SSD cache bcache fails randomly -


i have file server has 4 sata drive , 1 ssd drive. ssd drive being used ssd cache (bache) 4 sata drives. of time works great @ least once weak, ssd drive (or rather bcache) gives out kernel panic/ error , goes down. during time way recover bcahce restart server. mind you, no file being lost or corrupted files during time.

my disk layout (bcache off here):

name        maj:min rm   size ro type mountpoint sda           8:0    0 149.1g  0 disk ├─sda1        8:1    0 133.4g  0 part / ├─sda2        8:2    0     1k  0 part └─sda5        8:5    0  15.7g  0 part [swap] sdb           8:16   0   2.7t  0 disk └─sdb1        8:17   0   2.7t  0 part   └─bcache0 251:0    0   2.7t  0 disk /var/www/html/directlink/ftp1 sdc           8:32   0   3.7t  0 disk └─sdc1        8:33   0   3.7t  0 part   └─bcache2 251:2    0   3.7t  0 disk /var/www/html/directlink/ftp3 sdd           8:48   0   3.7t  0 disk └─sdd1        8:49   0   3.7t  0 part   └─bcache3 251:3    0   3.7t  0 disk /var/www/html/directlink/ftp4 sde           8:64   0   477g  0 disk └─sde1        8:65   0   477g  0 part sdf           8:80   0   1.8t  0 disk └─sdf1        8:81   0   1.8t  0 part   └─bcache1 251:1    0   1.8t  0 disk /var/www/html/directlink/ftp2

sde ssd cache sda os drive rest 4 sata drive mentioned. ext4. when attach backing drive cache drive works great. until fails.

sep 27 15:32:06 vas kernel: [417153.363196] bcache: bch_btree_gc() gc failed!

the server gets pretty decent usage 100 people downloading stuff during peak time (over lan).

any appreciated. if need information, let me know.


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