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

learn more… | top users | synonyms

11
votes
8answers
15k views

Is it possible to hide lost+found?

Given a partition intended solely for storing music, video and so-on, is it possible to hide the lost+found directory?
145
votes
6answers
23k views

Are SSD drives as reliable as mechanical drives (2013)?

SSD drives have been around for several years now. But the issue of reliability still comes up. I guess this is a follow up from this question posted 4 years ago, and last updated in 2011. It's now ...
1
vote
3answers
2k views

IBM DS3400 - how replace a good disk

I've to replace all my disks with other bigger ones. I read in the manual: Never hot-swap a drive when its associated green activity LED is flashing. Hot-swap a drive only when its associated amber ...
1
vote
0answers
203 views

Docker no space left on device [closed]

I have a Fedora/couchdb image running on my home server for the purpose of storing data collected for research. However, I recently had a problem accessing the CouchDB interface and so I attempted to ...
2
votes
1answer
170 views

3PAR high service time overnight

I've a recently upgraded 3PAR array ( 3.2.1 MU1) , which overnight is getting some high iowaits - to the point where some paths to drop and servers to crash (particularly noticeable with e.g. Oracle). ...
0
votes
0answers
14 views

Best practices for sizing RAID 6 arrays? [duplicate]

I'm wondering what the best practices are for sizing raid 6 arrays. For example: At what point is it better to use multiple arrays or RAID 60? is spindle count the only factor? If reliability is ...
2
votes
0answers
87 views

Expanding JBOD with SAS extenders

My project is expanding 24-HDD ZFS box by adding 45-drive box with option to add another 45-drive box later (all are JBODs). Host box (24 HDDs) is Supermicro with single port expander backplane and ...
8
votes
6answers
34k views

SATA drives in HP ProLiant server?

Does anyone know if I can install normal 2.5" SATA drives inside an HP DL360 G5 server? Right now it has 6 72GB SAS drives. I am looking for raw storage for my files SAS performance in not required.
12
votes
2answers
6k views

Alternatives to Dell's mirrored SD card module for booting a small OS from flash?

Dell offers an add-on hardware card for some of their servers that provides a poor man's RAID1 between two SD cards (one card gets all the reads until it dies, writes are mirrored) for booting a ...
0
votes
0answers
19 views

RHEL 5 LVM: “dmsetup info” showing “Tables Present” as None

We have running a huge Live Setup on RHEL 5 and Storage LUNs configured on LVMs. Until recently the server is running fine but we have triggered a reboot over the machine for some maintenance purpose ...
-1
votes
2answers
118 views

vCenter Thin Provisioned disk usage calculations

I'm managing a number of Thin-Provisioned VMs in vCenter 5.1.0. Each contains one virtual Harddisk. We run a pretty tight ship in terms of allocating storage, so the difference between 1 or 2 GBs is ...
8
votes
2answers
11k 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 ...
0
votes
1answer
42 views

Finding out which is the failed drive on Intel SRCASRB RAID Controller

There is very old server with Intel RAID SRCASRB Controller with 4 x WD5003ABYX-0 500GB drives connected to it in RAID5 array. One of those drives has failed and I want to replace it. Since server is ...
1
vote
1answer
24 views

Distribute application as virtual machine but require external storage

I'd like to distribute a Web application as a VM image in order to make distribution, installation and maintenance as easy as possible for customers (virtual appliance). This image should include ...
5
votes
6answers
10k views

MegaRAID JBOD substitute

It seems that certain MegaRAID chips don't support JBOD (unfortunately). I've read online that to make these controllers act as a pass-through, I should configure the disks in RAID0. What RAID0 ...
0
votes
1answer
127 views

Windows Storage Server… Just a single Administrator session?

I have a server with "Windows Storage Server 2008 R2 Standard" operating system. My problem is that I cannot access the server with Administrator account with two users at the same time... Just one ...
2
votes
3answers
811 views

~50tb of storage in Azure presented as a single Windows File Share

I have googled, the closest thing I have found so far is another SF question here: Azure Storage limitations The Goal: Move approx 50TB of storage to the cloud, present that storage as a standard ...
4
votes
2answers
5k views

Choosing file system block size

Considering unix/linux/bsdunix specific file systems: How can I choose/know which block size to use while creating file system? Is there any specific block size value for a particular file system ...
4
votes
2answers
91 views

Can increased disk throughput increase CPU utilization?

We recently upgraded the storage in our data center and migrated all our production systems to it. We noticed that in one machine (an HP_UX IA-64 Oracle database server for SAP), the CPU utilization ...
2
votes
1answer
84 views

Make ceph minimize spread of file parts over OSDs

I am considering an option of ceph as distributed filesystem for my home-made MAID (massive array of idle drives). As far as I understand, Ceph oriented for cluster use and spread data evenly over ...
0
votes
0answers
22 views

How can I recover 'missing' storage on a non-system volume?

I have a Windows 2008 R2 server with several RAID-1 volumes. One of the volumes has a large amount, several hundred gigabytes (about 1/3rd of the volume) that is unaccounted for. WinDirStat shows it ...
0
votes
2answers
3k views

QNAP TS-859U+ RAID5 volume unmounted, e2fsck_64 hangs

We got this QNAP TS-859U+ with firmware version 3.8.1 Build 20121205 at our datacenter. It has Intel(R) Atom(TM) CPU D525 @ 1.80GHz processor and 1GB RAM, 8 of 3TB (Seagate ST33000651AS CC44) drives ...
0
votes
1answer
95 views

How to get live scsi traces from Vscsistats?

Here are things I already know, using vscsistat -t option I can get command traces for "VM/.vmdk" on ESxi. Steps to get scsi traces are: Start capturing traces, On Successful starting will ...
52
votes
21answers
31k views

Storing a million images in the filesystem

I have a project that will generate a huge number of images. Around 1,000,000 for start. They are not large images so I will store them all on one machine at start. How do you recommended on ...
1
vote
0answers
19 views

Xen server storages unplugged [closed]

In order exit a xen VM and a domain from halt state I destroyed the domain and restarted the VM. Now in xen centre I see all the storages disconnected. I tried to repair using xencenter but no luck. ...
0
votes
0answers
12 views

remote location mounted with mount.fcifs doesn't show in FTP

I am using Centos 6.6 and I mounted a remote location by this command: mount.cifs -o user=adrian,pass=1234,uid=adrian_site,gid=psacln //server/path /local/path So I specified the user and group, in ...
144
votes
2answers
28k views

What are the different widely used RAID levels and when should I consider them?

This is a Canonical Question about RAID levels. What are: the RAID levels typically used (including the RAID-Z family)? deployments are they commonly found in? benefits and pitfalls of each?
12
votes
5answers
6k views

Any experience with SATA SAS Interposer Cards?

Driven by the current price difference between SATA and SAS disks on one side and the potentially bad behaviour of SATA disks in bigger storage arrays on the other side, I have found so-called SATA-to-...
3
votes
0answers
142 views

VMware ESXi and Intel DC3700 (NVMe) Poor Performance Even With Intel's Driver

I'm running VMware ESXi 6.0.0 with the Intel DC3700 800GB. My VM is running Windows 10 x64 with 8GB RAM and 4CPU Cores. The entire VM is 32GB and sits on the SSD. I'm using CrystalDiskMark at 1GiB ...
1
vote
1answer
43 views

HDD seq. read performance

I read the specs for one of the latest Hitachi HDD, https://www.hgst.com/sites/default/files/resources/USC10K1800_ds.pdf . It indicates a speed of SAS 12 Gb/s which is 1.5 GB/s. Is it the sequential ...
1
vote
1answer
101 views

local storage on proxmox cluster, how to make it really local?

I am playing a bit around with proxmox cluster. I have 2 servers. One of them, lets call it Virt01, has an extra disk, for storage. I created a new extra local storage withis thuis disk, but proxmox ...
9
votes
1answer
163 views

Mixing HBAs in a failover cluster?

I have a two server failover cluster, and for various reasons - they're on mismatched hardware. One has Emulex HBAs installed, the other Qlogic. I'd be twitchy about using two different makes/...
1
vote
1answer
76 views

RAID 6 >80% Highest Active Time with small I/O

I have a RAID 6 with 18 disks. It is used as a storage for small images(5-500Kb). It is about 6TB full of data. I have an utility that reads that images to the ram and then send it over network. I ...
0
votes
1answer
32 views

exchange 2010 storage on hyper-v

Working on planning new Exchange 2010 to migrate my existing email infrastructure on it. I have ~120 users with ~3-8 Gb mailboxes and a lot of public folders (~80 Gb). Total used mailbox space on ...
3
votes
2answers
205 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 ...
0
votes
0answers
95 views

Xenserver 6.5 Live Storage Migration

In my xenserver environment I have an LVM over ISCSI storage repository (SR) and I have another SR which is an NFS share setup on a synology server. To be clear, all servers are in one resource pool. ...
14
votes
5answers
32k views

Howto check disk I/O utilisation per process

Im having a problem with a stalling Linux system and I have found sysstat/sar to report huge peaks in disk I/O utilization, average service time as well as average wait time at the time of the system ...
1
vote
0answers
68 views

Changing content storage path for Azure pack websites

I'm wondering if it's possible to change the content storage location within Windows Azure pack websites. I want to change my existing cloud's storage from a standalone Windows file server to a Linux ...
3
votes
4answers
4k views

HP smart array P812i and storage works enclosure D2700 BAD PERFORMANCE

I have HP DL360 G6 with Smart Array P812i and Storage Works D2700 enclosure. Enclosure has 25x148GB 15K SAS 6G drives in RAID10 mode. P812i has 512mb cache (50% read/50% write) Crystal Disk mark ...
3
votes
1answer
2k views

Sizing of journal disks with Microsoft Storage Spaces parity volume

I'm currently speccing out a new backup server. It's going to be running Windows Server 2012 R2 with Direct Attached Storage, and I'm considering using Storage Spaces rather than using a RAID card. (...
0
votes
2answers
138 views

How big are my disk arrays?

On my SunOS 5.10 host are there 3 Sun 6140 disk arrays, and I would like to know the disk capacities. According to zpool list do I have a 5TB and 16TB pool. format shows me only 12 disks c2t1d31: ...
1
vote
3answers
697 views

Convert RAID from Mechanical Disks to SSD?

Any issues with converting a Mechanical Disk RAID to SSD by replacing the drives one-by-one? I couldn't find anyone online who has done this, so let's make this the place to post about it. If you ...
2
votes
1answer
40 views

Why are some disks and some are LUNs?

Question at the bottom. I would like to use a Sun StorageTek 6100 as JBOD for ZFS, and so I have connected it to OmniOS over FC with a QLC2462 HBA. The disk array doesn't have a controller tray, just ...
0
votes
1answer
5k views

PowerVault MD3000 Password Reset Console Password

I need to reset the password on a Dell PowerVault MD3000. I have the necessary password reset cable and am able to get to the point where I am prompted for the "password from Dell Technical Support" (...
2
votes
1answer
51 views

IBM BladeCenter S storage module

I am new to this forum and have a question I'd like to ask. I have a client who is running a BladeCenter S, which includes a 6-disk Storage Module (44Y1405/44E8057). The problem they have is that ...
-1
votes
1answer
366 views

Ubuntu + ZFS vs Rockstor [closed]

I have a personal fileserver at home with 6 HDs: 1 500 GB one for the OS 1 4 TB one for temporary data four 2 TB ones that we want to configure in some sort of RAID 5 fashion It looks like I have ...
-1
votes
1answer
47 views

Removing all hw raid from Sun server

This post is about the same server as this post, where multiple disks were in a LUN, and then ZFS was used to make the ZFS pools. I would like to use the 6140 disk arrays as JBOD's on either Linux or ...
0
votes
0answers
399 views

Storage Spaces Write Rate Issue

I am setting up a Windows 2012 R2 Storage Spaces array. It is setup with 24 drives, 22 of them mirrored, with 2 hot spares, in 11 columns. I am useing a LSI 9207-8e HBA card with the latest IT ...
0
votes
0answers
12 views

Debian used + available does not equal size (storage) [duplicate]

I'm trying to find out why /dev/sda1 Used+Avail != Size. I ran a df -h and the output I get is this: File system Size Used Avail Use% Mounted on /dev/sda1 320GB 683M 303G 1% ...