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11

I'd say the main advantage is ease of configuration - using something that's specifically designed for the role of a NAS server, as opposed to an all-around Linux distro. FreeNAS and OpenFiler also have features within easy reach that stock Ubuntu doesn't.


10

My current recommendation is NexentaStor, available in a free community-supported edition and as a commercial offering. Also see: Anybody have experience with using Nexenta? NexentaStor CE or Openfiler? Which do you recommend?


10

FreeBSD 8.2, running ZFS. ZFS includes the following out of the box: Supports NFS & iSCSI out of the box. ZFS includes Snapshots, data checksums, multiple copies, filesystem compression RAID-Z - Similar to RAID-5, but without the RAID-5 write hole. All disk writes are atomic copy-on-write transactions, so the on-disk state is never inconsistent (No ...


9

There's no software RAID option for the setup you've described. VMware won't support it. If your hosts were Linux/Windows, you'd have some additional options. If your concern is system stability, you could have used RAID 1+0 and/or designated hot-spare drives in your setup. If performance isn't a concern (e.g. the use of RAID6), why worry about the ...


7

Just a couple of quick notes after spending a fair amount of time with Openfiler in a cluster setup and 8Tb of storage: The 2Tb limit is most likely because you're using MBR (Master Boot Record - Openfiler called it MSDOS, even though that isn't really correct) partitioning, rather than GPT (GUID Partition Table). MBR is limited to 2Tb partitions. See ...


7

Outside of OpenFiler, your options would be other NAS OSes (FreeNAS, NASLite...), dedicated NAS appliances running custom software or completely rolling your own with a mainstream linux distribution (or Windows if you really want). I have been experimenting with FreeNAS and OpenFiler for the past month or so. I am putting my eggs in the OpenFiler basket. I ...


7

The default readahead settings for LVM are really pessimistic. Try blockdev --setra 8192 /dev/vg1/vol1 and see what that bumps your LVM performance up to. You will always take a performance hit using LVM; we measure it on properly configured systems at about 10% of underlying block device performance.


7

I build video/media servers for a living and while normally I'd be telling you to optimise the hell out of every part of your system (by ensuring you have as clear a path from disk to NIC as possible, meaning a change of disk subsystem to match your disks) in this case you've missed out the most important piece of information - your uplink speed. You don't ...


7

A quick note about Openfiler (and I hear NexentaStor is the same) when used as an iSCSI target - you are almost guaranteed to see timeout errors and targets dropping offline, requiring a reboot of the server to correct. This usually happens under heavy load (though I've seen it happen under light loads, too). We went through hell with Openfiler using iSCSI ...


5

A Comparison FreeNAS vs OpenFiler, If you are big business, and don’t have the internal resources to setup and manage a SAN, Xinit Systems has different support services for you. But don’t forget that the FreeNAS developers will also welcome your business, and will gladly (I’m sure) help you setup a FreeNAS-based SAN. If you are a home user and just ...


5

No, you can't use a LUN larger than 2TB (minus 512 bytes) with VMware, VMFS or RDM. http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=3371739 Try looking at the raid controller in your server and see if you can create logical disks. This way you could put all the 6 disks in a RAID5 (giving you 2,5TB ...


5

There seems to be more momentum behind NexentaStor. You haven't provided much detail on the hardware arrangement other than it being old. What are the CPU/RAM numbers? However, one reason I'd go the NexentaStor route is the presence of inline compression of its storage volumes. Your setup probably isn't suitable for the deduplication features, but the ...


5

You didn't provide the version of CentOS installed as your VMWare guest... but let's assume it's CentOS 6.x. The default CFQ I/O scheduler is a poor choice for guest virtual machines (and most systems). You'll want to modify it. I used to just recommend setting the scheduler to deadline, but there's an easier method now for RHEL/CentOS systems... The best ...


3

I don't have a direct answer for you, but how often is your SBS down? If this is a frequent occurrence, you should: 1. Remediate the reason for the frequent downtime 2. Install a second DC. I understand that SBS will allow additional DCs in the domain, they just can't hold any of the FSMO roles. In small offices, I've often seen the second DC installed on ...


3

FreeNAS is based on m0n0wall which I use a lot so it would normally be my first choice. However, I chose Openfiler for the AD integration and the fact that I can SSH into the box and play on a Linux kernel. I am not comfortable with FreeBSD which FreeNAS runs on. So far Openfiler has been great. I have both NFS and SMB/CIFS shares with the SMB shares using ...


3

I don't have a good explanation, but I can confirm the results. Testing of RAID (raid5, 4x1.5TB drives) root@enterprise:# hdparm -tT /dev/md2 /dev/md2: Timing cached reads: 2130 MB in 2.00 seconds = 1065.81 MB/sec Timing buffered disk reads: 358 MB in 3.00 seconds = 119.15 MB/sec root@enterprise:# hdparm -tT /dev/md2 /dev/md2: Timing cached reads: ...


3

UFS2 read only support is included into linux kernel since version 2.6.5. For example: mount -t ufs -o ufstype=ufs2 -o ro /dev/hda3 /mnt/bsd/ You still need an extra HDD to copy data from UFS drive.


3

GlusterFS may be another option: http://www.gluster.org/ Gluster was designed from the ground-up to be a distributed filesystem.


3

If you're just doing this on a regular desktop, it's probably because the drives are not hot-swappable. Removing or adding hard drives to a system when one or the other does not support hot-swap is a sure way to destroy the system and/or the drive.


3

Flat out, SATA I still outperforms 1 gigabit Ethernet, so that shouldn't be a problem for you. Whether or not you reach I/O saturation will depend on actual performance and usage patterns of course. If you start trunking/teaming multiple GbE cards you may end up noticing the reduced speeds, though.


3

This is a very open-ended question, so what works for one person might not work for you. I personally would go with an (Open)Solaris type install using either NexentaStor or OpenIndiana/Solaris Express with Napp-IT web UI management interface. FreeNAS is nice, but it's based on freebsd & it's version of ZFS is several versions behind Solaris. I have ...


3

If you plan to continue using your Hardware RAID, you should be aware that ZFS (on Nexenta) really needs direct access to the single disks in order to be fully operational. CIFS is somewhat limited on Nexenta CE as it currently can't work with LDAP users for access control, this only works with NFS. For CIFS, you need to create local users on the Nexenta ...


2

Linux should be able to mount UFS easily as read-only. Try modprobe ufs2 if it has trouble mounting it. What distro are you using?


2

My understanding is that OpenFiler is based on the CentOS/RedHat family of OS builds. Linux's nfs server isn't the best to begin with*, and CentOS/RedHat's is worse than average. *= when compared to NetApp filers, *bsd, or Solaris servers. (Wonders if I'm going to get down-modded for that.)


2

I would think hard about using sync. I'm reminded about the Dirty Harry 'Do you feel lucky' speech. NFS v2 and v3 is designed such that when the write is acked from the server to the client the data is on disk. This allows NFS to be stateless, and, therefore, the server COULD reboot between each request. One hopes not, but it could happen. This means ...


2

I know you're looking for software raid, but I do highly recommend Adaptec SAS HBAs like the SAS-2405. Adaptec works with the FreeBSD community to support their drivers too (FreeNAS is based on FreeBSD). And you can usually pick them up at a reasonable price on eBay. Good hardware RAID will usually beat the pants off software RAID, and may add hot-swap or ...


2

Make sure that you compare apples to apples. hdparm -t reads from the beginning of the device which is also the fastest part of your disk if you're giving it a whole disk (and it's spinning platters). Make sure you compare it with a LV from the beginning of the disk. To see the mapping use pvdisplay -m. (okay, granted, the difference in numbers may be ...


2

I just found the answer myself, just for anybody looking for it there is a KB Entry about that by Citrix http://support.citrix.com/article/CTX118735



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