New answers tagged

1

A software RAID1 needs to duplicate each data chunk, effectively transmitting it two times down the SB and SATA link. This means that sometime, due to bus congestion a significant IOPS decrease can be observed when using high performance storage drivers (in your case, SSDs). Try to increase the I/O queue length and/or to switch to deadline scheduler, as ...


1

You have several choices: Cheap USB 2.0 stick: not recommended because they are slow and the writes will kill most of them pretty quickly, exception: a read-only system like SmartOS (for ZFS) or ESXi (no ZFS, just as an example) which only writes at bootup or once an hour and keeps everything else in RAM or your data pools. More expensive USB 3.0 stick ...


2

For something of this scale, use a separate drive or pair of drives for the OS. Perhaps the M.2 SSD slot is the most appropriate. Give ZFS the full disks and don't attempt to spread the OS across those drives. For home-scale, don't listen to all of the suggestions to get a ZIL and L2ARC. The ZIL is only useful for synchronous writes, and the L2ARC is ...


1

Possible solution for this, took a bit to get into the details. My system: CentOS 6.5 mdadm v3.3.2 Constant checks every week, wanted to pause one of them, RAID is clean, check was called via the /etc/cron.d/raid-check script which is run weekly. To cancel the check, you use the --misc --action function. Assuming the RAID device is /dev/md0 and this is ...


1

When an actual rebuild is being performed, the output of mdadm --detail shows which disk is active and which disk is being rebuilt (at the bottom): # mdadm --detail /dev/md4 /dev/md4: Version : 0.90 Creation Time : Wed May 4 17:27:03 2016 Raid Level : raid1 Array Size : 1953511936 (1863.01 GiB 2000.40 GB) Used Dev Size : 1953511936 ...



Top 50 recent answers are included