Primarily questions about disk storage, sometimes questions about application storage or cloud storage. Always questions about storing data.

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2answers
301 views

How to migrate a ZFS filesystem to use compression?

Question at the bottom. I have several ZFS file system I would like to use ZFS compression, but since enabling the compression will only affect new data written to the file system, I would like to ...
1
vote
0answers
79 views

10K SATA vs 10K SAS - SBS Server Upgrade [closed]

We are upgrading the storage on a SBS2011 server. It currently has a single 7,200RPM SATA drive (don't know the model). Small office with less than 10 users. Budget is low so the original plan was to ...
3
votes
1answer
221 views

Hyper V 2012 and SQL Cluster Live migration

I've been doing allot of searching and even asked around here at the office without a good answer. I would like to know, within Server 2012 R2 Hyper V, can you or can not do a storage migration of a ...
2
votes
1answer
42 views

Abstract physical drives to create a resizable raid array: is it possible?

I want to set up two hard drives with a portion of them set in raid1. I want that portion to be scalable too, as logical LVM volumes are. Is it possible to abstract physical volumes or to create an ...
1
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1answer
62 views

Access a share on a server using another servername

We've recently moved to a new office, and merged our network with a bigger one (Trust between our domains), and now we are using the storage box of the bigger network. This poses a problem for me: My ...
2
votes
1answer
125 views

SCSI disks capped at 40 MB/s

I have a batch of SCSI disks and a controller; the drives are HP 72,8GB 10k RPM Ultra320 SCSI (model number BD07296B44), the controller is an Adaptec AIC-7892A U160/m, the issue is that I can't get ...
-1
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2answers
84 views

Parallel disk seek with JBOD

I'm looking to build a 80 TB file based storage system. Ideally, I'd like to do this with a large JBOD and one server with a lot of cores. My question is: Will JBOD containers (like Intel's) allow ...
1
vote
1answer
371 views

Unable to ping between ESXi host and Netapp storage on the same switch

I am unable to ping between ESXi host and Netapp controller that are both connected on the same switch and configured for private IP addresses. Yet I CAN ping between 2 Esxi hosts and between 2 ...
3
votes
2answers
131 views

FC-Multipath: Which path_selector performs best?

So I learned that since Red Hat 6 it is possible to choose between 3 algorithms for loadbalancing between different paths to my FC-SAN, the default dumb round-robin - and new - queue-length and ...
16
votes
2answers
1k views

Is running permanently in a VMWare snapshot bad for performance?

I understand that the VMWare KB frowns upon long running snapshots mainly due to two things (In my opinion) Taking tons of snapshots can fill up the data store. Snapshots are simply delta files. ...
0
votes
1answer
56 views

IBM Fiber Storage

I am asking this question on behalf of the company i work for, What the problem is that we have just setup a fiber storage system with an IBM Server and IBM Fiber Storage system, we brought the both ...
3
votes
1answer
2k views

Adding a local HDD to an ESXi host

I am trying to add a 4TB HDD to my ESXi server, but I can't find out how. I've tried following a few tutorials on the internet, which say to go to the configuration tab, storage, rescan the datastores ...
1
vote
3answers
271 views

Long running VMWare snapshots are bad… but what about VMDKs on a ZFS\LVM snapshot?

The VMWare KB and multiple blogs state that long running snapshots are bad for both performance reasons and integrity. They have valid points. Granted this is not with ESXi but rather ...
2
votes
1answer
151 views

Using a JBOD for redundant NFS

I have a Xyratex sp-2224 JBOD enclosure (dual controller) and a pair of Dell servers with SAS HBAs installed that I'm looking to utilize in a redundant NFS cluster. The hardware isn't what I'm ...
0
votes
0answers
204 views

Server 2012R2 DFS High Availability - with local storage?

Can I use clustering for high availability on two identical 2012R2 boxes that use LOCAL storage (not attached or SAN)? Local storage is super cheap and scalable, which is why the SAN has been ...
0
votes
0answers
37 views

Invisible (!) data on NAS machine

I am running a Thecus N7510 NAS machine, with 4 HDD in a RAID 10 configuration and one more as a "hot stand by". This machine is used for a variety of purposes, excluding backup up until now. Lately ...
2
votes
1answer
82 views

VMware VMFS5 Local Storage LUN Sizing

We have a VM ESXi 5.x host using local storage (DAS). It has 2 relatively large Logical Drives in RAID10 (10 HDD x1TB each). So, 2 LUNs of 5TB each. We are considering creating just two ...
4
votes
1answer
330 views

HP StoreEasy 1630 Pool Expansion

We have a single HP StoreEasy 1630 with the following disk configuration: Pools RAID Drives Capacity Virtual_Disks Physical_Disks Size_Per_Disk A 1 2 450GB 1 ...
4
votes
2answers
583 views

SAS Expander backplane performance drops when more than 8 drives are active?

We are using an LSI 9211-8i raid controller (flashed in IT mode) in a PCI-e 2.0 x8 slot. It's connected to a supermicro SAS 836EL1 backplane with 1 SFF-8087 cable. We have 16 drives installed. When ...
3
votes
2answers
523 views

Hardware mods: kludging a conversion from U320 SCSI to SAS/SATA

I apologise if this isn't an appropriate question for this forum. I've an elderly server that works well and that I'd therefore prefer not to scrap entirely. But I would like to replace the current ...
2
votes
2answers
219 views

NetApp RAID DP - and disk space of parity drives

I've been reading: http://community.netapp.com/t5/Tech-OnTap-Articles/Back-to-Basics-RAID-DP/ta-p/86123 That basically describes RAID-DP as diagonal parity raid. But there's one thing that's ...
4
votes
2answers
432 views

Joining a NetApp to a domain on a Read Only Domain Controller

I have an isolated network, into which I've built a vfiler. The point of this network is that it's a non routed 'test' network. However, there's a need for LDAP/Kerberos and CIFS access to the ...
1
vote
1answer
160 views

HP ProLiant dl360 G4 with external backup

We are running a HP Proliant DL360 G4 with external HP Storageworks Ultrium 960 tape drive attached at the moment. Unfortunately the tape drive failed over the weekend and we are looking to upgrade ...
2
votes
1answer
160 views

How to find out if lvm mirror write is asynchronous or synchronous?

I am using redhat 5.8 with an lvm mirror, created with the following command: lvcreate -m1 --mirrorlog mirrored -n mirrorvol -L 10G myvg /dev/vdb /dev/vdc I would like to know, when I write, do I ...
1
vote
1answer
114 views

Management for Netapp filers and vFilers

How can I manage the system files on a filer or vFiler in Netapp? There are a couple of really important system files in every filer that it's really only feasible to manage by hand. While there are ...
2
votes
1answer
145 views

How can I test my DR on Netapp without stopping replication?

I have two Netapp filers running ONTAP 7-mode with some volumes on the main one replicated to the secondary one on another site. I need to regularly test my DR, but I can't break the replication ...
1
vote
1answer
102 views

Installing boot manager to a raw LVM physical volume

Is it possible to install some boot manager to disk with raw physical volume inside (i.e. no partition table)? I tried LILO and LVM volumes became inaccessible (due to LVM structures corruption). Boot ...
1
vote
1answer
1k views

Limit on number of raid arrays in a HP P420i

On the spec sheet of P420i HP raid controller, it says the maximum number of logical drives is 64 with 512 mb cache or above. But what is the limit of the number of arrays one can create. For ...
0
votes
1answer
93 views

Max Size of Disks Supported by Controller

I am interested in purchasing (second hand) a Dell Poweredge 2950 2nd Gen server. However, the specs say it has a max storage size of 4.5tb. I am wondering if this means just what is available to ...
-1
votes
2answers
56 views

How to expand memory on a virtual machine? [closed]

So I know that this question has been asked before, but this is a bit different and I believe it needs to be solved differently. This office has a machine on their local network that runs a host of ...
1
vote
2answers
743 views

iscsi with multiple lun, how linux to connect only selected lun

My 10.1.1.100 have 10 Targets. I'm initially connected to single Target by running iscsiadm --mode node --targetname iqn.2005-06.com.drobo:b800i.1112.id5 --portal 10.1.1.100:3260 --login It only ...
36
votes
10answers
4k views

Linux on VMware - why use partitioning?

When installing Linux VMs in a virtualized environment (ESXi in my case), are there any compelling reasons to partition the disks (when using ext4) rather than just adding separate disks for each ...
2
votes
1answer
134 views

Is RAID50 OK for a fileserver?

We have a new storage array consisting of 24 x 600GB 10K SAS disks arriving next week, and I'm trying to decide how best to carve up the available space for our 3-node VMware vSphere cluster which ...
2
votes
1answer
1k views

Force RAID 1+0 HP Smart Array to rebuild

I have a RAID10 with status "Ready for Rebuild", but how can I force the rebuild? # hpacucli ctrl all show config Smart Array E200 in Slot 0 (Embedded) (sn: PA6C90N9SW82IU) array A (SAS, ...
0
votes
3answers
116 views

ESX SAN overbooked, what happens if storage limit reached?

In ESX you can easily overbook the available storage with the Virtual Guests. What happens if a overbooked SAN reaches its capacity limit? Its not an actual problem i'm faced with, we just had the ...
0
votes
0answers
107 views

Local storage for Server 2012 file share under ESXi

I have an ESXi 5.5 server with two local disks, one is 300GB and the other is 2TB. The configuration is for a small organization that will have two Windows 2012 servers - one Domain Controller and the ...
2
votes
1answer
2k views

How to upgrade the firmware of HP SAS expander card without Smart Array controller or Proliant Server?

How can I update/upgrade/flash the firmware of an HP SAS expander card [468406-B21 a.k.a. 487738-001]? I used to do this using Windows and a HP P410 Smart Array controller, however that controller is ...
4
votes
2answers
5k views

Slow disk performance on Azure Virtual Machine

Okay, so first of all, allow me to say that I'm not an operations person, but a developer. So I'm going into a bit of unknown land here, so please bear with me. I would like to use a Azure Virtual ...
2
votes
1answer
362 views

Operational State Down on QLogic Switch

I have a QLogic SANbox 5800 Fibre Channel Switch with 20 SFP ports. Out of these 20, I can use only 16. The last 4 ports are showing Operational State Down. SANbox (admin) #> show port ...
1
vote
2answers
137 views

NetApp ipspace with common vol0 exports

I've got a requirement to use vfilers and ipspaces to segregate network traffic to a NetApp filer in a multi-tenancy environment. Unfortunately, most of it has already been implemented and designed, ...
2
votes
1answer
83 views

“Hot data” and erasure coding: how to know if it is efficiently handled?

It is well known that erasure coding adds extra complexity because of encoding and decoding operations. Due to this drawback, most of cloud services recommend to use data replication for hot data and ...
-2
votes
2answers
54 views

parallel filesystem without SAN infrastructure

Is there any parallel filesystem that doesn't need SAN infrastructure ? What I want to do is to create a logical volume and attach it with multiple VMs that will use the disk concurrently.I don't want ...
0
votes
2answers
416 views

NetApp FAS 3020c, volume is full

We've noticed a problem with one of our volumes on netapp filer. It seems that volume is full, NetApp informs, that volume is using or reserving 100% of space (0% of inodes) - this is shown as the ...
0
votes
1answer
235 views

Expanding NetApp volume via spare disks

I am somewhat new to NetApp, so please bear with me. I have a NetApp appliance that I was told has spare disks. How do I: Determine how many spare disks I have available? I have tried "disk show", ...
0
votes
1answer
158 views

Unclaimed disk space but no actual physical disk present

I am working with Ubuntu server 12.04 and earlier this week we detected a bad disk in /dev/sdl. I was not able to query its mount point and it also had failed SMART tests. Today I brought a brand new ...
2
votes
1answer
1k views

No LUNs visible on ESXi 5.5 using Brocade 825 connected to EMC VNX 5300

We've just bought a new Dell PowerEdge R620 to replace the oldest of our 3 hosts in our vSphere cluster. The existing hosts are connected to our EMC VNX 5300 SAN using gigabit ethernet which is a ...
3
votes
1answer
738 views

Is there any downtime when expanding a volume on an iSCSI setup using Synology Hybrid RAID?

The subject sums up the scenario. I believe the answer is there is no downtime but the system might simply be slower during the rebuild. Which is fine. But if there is downtime, how long? A small blip ...
3
votes
1answer
2k views

What is the maximum drive size compatible with the H700 Raid controller for Dell Servers?

I am thinking of stuffing twelve 6 TB drives on my R510 server. I know the latest firmware for the H700 controller support more than 2 TB. However, there is no clear documentation on what is the ...
2
votes
0answers
47 views

Maximum size of a virtual pool in SCVMM 2012R2

I have a Windows Server 2012 R2 running SCVMM 2012 R2 and an over-committed virtual storage pool. In Server Manager the capacity of this storage pool is 128TB which translates to 140TiB which makes ...
6
votes
1answer
1k views

Replace HP Smart Array E200i without losing data

I've got a Smart Array 200i which seems to have some bad slots (slot 3 and slot 5). It doesn't matter what HD I put in these slots, it keeps telling me the drive is bad. My question is two-fold: Is ...