Date: Thu, 7 Jun 2018 18:02:03 +0300 From: Christos Chatzaras <chris@cretaforce.gr> To: FreeBSD <freebsd-questions@freebsd.org> Subject: Toshiba disk low performance Message-ID: <DC4343C3-AC15-427E-9653-4C6A7F4E34C4@cretaforce.gr>
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I order a new dedicated server from a provider. The server has 2 Toshiba = disks and the disk peformance is very slow. I test it using mysqlcheck -Ao which optimizes the databases and also = with 10GB mysql import at 2 servers - one with the Toshiba disks and the = other with Seagate disks. During the tests gstat for the server with Toshiba disks show 3-4 times = lower disk operations / second compared to the other server. I had the same problem (same Toshiba models) in a production server (I = notice it after I put it in production) and ask the datacenter to = replace one disk with different model, I rebuild RAID-1, then replace = the second disk and I rebuild the RAID-1. And the issue resolved. It shows these disks as UDMA5 but other disks with good speed show = UDMA6. Also Linux shows these disks as UDMA5. Here is the dmesg output: ---- ada0 at ahcich1 bus 0 scbus0 target 0 lun 0 ada0: <TOSHIBA MG04ACA400E FP3B> ATA8-ACS SATA 3.x device ada0: Serial Number Z5B7K1Q4FJKA ada0: 600.000MB/s transfers (SATA 3.x, UDMA5, PIO 8192bytes) ada0: Command Queueing enabled ada0: 3815447MB (7814037168 512 byte sectors) ada1 at ahcich2 bus 0 scbus1 target 0 lun 0 ada1: <TOSHIBA MG04ACA400E FP3B> ATA8-ACS SATA 3.x device ada1: Serial Number Z5B7K1Q5FJKA ada1: 600.000MB/s transfers (SATA 3.x, UDMA5, PIO 8192bytes) ada1: Command Queueing enabled ada1: 3815447MB (7814037168 512 byte sectors) ---- What could be the problem with the Toshiba disks?
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