some serious database degradation is going on with the poast matrix. offlining now to swap the drives to the other racked chassis and im going to attempt to repair the database. downtime will be probably at least an hour, likely 4 or 5
@splitshockvirus this was planned. I had racked a new chassis with more or less the same config in January but we just hadn't swapped the drives over yet and last night I watched the matrix fire off millions of errors while the raid dropped two drives and for fear of database damage i immediately turned it off. glad i did. running like a top now
@sjw@splitshockvirus not really beyond maybe cost since you're not limited to having 3 or more disks you can theoretically do it with 2 but I would just opt for RAID5 for the kick to performance
@graf@splitshockvirus yeah I guess in theory RAID 4 could be put on just two disks but that's just RAID 1 with extra steps and probably worse performance.
@sjw@splitshockvirus and that's what i was referencing. no real idea why somebody would use RAID 4 with 2 disks and not opt for RAID 1 instead, but it is a cheaper alternative. in addition when used on SSDs RAID4 actually has 15-20% faster reads than RAID 5
I'd like to set up a RAID 420 just for the memes but since RAID 2 requires all the drives' platters angle to be synced so I doubt I'd be able to use it on consumer hardware.
@sjw@splitshockvirus no because all data is read off data disks not parity disks. im not very good at explaining things but this page has kind of an explanation of what i mean softraid.com/raid_levels/
@RedTechEngineer@graf@splitshockvirus so RAID 2 was designed back in the 50s and 60s when computers and hard drives were very different and a single hard drive weighed 80 kg for like 5 MB.
Computers were designed very differently back then. However it was very complex and expensive to implement so it rarely ever got used. However RAID 3 wasn't nearly as complex and tedious. It has shortcomings compared to RAID 4 and RAID 5 tho.
I'm kind of surprised there is no RAID 7 since some RAID card manufacturers have their own version of it plus ZFS essentially has it.
I'm still waiting for ZFS to allow you to change raidz level.
@graf@splitshockvirus basically the only difference between RAID 4 and RAID 5 is that RAID 4 uses a dedicated parity drive in the array whereas RAID 5 distributes the parity data across all the drives.
@graf Right now my problem is I can't recognize my replacement drives. II get a drive letter but can't use it (factory new and tested).
And I can't determine, if the tech dropped the new drive and just lied, the port was damaged because he slammed the sled in and bent the port or if the backplane is faulty. It's the second chassis I have that's like this in this and the chassis had like 3 year uptime with no problems prior.
@graf I'd fly there if I didn't have pets to take care of and work thought it was a good use of a plane ticket and hotel. But no, everything has to be done through email or ticket remote hands. It fucking sucks.
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