Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 04/03/2012 02:53 AM, Lukas Gradl wrote: > As we've just space for one 3.5" HDD (the other bay is used by the > Boot-SSD) I'm unable to install a raid5-setup. Three things; 1. RAID 5 will shorted the life of SSDs. 2. RAID 1+0 is faster than RAID 5, if you can afford the reduced capacity. 2. cat /sys/block/sdb/queue/rotational If set to '1'; echo 0 > /sys/block/sdb/queue/rotational That made a significant improvement on my test bed (albeit with hardware RAID 5 [LSI-9265 w/ SSDs and HP P410i w/ 10krpm SAS HDDs). As for dual-primary/Protocol C; I've got nine clusters in production, some under heavy load, hosting both Linux and Windows VMs. These operate just fine, with proper config of the storage. For example; in some cases, I use a couple separate RAID 1 arrays, in others I used RAID 5. All use traditional platter drives (some SATA, most SAS). None of these clusters are over the top, performance wise. -- Digimer Papers and Projects: https://alteeve.com