes ...


1

Is it possible to do it in a standalone server Yes, but you don't talk about performance/load requirements, that said I'd pop in a bit more memory if you can, it's cheap enough these days.


1

If you're running powershell 4.0 check our Grant/Revoke-SMBShareAccess http://technet.microsoft.com/en-us/library/jj635705.aspx However, PS4 requires a Win8.1 or Server2012 R2 or later client OS to run. Earlier versions of PS did not have native cmdlets for share ACL modification. I've had good luck with SUBINACL.EXE you can download here ...


1

I'm pretty sure that you're correct - what RAID scrubbing does is read back your stripes and recalculate your checksums, and in this way check for media errors. So if your array is already handling it, then it's moot. Perhaps to the point where if the NetApp thinks it's got a RAID-0, I'm not sure if it actually can be doing anything - there's nothing ...


1

I'd stick with mainstream filesystems like XFS (as promoted by Red Hat) and rely on ZFS for advanced filesystem needs. This is mainly due to: Mindshare: ZFS knowledge is held in the Linux, FreeBSD and Solaris/OpenIndiana communities. Maturity: The ZFS codebase is proven and has been around for awhile. Best-practices have evolved and I can't recall seeing ...



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