-
Hello everyone,
I currently have two Synology NAS with two bays each, each mounted with their respective RAID 1.
The question arises when one of the two NAS breaks, do you know if I can remove a disk from the other NAS to plug in one of the disks from the broken one?, just to access the data from the broken Synology, so that there would be two different volumes of raid 1 with only one disk each volume. After recovering the data, I would plug the corresponding disk back into its RAID.
I don't know if I explained myself…
Thanks!
-
Hello:
It worked for me when I changed the motherboard, but from an intel chipset to an intel chipset. With a NAS I don't know, unless they are the same in firm and other things. Anyway, since it's raid1 you could access the data from a normal PC.
-
The problem that NAS have is that it's not as easy as connecting to a PC and accessing the data. Since they are brand-specific RAID, it is necessary to use some program to recover the data and on top of that it takes a long time. That's why I was asking if anyone knows if by plugging one of the disks into another similar or equal NAS, it would recognize it or simply try to rebuild the RAID of the main one by erasing the data from the disk that I just put in.
how difficult it is to explain oneself with these things <:(
-
From what I deduce by looking at the manufacturer's page and not knowing the exact model... it is likely that it uses the ext4 system, that is, if it cannot be read from Windows, it can certainly be accessed by plugging the disk into Linux... unless the disk is encrypted, which is another issue.
If the normal thing would be that by inserting an empty disk in place of the one that is broken, it would automatically try to rebuild the RAID... THAT WOULD BE NORMAL because, to know the characteristics of the model, you will have to look at the documentation. -
Yes, if one of the disks fails, the system rebuilds the RAID by adding another new disk. But that wasn't the question, my doubt is whether I could put one of the disks from another RAID1 mounted on a second NAS in the first NAS, either by plugging it into the second bay or by connecting it directly to the eSATA connection of the NAS. Could two disks belonging to different RAID1s coexist?
-
Disassembling the RAID first before plugging in the other disk yes, otherwise you'll make a mess.
-
Raid Recovery. With this I managed to recover a Windows raid5 that decided to go elsewhere. What I did was tell it that the other hard drive was lost and voilà. Moreover, although I have not tested the program with EXT4, it is supposed to be able to read it.
Kernel1.0, do you think it will be necessary to undo the raid? -
I didn't express myself well, there's nothing to undo.
What you need to do is put the NAS to work in non-RAID mode.
-
What I wanted was to avoid having to use software to recover the raid, as it takes a long time. That's why I was asking if it would be possible to move the disk from one nas to another, being the two nas the same, even it could be connected by eSATA so as not to have to dismantle the raid from one of the nas. I don't know if it would read the data from the disk hung.
-
What I wanted was to avoid having to use software to recover the raid, as they take a long time. That's why I was asking if it would be possible to move the disk from one NAS to another, being both NASs the same, even it could be connected via eSATA to avoid having to dismantle the raid from one of the NASs. I don't know if it would read the data from the hung disk.
What, you didn't have a RAID 1? What are you telling us?
A RAID 1 creates an exact copy (or mirror) of a set of data on two or more disks. This is useful when read performance is more important than capacity. A RAID 1 set can only be as large as the smallest of its disks. A classic RAID 1 consists of two mirrored disks, which exponentially increases reliability compared to a single disk; that is, the probability of the set failing is equal to the product of the failure probabilities of each of the disks (since for the set to fail, all its disks must fail).
Additionally, since all data is on two or more disks, usually with independent hardware, read performance increases approximately as a linear multiple of the number of copies; that is, a RAID 1 can be reading two different data simultaneously on two different disks, so its performance is doubled. To maximize the benefits on the performance of RAID 1, the use of independent disk controllers is recommended, one for each disk (a practice that some call splitting or duplexing).
As in RAID 0, the average read time is reduced, since the sectors to be searched can be divided between the disks, lowering the search time and increasing the transfer rate, with the only limit being the speed supported by the RAID controller. However, many old RAID 1 IDE cards read only from one disk of the pair, so their performance is equal to that of a single disk. Some old RAID 1 implementations also read from both disks simultaneously and compare the data to detect errors.
When writing, the set behaves as a single disk, since the data must be written to all the disks in the RAID 1. Therefore, the performance does not improve.
RAID 1 has many administration advantages. For example, in some 24/7 environments, it is possible to «split the mirror»: mark a disk as inactive, make a backup of that disk and then «rebuild» the mirror. This requires that the application managing the set supports the recovery of the disk data at the time of the split. This procedure is less critical than the presence of a snapshot feature in some file systems, in which some space is reserved for changes, presenting a static view at a given temporal point of the file system. Alternatively, a set of disks can be stored in a way similar to how traditional tapes are done.
-
Let's see, I must not have explained myself well. I know very well what a RAID1 is. In the first post, I said that I have two NAS with two bays each and each NAS in raid1. And the question is, in the event that one NAS breaks (not the HD but the NAS itself), does anyone know if I could put a disk from that broken NAS into the other NAS to be able to read the data directly? I already know that there is software to recover raid, but if the other NAS, which is exactly the same, reads it, I save a lot of time.
Thanks.
The two NAS are Synology DS213+
-
In a RAID 1 there is nothing to recover since the two disks are the same, you only need to connect them to a computer with an operating system that reads the format that the disk has in this case ext4, which any Linux operating system does or by connecting one disk to the other NAS using the esata.
-
Well, that's the theory, but you know that, especially in nas, each manufacturer puts a little bit of them and it's not as easy as connecting a nas disk to a pc to be able to read the data, not even when we talk about raid1, hence my question.
Well, thank you for everything, I'll look into it and see if I can do the test myself to know if it's possible to read the data from another equal nas.
By the way, I already did the test of connecting the raid1 disk to a pc some time ago just in case and it's as I commented above.
Goodbye.
-
Most probably it will happen as Kernel already told you: you would have to hack into a PC with Windows and you wouldn't read it because it's on EXT. Next time, try with Linux or change the disks between your 2 NAS and you'll stop having doubts and you can see for yourself if it works or not. I highly doubt that any NAS (unless it's for a specific purpose) encodes the data or has it in a proprietary type of partition, it would be absurd.
-
When I connected it to the PC, several partitions appeared and the data was not accessible on any of them, but I will try it again as you say.
What you said about changing the disks of the two NAS was what I was asking, whether there is any problem if one disk from one RAID is connected and another from the other RAID generated in the other NAS. This was the initial question.
-
The only thing that would happen is that if you don't disable the raid in the nas bios, when you unplug a disk it will rebuild the raid and you will lose the data from one of the disks. That's the theory and practice. Don't do it. Always disable the raid first. What might happen is that when you turn it back on, if you've changed their position or copied new data, it will tell you to rebuild, and it will ask you for a backup disk and a disk to copy. If you don't be careful, you will lose the last changes.
Do what I tell you Bm4n if you want to see it on a pc. -
Ok, thanks. I'll try it carefully. Anyway, I suppose that if I connect it via eSata, it won't be able to rebuild the raid, since in the nas you can only mount raid on the internal disks.
Best regards
-
Ok, thanks. I'll try it carefully. Anyway, I guess that if I connect it via eSata it won't be able to rebuild the raid, since in the nas you can only mount raid on the internal disks.
Best regards
Your concern is to reinstall the RAID, on the one hand you have to understand that a RAID1 is made to work whether the 2 disks are there or only 1 is with which if you put a new hard drive the software should be able to rebuild it automatically. If you had to do it manually it is easy to make an image of the disk and burn it to a new disk, once done you will have two identical disks ready for RAID1. You should also be able to access the data from the remaining disk from a Linux. Don't mix plugging it into a PC to read with rebuilding a RAID…
For example the instructions of a common NAS, so you can see that it is the most normal thing in the world, and search a little on the web with your model to see what you find: Replacing a failed hard drive | macsynology
