Dysk i Spółka • RAID/NAS
When an array goes degraded, offline or loses a volume, the order of actions matters. We preserve the disk order, image member drives and reconstruct the RAID on copies.
Response to the RAID/NAS incident
The greatest losses in RAID/NAS occur after chaotic repair attempts. Stop writing, preserve disk order, and consult next steps before rebuilding.
A RAID or NAS failure is a technical incident, not a place for trial-and-error repairs. One restart, blind rebuild, disk swap or configuration reset can change metadata and make the original array harder to reconstruct. If the array is degraded or offline, shares have disappeared, the NAS no longer mounts the volume or a rebuild is stuck, stop writes and preserve the current state.
At Dysk i Spółka we reconstruct RAID 0, RAID 1, RAID 5, RAID 6, RAID 10 and RAID 50/60 environments from NAS devices, servers and workstations. If the storage is a Synology, QNAP or WD NAS, see the NAS recovery procedure. For VMware, Hyper-V, SAN, VMFS or CSV environments, start with virtualisation and SAN recovery. Classic member-disk faults are diagnosed as HDD or SSD/NVMe failures, but the array is reconstructed from copies, not from the live disks.
Before delivery, label the bay order, note the NAS or controller messages and write down what happened immediately before the failure. You can describe the case online or call 573 532 490. For companies outside Warsaw, we prepare a safe shipping path after the initial symptom review.
A RAID failure may start quietly: the panel shows a degraded state, one member disk is missing, a network share disappears or the server becomes very slow under ordinary reads. In other cases the controller loses the array configuration after a power outage or firmware update.
Typical symptoms of RAID problems also include errors when reading files, inability to access network shares, or a situation in which the RAID controller no longer recognizes the array configuration. In such cases, you should not run a rebuild without prior analysis, as this may overwrite metadata and make data recovery more difficult.
These are the moments when the array should be treated as evidence. The useful details are the exact status, disk bay order, disk serial numbers, event logs and the last action taken before the failure.
Do not force reconstruction blindly. First, we analyse the disk layout, image the readable member drives and identify the RAID parameters such as order, stripe size, parity rotation and offset. Do not initialise volumes and do not run automatic repairs.
When a NAS or server asks to initialise a volume, the safest answer is to stop. The prompt may appear after metadata damage, disk order changes or a controller issue. We verify the array structure before any logical repair is attempted.
A failed rebuild is one of the highest-risk scenarios. If the rebuild froze, restarted or was launched with the wrong source disk, every additional write can reduce consistency. We stop destructive processes and recreate the array virtually on copies.
For a similar incident, see the RAID/NAS failed rebuild case study.
Common RAID/NAS mistakes to avoid:
Safer path: shut the server or NAS down if it is still writing, label the disks, save logs or photos of error screens and describe the case before another rebuild attempt.
Most RAID and NAS failures are not only "one bad disk". The lab must understand the metadata that defines the array, the condition of each member disk and the file system built on top of the volume.
Key parameters include RAID level, disk order, stripe size, parity rotation, offset, partition table, LVM or storage-pool layout and the file system itself. In RAID 5, for example, a second weak disk can turn a routine degraded state into a partial reconstruction case.
If more drives fail than the RAID level can tolerate, recovery may require work on the damaged member disks first. The objective is to stabilise reads, image what can be imaged and reconstruct the most consistent virtual array from the available data.
A hardware RAID controller, NAS firmware or software RAID layer may also be the reason the volume is no longer visible. In those cases we do not need to "repair" the original controller first; we can often emulate the configuration in a controlled environment.
Supported configurations and environments include:
Any repair attempt that writes to the array can change the evidence we need. The safest response is to stop the array, document what happened and keep the original disk order intact.
Please contact us by phone first. We will help you with the safe dismantling and collection of your equipment.
What data recovery from RAID/NAS looks like: we start with risk assessment and disk imaging, then reconstruct the array virtually, verify the file system and report the realistic recovery scope. For business cases, an NDA can be signed before work begins.
Different levels of RAID arrays are used in server and NAS systems, which differ in the way of data recording and the level of redundancy. The most common configurations are RAID 0, RAID 1, RAID 5, RAID 6 and RAID 10.
RAID 0 provides high performance but does not offer redundancy, so the failure of one drive results in data loss. RAID 1 uses mirroring, i.e. recording data on two disks. RAID 5 and RAID 6 use parity, which allows data to be rebuilt after a failure of one or two drives.
Professional data recovery from RAID begins with diagnostics of all drives in the array. Each storage device is imaged sector by sector to protect the original data from further corruption.
Based on the disk copies, the array configuration is reconstructed, including the disk order, data stripe size and parity algorithm. Only after correct reconstruction of the RAID structure is it possible to recover user files and reconstruct the file system.
If the problem is with a NAS device, a virtual environment, or the entire enterprise infrastructure, go to the closest service instead of extending the diagnosis to random HDD/SSD scenarios.
If you care about your data, be careful with rebuilding. This can increase the risk of overwrites in many scenarios - it's best to run diagnostics before taking action.
Most often, just the drives are enough, but sometimes you need configuration information or a controller. After the initial analysis, we will tell you what will be necessary.
When you contact us, the most useful information is the NAS or controller model, RAID level, number of disks, bay order, status messages and the last action taken before the failure.
For company RAID/NAS cases, the safest plan is to freeze the current state before another rebuild, resync or controller change. Slot order, member-drive condition, controller messages and the last administrator action are often more important than a quick attempt to bring the volume online.
Send the disk order, RAID level if known, NAS or controller model, event log messages and a short priority list for business data. This lets the lab decide whether the case should start from member-drive imaging, virtual RAID reconstruction or database/file-system work on a copy.
Often the member disks and original bay order are enough. In some cases controller model, NAS logs or server configuration are also useful; we confirm the safest handover path before delivery.
RAID level, disk count, bay order, disk serial numbers, controller or NAS model, error messages and the last action before failure help us choose a safer diagnosis path.
Stop further writes. The result depends on how much metadata changed, so the next step is imaging the member disks and checking whether the original layout can still be reconstructed.
Yes. We handle RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 50 and RAID 60, plus selected NAS, server and software RAID layouts.
Often there are still recovery options, but another rebuild can reduce them. Preserve disk order, do not initialise the volume and request diagnosis before additional writes.
The price depends on disk count, disk condition, RAID level, file-system damage and reconstruction time. You receive a quote after diagnosis and before recovery work begins.
When business data is blocked, the useful first step is not another rebuild. It is a controlled diagnosis based on disk order, event history and member-drive condition.
Before you submit a RAID or NAS case, compare the current status with the most common risk scenarios: a degraded array that still looks partly healthy and a degraded/offline array where the next action can decide the outcome.
Why a degraded status can still be dangerous and what to secure before replacing drives, rebuilding or changing controller settings.
Read the guideA practical checklist for preserving disk order, logs, metadata and parity state before another rebuild or resync attempt.
Read the guide