If it holds true, then we can safely say that the data in the array is consistent. First of all, we know that the parity information in each drive should satisfy Function 1 shown above. Now that we have a basic understanding of the characteristics of RAID 5, then we can go on to talk about data consistency. This is how RAID 5 achieves redundancy, protecting your data against drive failure. The recovered contents are what we call a redundant copy. Suppose the drive containing A2 breaks, then we can perform the following XOR calculation to reconstruct it: A2 = A1 (XOR) A3 (XOR) Pa (Function 2) If one of the drives fails, RAID 5 will repair the missing data by using Pa and contents of the remaining two drives. When writing A1, A2, and A3, RAID 5 will use the following XOR to calculate Pa and write it to the corresponding block. What about Pa, Pb, and Pc? They are parity blocks distributed across the drives. Likewise, it reads data in the same order. When writing a block of sequential data into the array, for example, RAID 5 will write it into A1, A2, A3, B1, B2, B3 in sequence. RAID 5 : It requires at least three drives and utilizes parity striping at the block level. Here we’re going to briefly introduce RAID 5. Simply put, it combines multiple drives into a single storage pool, offering fault tolerance and data redundancy. RAID stands for redundant array of independent disks. Read on to see how data scrubbing prevents your digital assets from data corruption.īefore we go into detail about data scrubbing, let us introduce RAID arrays to you first. The two images below are the original photo and the corrupt one that suffers from bit rot. It could be a real disaster if it happens to one of your precious photos capturing the indelible memories. Worse still, they occur silently without any warning. As times goes by, some data may fall victim to slow degradation that gradually deteriorates data integrity. I asked guys at the #freenode IRC chan who told me to open this bug report.Small steps to big protection for your storageĭata scrubbing, as the name suggests, is a process of inspecting volumes and modifying the detected inconsistencies. I used very easy login/password to debug but I surely failed at fixing correctly the python errors (types errors are in crypto functions mainly). com/openstack/ cinder/ tree/master/ cinder/ volume/ drivers/ synology, but I get the exact same error.ģ) I tried to fix the python errors due to python3 changes (7 errors from types between bytes and string), but I get an authentication failed when cinder-volume tries to log in. managerġ) I tried to use python2 but I get errors from cinder-volume start.Ģ) I tried using the lastest (stable 1.0.1 then HEAD) synology version from https:/ /github. manager TypeError: can only concatenate str (not "bytes") to str manager File "/usr/lib/ python3/ dist-packages/ cinder/ volume/ drivers/ synology/ synology_ common. manager params = self._encrypt_ params( params) manager File "/usr/lib/ python3/ dist-packages/ cinder/ volume/ drivers/ synology/ synology_ iscsi.py", line 45, in do_setup manager File "/usr/lib/ python3/ dist-packages/ cinder/ volume/ manager. manager Traceback (most recent call last): manager Failed to initialize driver.: TypeError: can only concatenate str (not "bytes") to str manager Starting volume driver SynoISCSIDriver (1.0.0) Running Debian 10, base python version is 3.7.3 or 2.7.16.Įrror is the following when starting cinder-volume while using the Synology Backend :
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