`hyades-1` is same, but it has been replaced by the `hyades-2` new server and is currently used as a spare server.
Both has errors on HDD.
`hyades-0` : one of the hard disk has error. Since it is part of RAID disk, system (OS) is running on a disk that is not corrupted.
It is necessary to stop/reboot system for RAID disk repair, we postpone to repair `hyades-0` this time.
We will try in next chance, e.g. power outage or slightly longer (a few days) interruption is permitted.
`hyades-1` : one of the hard disk has error, and the system (OS) cannot mount it.
So we change OS's as skip mounting this RAID in boot.
Also, we are rebuilding the hard drive using RAID BIOS function. It may finish in several hours - one day.
If the rebuilding finish successfully, we will try to mount from OS.
RAID rebuild
As Kanda-san reported, the RAID rebuild on hyades-1 is currently in progress and is expected to take several hours or longer. For this reason, the RAID management screen has been left open on hyades-1 (see Fig.1). Although it is unlikely that anyone will need to access it, please do not touch or use hyades-1 until the rebuild is complete.
KVM Cable Installation for Hyades
When hyades-1 was moved from the B1 rack to the N1 rack and eventually decommissioned, only one KVM cable for the Hyades servers remained in the B1 rack. As a result, the cable had to be switched between hyades-0 and hyades-2 as needed.
The KVM cable that had been used for the now-retired hyades-1 could have been reused for hyades-2. However, it appears that when hyades-2 was initially deployed, there were issues connecting it to k1fw1. As a result, hyades-1, which had been moved to the N1 rack, continued to be used for some time, and the KVM cable was moved to the N1 rack along with it. The current situation appears to be a remnant of that arrangement (see also klog#22520 and klog#23114).
Having to switch the KVM cable between hyades-0 and hyades-2 was inconvenient for investigations and maintenance work such as this one. Therefore, we installed an additional KVM cable so that both hyades-0 and hyades-2 can remain connected to the KVM console at all times.
