Isn't there a very big (>40GB) sstable in /volumes/cassandra/data/data1? If there is you could split it or change your data model to prevent such sstables.
Sent using https://www.zoho.com/mail/ ============ Forwarded message ============ From: Loïc CHANEL via user <user@cassandra.apache.org> To: <user@cassandra.apache.org> Date: Fri, 06 Jan 2023 12:58:11 +0330 Subject: Re: Cassandra uneven data repartition ============ Forwarded message ============ Hi team, Does anyone know how to even the data between several data disks ? Another approach could be to prevent Cassandra from writing on a 90% full disk, but is there a way to do that ? Thanks, Loïc CHANEL System Big Data engineer SoftAtHome (Lyon, France) Le lun. 19 déc. 2022 à 11:07, Loïc CHANEL <mailto:loic.cha...@telecomnancy.net> a écrit : Hi team, I had a disk space issue on a Cassandra server, and I noticed that the data was not evenly shared between my 15 disks. Here is the repartition : /dev/vde1 99G 89G 4.7G 96% /volumes/cassandra/data/data1 /dev/vdd1 99G 51G 44G 54% /volumes/cassandra/data/data2 /dev/vdf1 99G 57G 38G 61% /volumes/cassandra/data/data3 /dev/vdg1 99G 51G 44G 54% /volumes/cassandra/data/data4 /dev/vdh1 99G 50G 44G 54% /volumes/cassandra/data/data5 /dev/vdi1 99G 50G 44G 53% /volumes/cassandra/data/data6 /dev/vdj1 99G 77G 17G 83% /volumes/cassandra/data/data7 /dev/vdk1 99G 49G 45G 53% /volumes/cassandra/data/data8 /dev/vdl1 99G 52G 42G 56% /volumes/cassandra/data/data9 /dev/vdm1 99G 50G 45G 53% /volumes/cassandra/data/data10 /dev/vdn1 99G 47G 47G 51% /volumes/cassandra/data/data11 /dev/vdo1 99G 50G 44G 54% /volumes/cassandra/data/data12 /dev/vdp1 99G 52G 43G 55% /volumes/cassandra/data/data13 /dev/vdq1 99G 49G 45G 52% /volumes/cassandra/data/data14 /dev/vdr1 99G 50G 44G 53% /volumes/cassandra/data/data15 Do you know what could cause this, and how to even a little bit the data between the disks to avoid any disk saturation situation ? Because I noticed that when approaching 5% disk space on one disk, Cassandra performance drops. Thanks, Loïc CHANEL System Big Data engineer SoftAtHome (Lyon, France)
