Hi. We have two identical SSD disks:
ada0 works fine. ada1 worked fine too, up until recently. Its read speed is normal, but writes are limited to about 1mb/s. Here's the output of gstat so you get the idea:
Please note the low writes per second and low throughput, and how long each write op takes (1280 ms) for ada1 compared to fractions of ms for ada0.
Normally this drive hosts MySQL backups taken nightly by innobackupex, but it doesn't really matter, a simplee big file copy operation is enough to experience speed problems. Also, at the time the write operations are taking place it becomes impossible to ^C ^Z or kill -TERM any such process, even kill -KILL doesn't kill it right away. When no write operations are taking place the drive sits idle (as per gstat). What could be wrong with it? I've tried rebooting, too (FreeBSD 10.3).
zfs config is pretty simple and it's similar to our other drives & servers.
Thanks for any tips.
Code:
ada0 at ahcich4 bus 0 scbus5 target 0 lun 0
ada0: <INTEL SSDSC2BB480G6 G2010140> ACS-2 ATA SATA 3.x device
ada0: Serial Number PHWxxxxxxxxxxxxFGN
ada0: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 512bytes)
ada0: Command Queueing enabled
ada0: 457862MB (937703088 512 byte sectors)
ada0: Previously was known as ad12
ada1 at ahcich5 bus 0 scbus6 target 0 lun 0
ada1: <INTEL SSDSC2BB480G6 G2010140> ACS-2 ATA SATA 3.x device
ada1: Serial Number PHWxxxxxxxxxxxxFGN
ada1: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 512bytes)
ada1: Command Queueing enabled
ada1: 457862MB (937703088 512 byte sectors)
ada1: Previously was known as ad14
ada0 works fine. ada1 worked fine too, up until recently. Its read speed is normal, but writes are limited to about 1mb/s. Here's the output of gstat so you get the idea:
Code:
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
1 4154 651 40593 0.9 1929 128759 0.2 71.8| ada0
10 8 0 0 0.0 8 1022 1280 102.1| ada1
Please note the low writes per second and low throughput, and how long each write op takes (1280 ms) for ada1 compared to fractions of ms for ada0.
Normally this drive hosts MySQL backups taken nightly by innobackupex, but it doesn't really matter, a simplee big file copy operation is enough to experience speed problems. Also, at the time the write operations are taking place it becomes impossible to ^C ^Z or kill -TERM any such process, even kill -KILL doesn't kill it right away. When no write operations are taking place the drive sits idle (as per gstat). What could be wrong with it? I've tried rebooting, too (FreeBSD 10.3).
zfs config is pretty simple and it's similar to our other drives & servers.
Code:
$ zfs get all ssd1/xtradb-backups
NAME PROPERTY VALUE SOURCE
ssd1/xtradb-backups type filesystem -
ssd1/xtradb-backups creation Fri Oct 6 8:26 2017 -
ssd1/xtradb-backups used 197G -
ssd1/xtradb-backups available 228G -
ssd1/xtradb-backups referenced 197G -
ssd1/xtradb-backups compressratio 1.03x -
ssd1/xtradb-backups mounted yes -
ssd1/xtradb-backups quota none default
ssd1/xtradb-backups reservation none default
ssd1/xtradb-backups recordsize 128K local
ssd1/xtradb-backups mountpoint /var/backups/xtradb local
ssd1/xtradb-backups sharenfs off default
ssd1/xtradb-backups checksum on default
ssd1/xtradb-backups compression lz4 local
ssd1/xtradb-backups atime off local
ssd1/xtradb-backups devices on default
ssd1/xtradb-backups exec on default
ssd1/xtradb-backups setuid on default
ssd1/xtradb-backups readonly off default
ssd1/xtradb-backups jailed off default
ssd1/xtradb-backups snapdir hidden default
ssd1/xtradb-backups aclmode discard default
ssd1/xtradb-backups aclinherit restricted default
ssd1/xtradb-backups canmount on default
ssd1/xtradb-backups xattr off temporary
ssd1/xtradb-backups copies 1 default
ssd1/xtradb-backups version 5 -
ssd1/xtradb-backups utf8only off -
ssd1/xtradb-backups normalization none -
ssd1/xtradb-backups casesensitivity sensitive -
ssd1/xtradb-backups vscan off default
ssd1/xtradb-backups nbmand off default
ssd1/xtradb-backups sharesmb off default
ssd1/xtradb-backups refquota none default
ssd1/xtradb-backups refreservation none default
ssd1/xtradb-backups primarycache all default
ssd1/xtradb-backups secondarycache all default
ssd1/xtradb-backups usedbysnapshots 0 -
ssd1/xtradb-backups usedbydataset 197G -
ssd1/xtradb-backups usedbychildren 0 -
ssd1/xtradb-backups usedbyrefreservation 0 -
ssd1/xtradb-backups logbias latency local
ssd1/xtradb-backups dedup off default
ssd1/xtradb-backups mlslabel -
ssd1/xtradb-backups sync standard local
ssd1/xtradb-backups refcompressratio 1.03x -
ssd1/xtradb-backups written 197G -
ssd1/xtradb-backups logicalused 203G -
ssd1/xtradb-backups logicalreferenced 203G -
ssd1/xtradb-backups volmode default default
ssd1/xtradb-backups filesystem_limit none default
ssd1/xtradb-backups snapshot_limit none default
ssd1/xtradb-backups filesystem_count none default
ssd1/xtradb-backups snapshot_count none default
ssd1/xtradb-backups redundant_metadata all default
Thanks for any tips.